|
|
Struts example source code file (Generator.java)
This example Struts source code file (Generator.java) is included in the DevDaily.com
"Java Source Code
Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.
The Struts Generator.java source code
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.struts2.jasper.compiler;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Vector;
import javax.el.MethodExpression;
import javax.el.ValueExpression;
import javax.servlet.jsp.tagext.TagAttributeInfo;
import javax.servlet.jsp.tagext.TagInfo;
import javax.servlet.jsp.tagext.TagVariableInfo;
import javax.servlet.jsp.tagext.VariableInfo;
import org.apache.struts2.jasper.Constants;
import org.apache.struts2.jasper.JasperException;
import org.apache.struts2.jasper.JspCompilationContext;
import org.apache.struts2.jasper.compiler.Node.NamedAttribute;
import org.apache.struts2.jasper.runtime.JspRuntimeLibrary;
import org.apache.struts2.JSPRuntime;
import org.xml.sax.Attributes;
/**
* Generate Java source from Nodes
*
* @author Anil K. Vijendran
* @author Danno Ferrin
* @author Mandar Raje
* @author Rajiv Mordani
* @author Pierre Delisle
*
* Tomcat 4.1.x and Tomcat 5:
* @author Kin-man Chung
* @author Jan Luehe
* @author Shawn Bayern
* @author Mark Roth
* @author Denis Benoit
*
* Tomcat 6.x
* @author Jacob Hookom
* @author Remy Maucherat
*/
class Generator {
private static final Class[] OBJECT_CLASS = { Object.class };
private static final String VAR_EXPRESSIONFACTORY =
System.getProperty("org.apache.struts2.jasper.compiler.Generator.VAR_EXPRESSIONFACTORY", "_el_expressionfactory");
private static final String VAR_ANNOTATIONPROCESSOR =
System.getProperty("org.apache.struts2.jasper.compiler.Generator.VAR_ANNOTATIONPROCESSOR", "_jsp_annotationprocessor");
private ServletWriter out;
private ArrayList methodsBuffered;
private FragmentHelperClass fragmentHelperClass;
private ErrorDispatcher err;
private BeanRepository beanInfo;
private JspCompilationContext ctxt;
private boolean isPoolingEnabled;
private boolean breakAtLF;
private String jspIdPrefix;
private int jspId;
private PageInfo pageInfo;
private Vector<String> tagHandlerPoolNames;
private GenBuffer charArrayBuffer;
/**
* @param s
* the input string
* @return quoted and escaped string, per Java rule
*/
static String quote(String s) {
if (s == null)
return "null";
return '"' + escape(s) + '"';
}
/**
* @param s
* the input string
* @return escaped string, per Java rule
*/
static String escape(String s) {
if (s == null)
return "";
StringBuffer b = new StringBuffer();
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (c == '"')
b.append('\\').append('"');
else if (c == '\\')
b.append('\\').append('\\');
else if (c == '\n')
b.append('\\').append('n');
else if (c == '\r')
b.append('\\').append('r');
else
b.append(c);
}
return b.toString();
}
/**
* Single quote and escape a character
*/
static String quote(char c) {
StringBuffer b = new StringBuffer();
b.append('\'');
if (c == '\'')
b.append('\\').append('\'');
else if (c == '\\')
b.append('\\').append('\\');
else if (c == '\n')
b.append('\\').append('n');
else if (c == '\r')
b.append('\\').append('r');
else
b.append(c);
b.append('\'');
return b.toString();
}
private String createJspId() throws JasperException {
if (this.jspIdPrefix == null) {
StringBuffer sb = new StringBuffer(32);
String name = ctxt.getServletJavaFileName();
sb.append("jsp_").append(Math.abs(name.hashCode())).append('_');
this.jspIdPrefix = sb.toString();
}
return this.jspIdPrefix + (this.jspId++);
}
/**
* Generates declarations. This includes "info" of the page directive, and
* scriptlet declarations.
*/
private void generateDeclarations(Node.Nodes page) throws JasperException {
class DeclarationVisitor extends Node.Visitor {
private boolean getServletInfoGenerated = false;
/*
* Generates getServletInfo() method that returns the value of the
* page directive's 'info' attribute, if present.
*
* The Validator has already ensured that if the translation unit
* contains more than one page directive with an 'info' attribute,
* their values match.
*/
public void visit(Node.PageDirective n) throws JasperException {
if (getServletInfoGenerated) {
return;
}
String info = n.getAttributeValue("info");
if (info == null)
return;
getServletInfoGenerated = true;
out.printil("public String getServletInfo() {");
out.pushIndent();
out.printin("return ");
out.print(quote(info));
out.println(";");
out.popIndent();
out.printil("}");
out.println();
}
public void visit(Node.Declaration n) throws JasperException {
n.setBeginJavaLine(out.getJavaLine());
out.printMultiLn(new String(n.getText()));
out.println();
n.setEndJavaLine(out.getJavaLine());
}
// Custom Tags may contain declarations from tag plugins.
public void visit(Node.CustomTag n) throws JasperException {
if (n.useTagPlugin()) {
if (n.getAtSTag() != null) {
n.getAtSTag().visit(this);
}
visitBody(n);
if (n.getAtETag() != null) {
n.getAtETag().visit(this);
}
} else {
visitBody(n);
}
}
}
out.println();
page.visit(new DeclarationVisitor());
}
/**
* Compiles list of tag handler pool names.
*/
private void compileTagHandlerPoolList(Node.Nodes page)
throws JasperException {
class TagHandlerPoolVisitor extends Node.Visitor {
private Vector names;
/*
* Constructor
*
* @param v Vector of tag handler pool names to populate
*/
TagHandlerPoolVisitor(Vector v) {
names = v;
}
/*
* Gets the name of the tag handler pool for the given custom tag
* and adds it to the list of tag handler pool names unless it is
* already contained in it.
*/
public void visit(Node.CustomTag n) throws JasperException {
if (!n.implementsSimpleTag()) {
String name = createTagHandlerPoolName(n.getPrefix(), n
.getLocalName(), n.getAttributes(),
n.getNamedAttributeNodes(), n.hasEmptyBody());
n.setTagHandlerPoolName(name);
if (!names.contains(name)) {
names.add(name);
}
}
visitBody(n);
}
/*
* Creates the name of the tag handler pool whose tag handlers may
* be (re)used to service this action.
*
* @return The name of the tag handler pool
*/
private String createTagHandlerPoolName(String prefix,
String shortName, Attributes attrs, Node.Nodes namedAttrs,
boolean hasEmptyBody) {
String poolName = null;
poolName = "_jspx_tagPool_" + prefix + "_" + shortName;
if (attrs != null) {
String[] attrNames =
new String[attrs.getLength() + namedAttrs.size()];
for (int i = 0; i < attrNames.length; i++) {
attrNames[i] = attrs.getQName(i);
}
for (int i = 0; i < namedAttrs.size(); i++) {
attrNames[attrs.getLength() + i] =
((NamedAttribute) namedAttrs.getNode(i)).getQName();
}
Arrays.sort(attrNames, Collections.reverseOrder());
if (attrNames.length > 0) {
poolName = poolName + "&";
}
for (int i = 0; i < attrNames.length; i++) {
poolName = poolName + "_" + attrNames[i];
}
}
if (hasEmptyBody) {
poolName = poolName + "_nobody";
}
return JspUtil.makeJavaIdentifier(poolName);
}
}
page.visit(new TagHandlerPoolVisitor(tagHandlerPoolNames));
}
private void declareTemporaryScriptingVars(Node.Nodes page)
throws JasperException {
class ScriptingVarVisitor extends Node.Visitor {
private Vector vars;
ScriptingVarVisitor() {
vars = new Vector();
}
public void visit(Node.CustomTag n) throws JasperException {
if (n.getCustomNestingLevel() > 0) {
TagVariableInfo[] tagVarInfos = n.getTagVariableInfos();
VariableInfo[] varInfos = n.getVariableInfos();
if (varInfos.length > 0) {
for (int i = 0; i < varInfos.length; i++) {
String varName = varInfos[i].getVarName();
String tmpVarName = "_jspx_" + varName + "_"
+ n.getCustomNestingLevel();
if (!vars.contains(tmpVarName)) {
vars.add(tmpVarName);
out.printin(varInfos[i].getClassName());
out.print(" ");
out.print(tmpVarName);
out.print(" = ");
out.print(null);
out.println(";");
}
}
} else {
for (int i = 0; i < tagVarInfos.length; i++) {
String varName = tagVarInfos[i].getNameGiven();
if (varName == null) {
varName = n.getTagData().getAttributeString(
tagVarInfos[i].getNameFromAttribute());
} else if (tagVarInfos[i].getNameFromAttribute() != null) {
// alias
continue;
}
String tmpVarName = "_jspx_" + varName + "_"
+ n.getCustomNestingLevel();
if (!vars.contains(tmpVarName)) {
vars.add(tmpVarName);
out.printin(tagVarInfos[i].getClassName());
out.print(" ");
out.print(tmpVarName);
out.print(" = ");
out.print(null);
out.println(";");
}
}
}
}
visitBody(n);
}
}
page.visit(new ScriptingVarVisitor());
}
/**
* Generates the _jspInit() method for instantiating the tag handler pools.
* For tag file, _jspInit has to be invoked manually, and the ServletConfig
* object explicitly passed.
*
* In JSP 2.1, we also instantiate an ExpressionFactory
*/
private void generateInit() {
if (ctxt.isTagFile()) {
out.printil("private void _jspInit(ServletConfig config) {");
} else {
out.printil("public void _jspInit() {");
}
out.pushIndent();
if (isPoolingEnabled) {
for (int i = 0; i < tagHandlerPoolNames.size(); i++) {
out.printin(tagHandlerPoolNames.elementAt(i));
out.print(" = org.apache.struts2.jasper.runtime.TagHandlerPool.getTagHandlerPool(");
if (ctxt.isTagFile()) {
out.print("config");
} else {
out.print("getServletConfig()");
}
out.println(");");
}
}
out.printin(VAR_EXPRESSIONFACTORY);
out.print(" = _jspxFactory.getJspApplicationContext(");
if (ctxt.isTagFile()) {
out.print("config");
} else {
out.print("getServletConfig()");
}
out.println(".getServletContext()).getExpressionFactory();");
out.printin(VAR_ANNOTATIONPROCESSOR);
out.print(" = (org.apache.AnnotationProcessor) ");
if (ctxt.isTagFile()) {
out.print("config");
} else {
out.print("getServletConfig()");
}
out.println(".getServletContext().getAttribute(org.apache.AnnotationProcessor.class.getName());");
out.popIndent();
out.printil("}");
out.println();
}
/**
* Generates the _jspDestroy() method which is responsible for calling the
* release() method on every tag handler in any of the tag handler pools.
*/
private void generateDestroy() {
out.printil("public void _jspDestroy() {");
out.pushIndent();
if (isPoolingEnabled) {
for (int i = 0; i < tagHandlerPoolNames.size(); i++) {
out.printin((String) tagHandlerPoolNames.elementAt(i));
out.println(".release();");
}
}
out.popIndent();
out.printil("}");
out.println();
}
/**
* Generate preamble package name (shared by servlet and tag handler
* preamble generation)
*/
private void genPreamblePackage(String packageName) throws JasperException {
if (!"".equals(packageName) && packageName != null) {
out.printil("package " + packageName + ";");
out.println();
}
}
/**
* Generate preamble imports (shared by servlet and tag handler preamble
* generation)
*/
private void genPreambleImports() throws JasperException {
Iterator iter = pageInfo.getImports().iterator();
while (iter.hasNext()) {
out.printin("import ");
out.print((String) iter.next());
out.println(";");
}
out.println();
}
/**
* Generation of static initializers in preamble. For example, dependant
* list, el function map, prefix map. (shared by servlet and tag handler
* preamble generation)
*/
private void genPreambleStaticInitializers() throws JasperException {
out.printil("private static final JspFactory _jspxFactory = JspFactory.getDefaultFactory();");
out.println();
// Static data for getDependants()
out.printil("private static java.util.List _jspx_dependants;");
out.println();
List dependants = pageInfo.getDependants();
Iterator iter = dependants.iterator();
if (!dependants.isEmpty()) {
out.printil("static {");
out.pushIndent();
out.printin("_jspx_dependants = new java.util.ArrayList(");
out.print("" + dependants.size());
out.println(");");
while (iter.hasNext()) {
out.printin("_jspx_dependants.add(\"");
out.print((String) iter.next());
out.println("\");");
}
out.popIndent();
out.printil("}");
out.println();
}
}
/**
* Declare tag handler pools (tags of the same type and with the same
* attribute set share the same tag handler pool) (shared by servlet and tag
* handler preamble generation)
*
* In JSP 2.1, we also scope an instance of ExpressionFactory
*/
private void genPreambleClassVariableDeclarations(String className)
throws JasperException {
if (isPoolingEnabled && !tagHandlerPoolNames.isEmpty()) {
for (int i = 0; i < tagHandlerPoolNames.size(); i++) {
out.printil("private org.apache.struts2.jasper.runtime.TagHandlerPool "
+ tagHandlerPoolNames.elementAt(i) + ";");
}
out.println();
}
out.printin("private javax.el.ExpressionFactory ");
out.print(VAR_EXPRESSIONFACTORY);
out.println(";");
out.printin("private org.apache.AnnotationProcessor ");
out.print(VAR_ANNOTATIONPROCESSOR);
out.println(";");
out.println();
}
/**
* Declare general-purpose methods (shared by servlet and tag handler
* preamble generation)
*/
private void genPreambleMethods() throws JasperException {
// Method used to get compile time file dependencies
out.printil("public Object getDependants() {");
out.pushIndent();
out.printil("return _jspx_dependants;");
out.popIndent();
out.printil("}");
out.println();
generateInit();
generateDestroy();
}
/**
* Generates the beginning of the static portion of the servlet.
*/
private void generatePreamble(Node.Nodes page) throws JasperException {
String servletPackageName = ctxt.getServletPackageName();
String servletClassName = ctxt.getServletClassName();
String serviceMethodName = Constants.SERVICE_METHOD_NAME;
// First the package name:
genPreamblePackage(servletPackageName);
// Generate imports
genPreambleImports();
// Generate class declaration
out.printin("public final class ");
out.print(servletClassName);
out.print(" extends ");
out.println(pageInfo.getExtends());
out.printin(" implements org.apache.struts2.jasper.runtime.JspSourceDependent");
if (!pageInfo.isThreadSafe()) {
out.println(",");
out.printin(" SingleThreadModel");
}
out.println(" {");
out.pushIndent();
// Class body begins here
generateDeclarations(page);
// Static initializations here
genPreambleStaticInitializers();
// Class variable declarations
genPreambleClassVariableDeclarations(servletClassName);
// Constructor
// generateConstructor(className);
// Methods here
genPreambleMethods();
// Now the service method
out.printin("public void ");
out.print(serviceMethodName);
out.println("(HttpServletRequest request, HttpServletResponse response)");
out.println(" throws java.io.IOException, ServletException {");
out.pushIndent();
out.println();
// Local variable declarations
out.printil("PageContext pageContext = null;");
if (pageInfo.isSession())
out.printil("HttpSession session = null;");
if (pageInfo.isErrorPage()) {
out.printil("Throwable exception = org.apache.struts2.jasper.runtime.JspRuntimeLibrary.getThrowable(request);");
out.printil("if (exception != null) {");
out.pushIndent();
out.printil("response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);");
out.popIndent();
out.printil("}");
}
out.printil("ServletContext application = null;");
out.printil("ServletConfig config = null;");
out.printil("JspWriter out = null;");
out.printil("Object page = this;");
out.printil("JspWriter _jspx_out = null;");
out.printil("PageContext _jspx_page_context = null;");
out.println();
declareTemporaryScriptingVars(page);
out.println();
out.printil("try {");
out.pushIndent();
out.printin("response.setContentType(");
out.print(quote(pageInfo.getContentType()));
out.println(");");
if (ctxt.getOptions().isXpoweredBy()) {
out.printil("response.addHeader(\"X-Powered-By\", \"JSP/2.1\");");
}
out
.printil("pageContext = _jspxFactory.getPageContext(this, request, response,");
out.printin("\t\t\t");
out.print(quote(pageInfo.getErrorPage()));
out.print(", " + pageInfo.isSession());
out.print(", " + pageInfo.getBuffer());
out.print(", " + pageInfo.isAutoFlush());
out.println(");");
out.printil("_jspx_page_context = pageContext;");
out.printil("application = pageContext.getServletContext();");
out.printil("config = pageContext.getServletConfig();");
if (pageInfo.isSession())
out.printil("session = pageContext.getSession();");
out.printil("out = pageContext.getOut();");
out.printil("_jspx_out = out;");
out.println();
}
/**
* Generates an XML Prolog, which includes an XML declaration and an XML
* doctype declaration.
*/
private void generateXmlProlog(Node.Nodes page) {
/*
* An XML declaration is generated under the following conditions: -
* 'omit-xml-declaration' attribute of <jsp:output> action is set to
* "no" or "false" - JSP document without a <jsp:root>
*/
String omitXmlDecl = pageInfo.getOmitXmlDecl();
if ((omitXmlDecl != null && !JspUtil.booleanValue(omitXmlDecl))
|| (omitXmlDecl == null && page.getRoot().isXmlSyntax()
&& !pageInfo.hasJspRoot() && !ctxt.isTagFile())) {
String cType = pageInfo.getContentType();
String charSet = cType.substring(cType.indexOf("charset=") + 8);
out.printil("out.write(\"<?xml version=\\\"1.0\\\" encoding=\\\""
+ charSet + "\\\"?>\\n\");");
}
/*
* Output a DOCTYPE declaration if the doctype-root-element appears. If
* doctype-public appears: <!DOCTYPE name PUBLIC "doctypePublic"
* "doctypeSystem"> else <!DOCTYPE name SYSTEM "doctypeSystem" >
*/
String doctypeName = pageInfo.getDoctypeName();
if (doctypeName != null) {
String doctypePublic = pageInfo.getDoctypePublic();
String doctypeSystem = pageInfo.getDoctypeSystem();
out.printin("out.write(\"<!DOCTYPE ");
out.print(doctypeName);
if (doctypePublic == null) {
out.print(" SYSTEM \\\"");
} else {
out.print(" PUBLIC \\\"");
out.print(doctypePublic);
out.print("\\\" \\\"");
}
out.print(doctypeSystem);
out.println("\\\">\\n\");");
}
}
/*
* Generates the constructor. (shared by servlet and tag handler preamble
* generation)
*/
private void generateConstructor(String className) {
out.printil("public " + className + "() {");
out.printil("}");
out.println();
}
/**
* A visitor that generates codes for the elements in the page.
*/
class GenerateVisitor extends Node.Visitor {
/*
* Hashtable containing introspection information on tag handlers:
* <key>: tag prefix : hashtable containing introspection on tag
* handlers: <key>: tag short name : introspection info of tag
* handler for <prefix:shortName> tag
*/
private Hashtable handlerInfos;
private Hashtable tagVarNumbers;
private String parent;
private boolean isSimpleTagParent; // Is parent a SimpleTag?
private String pushBodyCountVar;
private String simpleTagHandlerVar;
private boolean isSimpleTagHandler;
private boolean isFragment;
private boolean isTagFile;
private ServletWriter out;
private ArrayList methodsBuffered;
private FragmentHelperClass fragmentHelperClass;
private int methodNesting;
private TagInfo tagInfo;
private ClassLoader loader;
private int charArrayCount;
private HashMap textMap;
/**
* Constructor.
*/
public GenerateVisitor(boolean isTagFile, ServletWriter out,
ArrayList methodsBuffered,
FragmentHelperClass fragmentHelperClass, ClassLoader loader,
TagInfo tagInfo) {
this.isTagFile = isTagFile;
this.out = out;
this.methodsBuffered = methodsBuffered;
this.fragmentHelperClass = fragmentHelperClass;
this.loader = loader;
this.tagInfo = tagInfo;
methodNesting = 0;
handlerInfos = new Hashtable();
tagVarNumbers = new Hashtable();
textMap = new HashMap();
}
/**
* Returns an attribute value, optionally URL encoded. If the value is a
* runtime expression, the result is the expression itself, as a string.
* If the result is an EL expression, we insert a call to the
* interpreter. If the result is a Named Attribute we insert the
* generated variable name. Otherwise the result is a string literal,
* quoted and escaped.
*
* @param attr
* An JspAttribute object
* @param encode
* true if to be URL encoded
* @param expectedType
* the expected type for an EL evaluation (ignored for
* attributes that aren't EL expressions)
*/
private String attributeValue(Node.JspAttribute attr, boolean encode,
Class expectedType) {
String v = attr.getValue();
if (!attr.isNamedAttribute() && (v == null))
return "";
if (attr.isExpression()) {
if (encode) {
return "org.apache.struts2.jasper.runtime.JspRuntimeLibrary.URLEncode(String.valueOf("
+ v + "), request.getCharacterEncoding())";
}
return v;
} else if (attr.isELInterpreterInput()) {
v = attributeValueWithEL(this.isTagFile, v, expectedType,
attr.getEL().getMapName());
if (encode) {
return "org.apache.struts2.jasper.runtime.JspRuntimeLibrary.URLEncode("
+ v + ", request.getCharacterEncoding())";
}
return v;
} else if (attr.isNamedAttribute()) {
return attr.getNamedAttributeNode().getTemporaryVariableName();
} else {
if (encode) {
return "org.apache.struts2.jasper.runtime.JspRuntimeLibrary.URLEncode("
+ quote(v) + ", request.getCharacterEncoding())";
}
return quote(v);
}
}
/*
* When interpreting the EL attribute value, literals outside the EL
* must not be unescaped but the EL processor will unescape them.
* Therefore, make sure only the EL expressions are processed by the EL
* processor.
*/
private String attributeValueWithEL(boolean isTag, String tx,
Class<?> expectedType, String mapName) {
if (tx==null) return null;
Class<?> type = expectedType;
int size = tx.length();
StringBuffer output = new StringBuffer(size);
boolean el = false;
int i = 0;
int mark = 0;
char ch;
while(i < size){
ch = tx.charAt(i);
// Start of an EL expression
if (!el && i+1 < size && ch == '$' && tx.charAt(i+1)=='{') {
if (mark < i) {
if (output.length() > 0) {
output.append(" + ");
// Composite expression - must coerce to String
type = String.class;
}
output.append(quote(tx.substring(mark, i)));
}
mark = i;
el = true;
i += 2;
} else if (ch=='\\' && i+1 < size &&
(tx.charAt(i+1)=='$' || tx.charAt(i+1)=='}')) {
// Skip an escaped $ or }
i += 2;
} else if (el && ch=='}') {
// End of an EL expression
if (output.length() > 0) {
output.append(" + ");
// Composite expression - must coerce to String
type = String.class;
}
output.append(
JspUtil.interpreterCall(isTag,
tx.substring(mark, i+1), type,
mapName, false));
mark = i + 1;
el = false;
++i;
} else {
// Nothing to see here - move to next character
++i;
}
}
if (!el && mark < i) {
if (output.length() > 0) {
output.append(" + ");
}
output.append(quote(tx.substring(mark, i)));
}
return output.toString();
}
/**
* Prints the attribute value specified in the param action, in the form
* of name=value string.
*
* @param n
* the parent node for the param action nodes.
*/
private void printParams(Node n, String pageParam, boolean literal)
throws JasperException {
class ParamVisitor extends Node.Visitor {
String separator;
ParamVisitor(String separator) {
this.separator = separator;
}
public void visit(Node.ParamAction n) throws JasperException {
out.print(" + ");
out.print(separator);
out.print(" + ");
out.print("org.apache.struts2.jasper.runtime.JspRuntimeLibrary."
+ "URLEncode(" + quote(n.getTextAttribute("name"))
+ ", request.getCharacterEncoding())");
out.print("+ \"=\" + ");
out.print(attributeValue(n.getValue(), true, String.class));
// The separator is '&' after the second use
separator = "\"&\"";
}
}
String sep;
if (literal) {
sep = pageParam.indexOf('?') > 0 ? "\"&\"" : "\"?\"";
} else {
sep = "((" + pageParam + ").indexOf('?')>0? '&': '?')";
}
if (n.getBody() != null) {
n.getBody().visit(new ParamVisitor(sep));
}
}
public void visit(Node.Expression n) throws JasperException {
n.setBeginJavaLine(out.getJavaLine());
out.printin("out.print(");
out.printMultiLn(n.getText());
out.println(");");
n.setEndJavaLine(out.getJavaLine());
}
public void visit(Node.Scriptlet n) throws JasperException {
n.setBeginJavaLine(out.getJavaLine());
out.printMultiLn(n.getText());
out.println();
n.setEndJavaLine(out.getJavaLine());
}
public void visit(Node.ELExpression n) throws JasperException {
n.setBeginJavaLine(out.getJavaLine());
if (!pageInfo.isELIgnored() && (n.getEL() != null)) {
out.printil("out.write("
+ JspUtil.interpreterCall(this.isTagFile, n.getType() + "{"
+ new String(n.getText()) + "}", String.class,
n.getEL().getMapName(), false) + ");");
} else {
out.printil("out.write("
+ quote(n.getType() + "{" + new String(n.getText()) + "}") + ");");
}
n.setEndJavaLine(out.getJavaLine());
}
public void visit(Node.IncludeAction n) throws JasperException {
String flush = n.getTextAttribute("flush");
Node.JspAttribute page = n.getPage();
boolean isFlush = false; // default to false;
if ("true".equals(flush))
isFlush = true;
n.setBeginJavaLine(out.getJavaLine());
String pageParam;
if (page.isNamedAttribute()) {
// If the page for jsp:include was specified via
// jsp:attribute, first generate code to evaluate
// that body.
pageParam = generateNamedAttributeValue(page
.getNamedAttributeNode());
} else {
pageParam = attributeValue(page, false, String.class);
}
// If any of the params have their values specified by
// jsp:attribute, prepare those values first.
Node jspBody = findJspBody(n);
if (jspBody != null) {
prepareParams(jspBody);
} else {
prepareParams(n);
}
out.printin(
JSPRuntime.class.getName() + ".handle("
+ pageParam);
printParams(n, pageParam, page.isLiteral());
out.println(", " + isFlush + ");");
n.setEndJavaLine(out.getJavaLine());
}
/**
* Scans through all child nodes of the given parent for <param>
* subelements. For each <param> element, if its value is specified via
* a Named Attribute (<jsp:attribute>), generate the code to evaluate
* those bodies first.
* <p>
* If parent is null, simply returns.
*/
private void prepareParams(Node parent) throws JasperException {
if (parent == null)
return;
Node.Nodes subelements = parent.getBody();
if (subelements != null) {
for (int i = 0; i < subelements.size(); i++) {
Node n = subelements.getNode(i);
if (n instanceof Node.ParamAction) {
Node.Nodes paramSubElements = n.getBody();
for (int j = 0; (paramSubElements != null)
&& (j < paramSubElements.size()); j++) {
Node m = paramSubElements.getNode(j);
if (m instanceof Node.NamedAttribute) {
generateNamedAttributeValue((Node.NamedAttribute) m);
}
}
}
}
}
}
/**
* Finds the <jsp:body> subelement of the given parent node. If not
* found, null is returned.
*/
private Node.JspBody findJspBody(Node parent) throws JasperException {
Node.JspBody result = null;
Node.Nodes subelements = parent.getBody();
for (int i = 0; (subelements != null) && (i < subelements.size()); i++) {
Node n = subelements.getNode(i);
if (n instanceof Node.JspBody) {
result = (Node.JspBody) n;
break;
}
}
return result;
}
public void visit(Node.ForwardAction n) throws JasperException {
Node.JspAttribute page = n.getPage();
n.setBeginJavaLine(out.getJavaLine());
out.printil("if (true) {"); // So that javac won't complain about
out.pushIndent(); // codes after "return"
String pageParam;
if (page.isNamedAttribute()) {
// If the page for jsp:forward was specified via
// jsp:attribute, first generate code to evaluate
// that body.
pageParam = generateNamedAttributeValue(page
.getNamedAttributeNode());
} else {
pageParam = attributeValue(page, false, String.class);
}
// If any of the params have their values specified by
// jsp:attribute, prepare those values first.
Node jspBody = findJspBody(n);
if (jspBody != null) {
prepareParams(jspBody);
} else {
prepareParams(n);
}
out.printin("_jspx_page_context.forward(");
out.print(pageParam);
printParams(n, pageParam, page.isLiteral());
out.println(");");
if (isTagFile || isFragment) {
out.printil("throw new SkipPageException();");
} else {
out.printil((methodNesting > 0) ? "return true;" : "return;");
}
out.popIndent();
out.printil("}");
n.setEndJavaLine(out.getJavaLine());
// XXX Not sure if we can eliminate dead codes after this.
}
public void visit(Node.GetProperty n) throws JasperException {
String name = n.getTextAttribute("name");
String property = n.getTextAttribute("property");
n.setBeginJavaLine(out.getJavaLine());
if (beanInfo.checkVariable(name)) {
// Bean is defined using useBean, introspect at compile time
Class bean = beanInfo.getBeanType(name);
String beanName = JspUtil.getCanonicalName(bean);
java.lang.reflect.Method meth = JspRuntimeLibrary
.getReadMethod(bean, property);
String methodName = meth.getName();
out
.printil("out.write(org.apache.struts2.jasper.runtime.JspRuntimeLibrary.toString("
+ "((("
+ beanName
+ ")_jspx_page_context.findAttribute("
+ "\""
+ name + "\"))." + methodName + "())));");
} else {
// The object could be a custom action with an associated
// VariableInfo entry for this name.
// Get the class name and then introspect at runtime.
out
.printil("out.write(org.apache.struts2.jasper.runtime.JspRuntimeLibrary.toString"
+ "(org.apache.struts2.jasper.runtime.JspRuntimeLibrary.handleGetProperty"
+ "(_jspx_page_context.getAttribute(\""
+ name
+ "\", PageContext.PAGE_SCOPE), \""
+ property
+ "\")));");
}
n.setEndJavaLine(out.getJavaLine());
}
public void visit(Node.SetProperty n) throws JasperException {
String name = n.getTextAttribute("name");
String property = n.getTextAttribute("property");
String param = n.getTextAttribute("param");
Node.JspAttribute value = n.getValue();
n.setBeginJavaLine(out.getJavaLine());
if ("*".equals(property)) {
out
.printil("org.apache.struts2.jasper.runtime.JspRuntimeLibrary.introspect("
+ "_jspx_page_context.findAttribute("
+ "\""
+ name + "\"), request);");
} else if (value == null) {
if (param == null)
param = property; // default to same as property
out
.printil("org.apache.struts2.jasper.runtime.JspRuntimeLibrary.introspecthelper("
+ "_jspx_page_context.findAttribute(\""
+ name
+ "\"), \""
+ property
+ "\", request.getParameter(\""
+ param
+ "\"), "
+ "request, \""
+ param
+ "\", false);");
} else if (value.isExpression()) {
out
.printil("org.apache.struts2.jasper.runtime.JspRuntimeLibrary.handleSetProperty("
+ "_jspx_page_context.findAttribute(\""
+ name
+ "\"), \"" + property + "\",");
out.print(attributeValue(value, false, null));
out.println(");");
} else if (value.isELInterpreterInput()) {
// We've got to resolve the very call to the interpreter
// at runtime since we don't know what type to expect
// in the general case; we thus can't hard-wire the call
// into the generated code. (XXX We could, however,
// optimize the case where the bean is exposed with
// <jsp:useBean>, much as the code here does for
// getProperty.)
// The following holds true for the arguments passed to
// JspRuntimeLibrary.handleSetPropertyExpression():
// - 'pageContext' is a VariableResolver.
// - 'this' (either the generated Servlet or the generated tag
// handler for Tag files) is a FunctionMapper.
out
.printil("org.apache.struts2.jasper.runtime.JspRuntimeLibrary.handleSetPropertyExpression("
+ "_jspx_page_context.findAttribute(\""
+ name
+ "\"), \""
+ property
+ "\", "
+ quote(value.getValue())
+ ", "
+ "_jspx_page_context, "
+ value.getEL().getMapName() + ");");
} else if (value.isNamedAttribute()) {
// If the value for setProperty was specified via
// jsp:attribute, first generate code to evaluate
// that body.
String valueVarName = generateNamedAttributeValue(value
.getNamedAttributeNode());
out
.printil("org.apache.struts2.jasper.runtime.JspRuntimeLibrary.introspecthelper("
+ "_jspx_page_context.findAttribute(\""
+ name
+ "\"), \""
+ property
+ "\", "
+ valueVarName
+ ", null, null, false);");
} else {
out
.printin("org.apache.struts2.jasper.runtime.JspRuntimeLibrary.introspecthelper("
+ "_jspx_page_context.findAttribute(\""
+ name
+ "\"), \"" + property + "\", ");
out.print(attributeValue(value, false, null));
out.println(", null, null, false);");
}
n.setEndJavaLine(out.getJavaLine());
}
public void visit(Node.UseBean n) throws JasperException {
String name = n.getTextAttribute("id");
String scope = n.getTextAttribute("scope");
String klass = n.getTextAttribute("class");
String type = n.getTextAttribute("type");
Node.JspAttribute beanName = n.getBeanName();
// If "class" is specified, try an instantiation at compile time
boolean generateNew = false;
String canonicalName = null; // Canonical name for klass
if (klass != null) {
try {
Class bean = ctxt.getClassLoader().loadClass(klass);
if (klass.indexOf('$') >= 0) {
// Obtain the canonical type name
canonicalName = JspUtil.getCanonicalName(bean);
} else {
canonicalName = klass;
}
int modifiers = bean.getModifiers();
if (!Modifier.isPublic(modifiers)
|| Modifier.isInterface(modifiers)
|| Modifier.isAbstract(modifiers)) {
throw new Exception("Invalid bean class modifier");
}
// Check that there is a 0 arg constructor
bean.getConstructor(new Class[] {});
// At compile time, we have determined that the bean class
// exists, with a public zero constructor, new() can be
// used for bean instantiation.
generateNew = true;
} catch (Exception e) {
// Cannot instantiate the specified class, either a
// compilation error or a runtime error will be raised,
// depending on a compiler flag.
if (ctxt.getOptions()
.getErrorOnUseBeanInvalidClassAttribute()) {
err.jspError(n, "jsp.error.invalid.bean", klass);
}
if (canonicalName == null) {
// Doing our best here to get a canonical name
// from the binary name, should work 99.99% of time.
canonicalName = klass.replace('$', '.');
}
}
if (type == null) {
// if type is unspecified, use "class" as type of bean
type = canonicalName;
}
}
String scopename = "PageContext.PAGE_SCOPE"; // Default to page
String lock = "_jspx_page_context";
if ("request".equals(scope)) {
scopename = "PageContext.REQUEST_SCOPE";
lock = "request";
} else if ("session".equals(scope)) {
scopename = "PageContext.SESSION_SCOPE";
lock = "session";
} else if ("application".equals(scope)) {
scopename = "PageContext.APPLICATION_SCOPE";
lock = "application";
}
n.setBeginJavaLine(out.getJavaLine());
// Declare bean
out.printin(type);
out.print(' ');
out.print(name);
out.println(" = null;");
// Lock while getting or creating bean
out.printin("synchronized (");
out.print(lock);
out.println(") {");
out.pushIndent();
// Locate bean from context
out.printin(name);
out.print(" = (");
out.print(type);
out.print(") _jspx_page_context.getAttribute(");
out.print(quote(name));
out.print(", ");
out.print(scopename);
out.println(");");
// Create bean
/*
* Check if bean is alredy there
*/
out.printin("if (");
out.print(name);
out.println(" == null){");
out.pushIndent();
if (klass == null && beanName == null) {
/*
* If both class name and beanName is not specified, the bean
* must be found locally, otherwise it's an error
*/
out
.printin("throw new java.lang.InstantiationException(\"bean ");
out.print(name);
out.println(" not found within scope\");");
} else {
/*
* Instantiate the bean if it is not in the specified scope.
*/
if (!generateNew) {
String binaryName;
if (beanName != null) {
if (beanName.isNamedAttribute()) {
// If the value for beanName was specified via
// jsp:attribute, first generate code to evaluate
// that body.
binaryName = generateNamedAttributeValue(beanName
.getNamedAttributeNode());
} else {
binaryName = attributeValue(beanName, false,
String.class);
}
} else {
// Implies klass is not null
binaryName = quote(klass);
}
out.printil("try {");
out.pushIndent();
out.printin(name);
out.print(" = (");
out.print(type);
out.print(") java.beans.Beans.instantiate(");
out.print("this.getClass().getClassLoader(), ");
out.print(binaryName);
out.println(");");
out.popIndent();
/*
* Note: Beans.instantiate throws ClassNotFoundException if
* the bean class is abstract.
*/
out.printil("} catch (ClassNotFoundException exc) {");
out.pushIndent();
out
.printil("throw new InstantiationException(exc.getMessage());");
out.popIndent();
out.printil("} catch (Exception exc) {");
out.pushIndent();
out.printin("throw new ServletException(");
out.print("\"Cannot create bean of class \" + ");
out.print(binaryName);
out.println(", exc);");
out.popIndent();
out.printil("}"); // close of try
} else {
// Implies klass is not null
// Generate codes to instantiate the bean class
out.printin(name);
out.print(" = new ");
out.print(canonicalName);
out.println("();");
}
/*
* Set attribute for bean in the specified scope
*/
out.printin("_jspx_page_context.setAttribute(");
out.print(quote(name));
out.print(", ");
out.print(name);
out.print(", ");
out.print(scopename);
out.println(");");
// Only visit the body when bean is instantiated
visitBody(n);
}
out.popIndent();
out.printil("}");
// End of lock block
out.popIndent();
out.printil("}");
n.setEndJavaLine(out.getJavaLine());
}
/**
* @return a string for the form 'attr = "value"'
*/
private String makeAttr(String attr, String value) {
if (value == null)
return "";
return " " + attr + "=\"" + value + '\"';
}
public void visit(Node.PlugIn n) throws JasperException {
/**
* A visitor to handle <jsp:param> in a plugin
*/
class ParamVisitor extends Node.Visitor {
private boolean ie;
ParamVisitor(boolean ie) {
this.ie = ie;
}
public void visit(Node.ParamAction n) throws JasperException {
String name = n.getTextAttribute("name");
if (name.equalsIgnoreCase("object"))
name = "java_object";
else if (name.equalsIgnoreCase("type"))
name = "java_type";
n.setBeginJavaLine(out.getJavaLine());
// XXX - Fixed a bug here - value used to be output
// inline, which is only okay if value is not an EL
// expression. Also, key/value pairs for the
// embed tag were not being generated correctly.
// Double check that this is now the correct behavior.
if (ie) {
// We want something of the form
// out.println( "<param name=\"blah\"
// value=\"" + ... + "\">" );
out.printil("out.write( \"<param name=\\\""
+ escape(name)
+ "\\\" value=\\\"\" + "
+ attributeValue(n.getValue(), false,
String.class) + " + \"\\\">\" );");
out.printil("out.write(\"\\n\");");
} else {
// We want something of the form
// out.print( " blah=\"" + ... + "\"" );
out.printil("out.write( \" "
+ escape(name)
+ "=\\\"\" + "
+ attributeValue(n.getValue(), false,
String.class) + " + \"\\\"\" );");
}
n.setEndJavaLine(out.getJavaLine());
}
}
String type = n.getTextAttribute("type");
String code = n.getTextAttribute("code");
String name = n.getTextAttribute("name");
Node.JspAttribute height = n.getHeight();
Node.JspAttribute width = n.getWidth();
String hspace = n.getTextAttribute("hspace");
String vspace = n.getTextAttribute("vspace");
String align = n.getTextAttribute("align");
String iepluginurl = n.getTextAttribute("iepluginurl");
String nspluginurl = n.getTextAttribute("nspluginurl");
String codebase = n.getTextAttribute("codebase");
String archive = n.getTextAttribute("archive");
String jreversion = n.getTextAttribute("jreversion");
String widthStr = null;
if (width != null) {
if (width.isNamedAttribute()) {
widthStr = generateNamedAttributeValue(width
.getNamedAttributeNode());
} else {
widthStr = attributeValue(width, false, String.class);
}
}
String heightStr = null;
if (height != null) {
if (height.isNamedAttribute()) {
heightStr = generateNamedAttributeValue(height
.getNamedAttributeNode());
} else {
heightStr = attributeValue(height, false, String.class);
}
}
if (iepluginurl == null)
iepluginurl = Constants.IE_PLUGIN_URL;
if (nspluginurl == null)
nspluginurl = Constants.NS_PLUGIN_URL;
n.setBeginJavaLine(out.getJavaLine());
// If any of the params have their values specified by
// jsp:attribute, prepare those values first.
// Look for a params node and prepare its param subelements:
Node.JspBody jspBody = findJspBody(n);
if (jspBody != null) {
Node.Nodes subelements = jspBody.getBody();
if (subelements != null) {
for (int i = 0; i < subelements.size(); i++) {
Node m = subelements.getNode(i);
if (m instanceof Node.ParamsAction) {
prepareParams(m);
break;
}
}
}
}
// XXX - Fixed a bug here - width and height can be set
// dynamically. Double-check if this generation is correct.
// IE style plugin
// <object ...>
// First compose the runtime output string
String s0 = "<object"
+ makeAttr("classid", ctxt.getOptions().getIeClassId())
+ makeAttr("name", name);
String s1 = "";
if (width != null) {
s1 = " + \" width=\\\"\" + " + widthStr + " + \"\\\"\"";
}
String s2 = "";
if (height != null) {
s2 = " + \" height=\\\"\" + " + heightStr + " + \"\\\"\"";
}
String s3 = makeAttr("hspace", hspace) + makeAttr("vspace", vspace)
+ makeAttr("align", align)
+ makeAttr("codebase", iepluginurl) + '>';
// Then print the output string to the java file
out.printil("out.write(" + quote(s0) + s1 + s2 + " + " + quote(s3)
+ ");");
out.printil("out.write(\"\\n\");");
// <param > for java_code
s0 = "<param name=\"java_code\"" + makeAttr("value", code) + '>';
out.printil("out.write(" + quote(s0) + ");");
out.printil("out.write(\"\\n\");");
// <param > for java_codebase
if (codebase != null) {
s0 = "<param name=\"java_codebase\""
+ makeAttr("value", codebase) + '>';
out.printil("out.write(" + quote(s0) + ");");
out.printil("out.write(\"\\n\");");
}
// <param > for java_archive
if (archive != null) {
s0 = "<param name=\"java_archive\""
+ makeAttr("value", archive) + '>';
out.printil("out.write(" + quote(s0) + ");");
out.printil("out.write(\"\\n\");");
}
// <param > for type
s0 = "<param name=\"type\""
+ makeAttr("value", "application/x-java-"
+ type
+ ((jreversion == null) ? "" : ";version="
+ jreversion)) + '>';
out.printil("out.write(" + quote(s0) + ");");
out.printil("out.write(\"\\n\");");
/*
* generate a <param> for each in the plugin body
*/
if (n.getBody() != null)
n.getBody().visit(new ParamVisitor(true));
/*
* Netscape style plugin part
*/
out.printil("out.write(" + quote("<comment>") + ");");
out.printil("out.write(\"\\n\");");
s0 = "<EMBED"
+ makeAttr("type", "application/x-java-"
+ type
+ ((jreversion == null) ? "" : ";version="
+ jreversion)) + makeAttr("name", name);
// s1 and s2 are the same as before.
s3 = makeAttr("hspace", hspace) + makeAttr("vspace", vspace)
+ makeAttr("align", align)
+ makeAttr("pluginspage", nspluginurl)
+ makeAttr("java_code", code)
+ makeAttr("java_codebase", codebase)
+ makeAttr("java_archive", archive);
out.printil("out.write(" + quote(s0) + s1 + s2 + " + " + quote(s3)
+ ");");
/*
* Generate a 'attr = "value"' for each <jsp:param> in plugin body
*/
if (n.getBody() != null)
n.getBody().visit(new ParamVisitor(false));
out.printil("out.write(" + quote("/>") + ");");
out.printil("out.write(\"\\n\");");
out.printil("out.write(" + quote("<noembed>") + ");");
out.printil("out.write(\"\\n\");");
/*
* Fallback
*/
if (n.getBody() != null) {
visitBody(n);
out.printil("out.write(\"\\n\");");
}
out.printil("out.write(" + quote("</noembed>") + ");");
out.printil("out.write(\"\\n\");");
out.printil("out.write(" + quote("</comment>") + ");");
out.printil("out.write(\"\\n\");");
out.printil("out.write(" + quote("</object>") + ");");
out.printil("out.write(\"\\n\");");
n.setEndJavaLine(out.getJavaLine());
}
public void visit(Node.NamedAttribute n) throws JasperException {
// Don't visit body of this tag - we already did earlier.
}
public void visit(Node.CustomTag n) throws JasperException {
// Use plugin to generate more efficient code if there is one.
if (n.useTagPlugin()) {
generateTagPlugin(n);
return;
}
TagHandlerInfo handlerInfo = getTagHandlerInfo(n);
// Create variable names
String baseVar = createTagVarName(n.getQName(), n.getPrefix(), n
.getLocalName());
String tagEvalVar = "_jspx_eval_" + baseVar;
String tagHandlerVar = "_jspx_th_" + baseVar;
String tagPushBodyCountVar = "_jspx_push_body_count_" + baseVar;
// If the tag contains no scripting element, generate its codes
// to a method.
ServletWriter outSave = null;
Node.ChildInfo ci = n.getChildInfo();
if (ci.isScriptless() && !ci.hasScriptingVars()) {
// The tag handler and its body code can reside in a separate
// method if it is scriptless and does not have any scripting
// variable defined.
String tagMethod = "_jspx_meth_" + baseVar;
// Generate a call to this method
out.printin("if (");
out.print(tagMethod);
out.print("(");
if (parent != null) {
out.print(parent);
out.print(", ");
}
out.print("_jspx_page_context");
if (pushBodyCountVar != null) {
out.print(", ");
out.print(pushBodyCountVar);
}
out.println("))");
out.pushIndent();
out.printil((methodNesting > 0) ? "return true;" : "return;");
out.popIndent();
// Set up new buffer for the method
outSave = out;
/*
* For fragments, their bodies will be generated in fragment
* helper classes, and the Java line adjustments will be done
* there, hence they are set to null here to avoid double
* adjustments.
*/
GenBuffer genBuffer = new GenBuffer(n,
n.implementsSimpleTag() ? null : n.getBody());
methodsBuffered.add(genBuffer);
out = genBuffer.getOut();
methodNesting++;
// Generate code for method declaration
out.println();
out.pushIndent();
out.printin("private boolean ");
out.print(tagMethod);
out.print("(");
if (parent != null) {
out.print("javax.servlet.jsp.tagext.JspTag ");
out.print(parent);
out.print(", ");
}
out.print("PageContext _jspx_page_context");
if (pushBodyCountVar != null) {
out.print(", int[] ");
out.print(pushBodyCountVar);
}
out.println(")");
out.printil(" throws Throwable {");
out.pushIndent();
// Initilaize local variables used in this method.
if (!isTagFile) {
out
.printil("PageContext pageContext = _jspx_page_context;");
}
out.printil("JspWriter out = _jspx_page_context.getOut();");
generateLocalVariables(out, n);
}
if (n.implementsSimpleTag()) {
generateCustomDoTag(n, handlerInfo, tagHandlerVar);
} else {
/*
* Classic tag handler: Generate code for start element, body,
* and end element
*/
generateCustomStart(n, handlerInfo, tagHandlerVar, tagEvalVar,
tagPushBodyCountVar);
// visit body
String tmpParent = parent;
parent = tagHandlerVar;
boolean isSimpleTagParentSave = isSimpleTagParent;
isSimpleTagParent = false;
String tmpPushBodyCountVar = null;
if (n.implementsTryCatchFinally()) {
tmpPushBodyCountVar = pushBodyCountVar;
pushBodyCountVar = tagPushBodyCountVar;
}
boolean tmpIsSimpleTagHandler = isSimpleTagHandler;
isSimpleTagHandler = false;
visitBody(n);
parent = tmpParent;
isSimpleTagParent = isSimpleTagParentSave;
if (n.implementsTryCatchFinally()) {
pushBodyCountVar = tmpPushBodyCountVar;
}
isSimpleTagHandler = tmpIsSimpleTagHandler;
generateCustomEnd(n, tagHandlerVar, tagEvalVar,
tagPushBodyCountVar);
}
if (ci.isScriptless() && !ci.hasScriptingVars()) {
// Generate end of method
if (methodNesting > 0) {
out.printil("return false;");
}
out.popIndent();
out.printil("}");
out.popIndent();
methodNesting--;
// restore previous writer
out = outSave;
}
}
private static final String SINGLE_QUOTE = "'";
private static final String DOUBLE_QUOTE = "\\\"";
public void visit(Node.UninterpretedTag n) throws JasperException {
n.setBeginJavaLine(out.getJavaLine());
/*
* Write begin tag
*/
out.printin("out.write(\"<");
out.print(n.getQName());
Attributes attrs = n.getNonTaglibXmlnsAttributes();
int attrsLen = (attrs == null) ? 0 : attrs.getLength();
for (int i = 0; i < attrsLen; i++) {
out.print(" ");
out.print(attrs.getQName(i));
out.print("=");
out.print(DOUBLE_QUOTE);
out.print(attrs.getValue(i).replace("\"", """));
out.print(DOUBLE_QUOTE);
}
attrs = n.getAttributes();
attrsLen = (attrs == null) ? 0 : attrs.getLength();
Node.JspAttribute[] jspAttrs = n.getJspAttributes();
for (int i = 0; i < attrsLen; i++) {
out.print(" ");
out.print(attrs.getQName(i));
out.print("=");
if (jspAttrs[i].isELInterpreterInput()) {
out.print("\\\"\" + ");
out.print(attributeValue(jspAttrs[i], false, String.class));
out.print(" + \"\\\"");
} else {
out.print(DOUBLE_QUOTE);
out.print(attrs.getValue(i).replace("\"", """));
out.print(DOUBLE_QUOTE);
}
}
if (n.getBody() != null) {
out.println(">\");");
// Visit tag body
visitBody(n);
/*
* Write end tag
*/
out.printin("out.write(\"</");
out.print(n.getQName());
out.println(">\");");
} else {
out.println("/>\");");
}
n.setEndJavaLine(out.getJavaLine());
}
public void visit(Node.JspElement n) throws JasperException {
n.setBeginJavaLine(out.getJavaLine());
// Compute attribute value string for XML-style and named
// attributes
Hashtable map = new Hashtable();
Node.JspAttribute[] attrs = n.getJspAttributes();
for (int i = 0; attrs != null && i < attrs.length; i++) {
String attrStr = null;
if (attrs[i].isNamedAttribute()) {
attrStr = generateNamedAttributeValue(attrs[i]
.getNamedAttributeNode());
} else {
attrStr = attributeValue(attrs[i], false, Object.class);
}
String s = " + \" " + attrs[i].getName() + "=\\\"\" + "
+ attrStr + " + \"\\\"\"";
map.put(attrs[i].getName(), s);
}
// Write begin tag, using XML-style 'name' attribute as the
// element name
String elemName = attributeValue(n.getNameAttribute(), false,
String.class);
out.printin("out.write(\"<\"");
out.print(" + " + elemName);
// Write remaining attributes
Enumeration enumeration = map.keys();
while (enumeration.hasMoreElements()) {
String attrName = (String) enumeration.nextElement();
out.print((String) map.get(attrName));
}
// Does the <jsp:element> have nested tags other than
// <jsp:attribute>
boolean hasBody = false;
Node.Nodes subelements = n.getBody();
if (subelements != null) {
for (int i = 0; i < subelements.size(); i++) {
Node subelem = subelements.getNode(i);
if (!(subelem instanceof Node.NamedAttribute)) {
hasBody = true;
break;
}
}
}
if (hasBody) {
out.println(" + \">\");");
// Smap should not include the body
n.setEndJavaLine(out.getJavaLine());
// Visit tag body
visitBody(n);
// Write end tag
out.printin("out.write(\"</\"");
out.print(" + " + elemName);
out.println(" + \">\");");
} else {
out.println(" + \"/>\");");
n.setEndJavaLine(out.getJavaLine());
}
}
public void visit(Node.TemplateText n) throws JasperException {
String text = n.getText();
int textSize = text.length();
if (textSize == 0) {
return;
}
if (textSize <= 3) {
// Special case small text strings
n.setBeginJavaLine(out.getJavaLine());
int lineInc = 0;
for (int i = 0; i < textSize; i++) {
char ch = text.charAt(i);
out.printil("out.write(" + quote(ch) + ");");
if (i > 0) {
n.addSmap(lineInc);
}
if (ch == '\n') {
lineInc++;
}
}
n.setEndJavaLine(out.getJavaLine());
return;
}
if (ctxt.getOptions().genStringAsCharArray()) {
// Generate Strings as char arrays, for performance
ServletWriter caOut;
if (charArrayBuffer == null) {
charArrayBuffer = new GenBuffer();
caOut = charArrayBuffer.getOut();
caOut.pushIndent();
textMap = new HashMap();
} else {
caOut = charArrayBuffer.getOut();
}
String charArrayName = (String) textMap.get(text);
if (charArrayName == null) {
charArrayName = "_jspx_char_array_" + charArrayCount++;
textMap.put(text, charArrayName);
caOut.printin("static char[] ");
caOut.print(charArrayName);
caOut.print(" = ");
caOut.print(quote(text));
caOut.println(".toCharArray();");
}
n.setBeginJavaLine(out.getJavaLine());
out.printil("out.write(" + charArrayName + ");");
n.setEndJavaLine(out.getJavaLine());
return;
}
n.setBeginJavaLine(out.getJavaLine());
out.printin();
StringBuffer sb = new StringBuffer("out.write(\"");
int initLength = sb.length();
int count = JspUtil.CHUNKSIZE;
int srcLine = 0; // relative to starting srouce line
for (int i = 0; i < text.length(); i++) {
char ch = text.charAt(i);
--count;
switch (ch) {
case '"':
sb.append('\\').append('\"');
break;
case '\\':
sb.append('\\').append('\\');
break;
case '\r':
sb.append('\\').append('r');
break;
case '\n':
sb.append('\\').append('n');
srcLine++;
if (breakAtLF || count < 0) {
// Generate an out.write() when see a '\n' in template
sb.append("\");");
out.println(sb.toString());
if (i < text.length() - 1) {
out.printin();
}
sb.setLength(initLength);
count = JspUtil.CHUNKSIZE;
}
// add a Smap for this line
n.addSmap(srcLine);
break;
case '\t': // Not sure we need this
sb.append('\\').append('t');
break;
default:
sb.append(ch);
}
}
if (sb.length() > initLength) {
sb.append("\");");
out.println(sb.toString());
}
n.setEndJavaLine(out.getJavaLine());
}
public void visit(Node.JspBody n) throws JasperException {
if (n.getBody() != null) {
if (isSimpleTagHandler) {
out.printin(simpleTagHandlerVar);
out.print(".setJspBody(");
generateJspFragment(n, simpleTagHandlerVar);
out.println(");");
} else {
visitBody(n);
}
}
}
public void visit(Node.InvokeAction n) throws JasperException {
n.setBeginJavaLine(out.getJavaLine());
// Copy virtual page scope of tag file to page scope of invoking
// page
out.printil("((org.apache.struts2.jasper.runtime.JspContextWrapper) this.jspContext).syncBeforeInvoke();");
String varReaderAttr = n.getTextAttribute("varReader");
String varAttr = n.getTextAttribute("var");
if (varReaderAttr != null || varAttr != null) {
out.printil("_jspx_sout = new java.io.StringWriter();");
} else {
out.printil("_jspx_sout = null;");
}
// Invoke fragment, unless fragment is null
out.printin("if (");
out.print(toGetterMethod(n.getTextAttribute("fragment")));
out.println(" != null) {");
out.pushIndent();
out.printin(toGetterMethod(n.getTextAttribute("fragment")));
out.println(".invoke(_jspx_sout);");
out.popIndent();
out.printil("}");
// Store varReader in appropriate scope
if (varReaderAttr != null || varAttr != null) {
String scopeName = n.getTextAttribute("scope");
out.printin("_jspx_page_context.setAttribute(");
if (varReaderAttr != null) {
out.print(quote(varReaderAttr));
out.print(", new java.io.StringReader(_jspx_sout.toString())");
} else {
out.print(quote(varAttr));
out.print(", _jspx_sout.toString()");
}
if (scopeName != null) {
out.print(", ");
out.print(getScopeConstant(scopeName));
}
out.println(");");
}
// Restore EL context
out.printil("jspContext.getELContext().putContext(JspContext.class,getJspContext());");
n.setEndJavaLine(out.getJavaLine());
}
public void visit(Node.DoBodyAction n) throws JasperException {
n.setBeginJavaLine(out.getJavaLine());
// Copy virtual page scope of tag file to page scope of invoking
// page
out.printil("((org.apache.struts2.jasper.runtime.JspContextWrapper) this.jspContext).syncBeforeInvoke();");
// Invoke body
String varReaderAttr = n.getTextAttribute("varReader");
String varAttr = n.getTextAttribute("var");
if (varReaderAttr != null || varAttr != null) {
out.printil("_jspx_sout = new java.io.StringWriter();");
} else {
out.printil("_jspx_sout = null;");
}
out.printil("if (getJspBody() != null)");
out.pushIndent();
out.printil("getJspBody().invoke(_jspx_sout);");
out.popIndent();
// Store varReader in appropriate scope
if (varReaderAttr != null || varAttr != null) {
String scopeName = n.getTextAttribute("scope");
out.printin("_jspx_page_context.setAttribute(");
if (varReaderAttr != null) {
out.print(quote(varReaderAttr));
out
.print(", new java.io.StringReader(_jspx_sout.toString())");
} else {
out.print(quote(varAttr));
out.print(", _jspx_sout.toString()");
}
if (scopeName != null) {
out.print(", ");
out.print(getScopeConstant(scopeName));
}
out.println(");");
}
// Restore EL context
out.printil("jspContext.getELContext().putContext(JspContext.class,getJspContext());");
n.setEndJavaLine(out.getJavaLine());
}
public void visit(Node.AttributeGenerator n) throws JasperException {
Node.CustomTag tag = n.getTag();
Node.JspAttribute[] attrs = tag.getJspAttributes();
for (int i = 0; attrs != null && i < attrs.length; i++) {
if (attrs[i].getName().equals(n.getName())) {
out.print(evaluateAttribute(getTagHandlerInfo(tag),
attrs[i], tag, null));
break;
}
}
}
private TagHandlerInfo getTagHandlerInfo(Node.CustomTag n)
throws JasperException {
Hashtable handlerInfosByShortName = (Hashtable) handlerInfos.get(n
.getPrefix());
if (handlerInfosByShortName == null) {
handlerInfosByShortName = new Hashtable();
handlerInfos.put(n.getPrefix(), handlerInfosByShortName);
}
TagHandlerInfo handlerInfo = (TagHandlerInfo) handlerInfosByShortName
.get(n.getLocalName());
if (handlerInfo == null) {
handlerInfo = new TagHandlerInfo(n, n.getTagHandlerClass(), err);
handlerInfosByShortName.put(n.getLocalName(), handlerInfo);
}
return handlerInfo;
}
private void generateTagPlugin(Node.CustomTag n) throws JasperException {
if (n.getAtSTag() != null) {
n.getAtSTag().visit(this);
}
visitBody(n);
if (n.getAtETag() != null) {
n.getAtETag().visit(this);
}
}
private void generateCustomStart(Node.CustomTag n,
TagHandlerInfo handlerInfo, String tagHandlerVar,
String tagEvalVar, String tagPushBodyCountVar)
throws JasperException {
Class tagHandlerClass = handlerInfo.getTagHandlerClass();
out.printin("// ");
out.println(n.getQName());
n.setBeginJavaLine(out.getJavaLine());
// Declare AT_BEGIN scripting variables
declareScriptingVars(n, VariableInfo.AT_BEGIN);
saveScriptingVars(n, VariableInfo.AT_BEGIN);
String tagHandlerClassName = JspUtil
.getCanonicalName(tagHandlerClass);
out.printin(tagHandlerClassName);
out.print(" ");
out.print(tagHandlerVar);
out.print(" = ");
if (isPoolingEnabled && !(n.implementsJspIdConsumer())) {
out.print("(");
out.print(tagHandlerClassName);
out.print(") ");
out.print(n.getTagHandlerPoolName());
out.print(".get(");
out.print(tagHandlerClassName);
out.println(".class);");
} else {
out.print("new ");
out.print(tagHandlerClassName);
out.println("();");
out.printin("org.apache.struts2.jasper.runtime.AnnotationHelper.postConstruct(");
out.print(VAR_ANNOTATIONPROCESSOR);
out.print(", ");
out.print(tagHandlerVar);
out.println(");");
}
// includes setting the context
generateSetters(n, tagHandlerVar, handlerInfo, false);
// JspIdConsumer (after context has been set)
if (n.implementsJspIdConsumer()) {
out.printin(tagHandlerVar);
out.print(".setJspId(\"");
out.print(createJspId());
out.println("\");");
}
if (n.implementsTryCatchFinally()) {
out.printin("int[] ");
out.print(tagPushBodyCountVar);
out.println(" = new int[] { 0 };");
out.printil("try {");
out.pushIndent();
}
out.printin("int ");
out.print(tagEvalVar);
out.print(" = ");
out.print(tagHandlerVar);
out.println(".doStartTag();");
if (!n.implementsBodyTag()) {
// Synchronize AT_BEGIN scripting variables
syncScriptingVars(n, VariableInfo.AT_BEGIN);
}
if (!n.hasEmptyBody()) {
out.printin("if (");
out.print(tagEvalVar);
out.println(" != javax.servlet.jsp.tagext.Tag.SKIP_BODY) {");
out.pushIndent();
// Declare NESTED scripting variables
declareScriptingVars(n, VariableInfo.NESTED);
saveScriptingVars(n, VariableInfo.NESTED);
if (n.implementsBodyTag()) {
out.printin("if (");
out.print(tagEvalVar);
out
.println(" != javax.servlet.jsp.tagext.Tag.EVAL_BODY_INCLUDE) {");
// Assume EVAL_BODY_BUFFERED
out.pushIndent();
out.printil("out = _jspx_page_context.pushBody();");
if (n.implementsTryCatchFinally()) {
out.printin(tagPushBodyCountVar);
out.println("[0]++;");
} else if (pushBodyCountVar != null) {
out.printin(pushBodyCountVar);
out.println("[0]++;");
}
out.printin(tagHandlerVar);
out
.println(".setBodyContent((javax.servlet.jsp.tagext.BodyContent) out);");
out.printin(tagHandlerVar);
out.println(".doInitBody();");
out.popIndent();
out.printil("}");
// Synchronize AT_BEGIN and NESTED scripting variables
syncScriptingVars(n, VariableInfo.AT_BEGIN);
syncScriptingVars(n, VariableInfo.NESTED);
} else {
// Synchronize NESTED scripting variables
syncScriptingVars(n, VariableInfo.NESTED);
}
if (n.implementsIterationTag()) {
out.printil("do {");
out.pushIndent();
}
}
// Map the Java lines that handles start of custom tags to the
// JSP line for this tag
n.setEndJavaLine(out.getJavaLine());
}
private void generateCustomEnd(Node.CustomTag n, String tagHandlerVar,
String tagEvalVar, String tagPushBodyCountVar) {
if (!n.hasEmptyBody()) {
if (n.implementsIterationTag()) {
out.printin("int evalDoAfterBody = ");
out.print(tagHandlerVar);
out.println(".doAfterBody();");
// Synchronize AT_BEGIN and NESTED scripting variables
syncScriptingVars(n, VariableInfo.AT_BEGIN);
syncScriptingVars(n, VariableInfo.NESTED);
out
.printil("if (evalDoAfterBody != javax.servlet.jsp.tagext.BodyTag.EVAL_BODY_AGAIN)");
out.pushIndent();
out.printil("break;");
out.popIndent();
out.popIndent();
out.printil("} while (true);");
}
restoreScriptingVars(n, VariableInfo.NESTED);
if (n.implementsBodyTag()) {
out.printin("if (");
out.print(tagEvalVar);
out
.println(" != javax.servlet.jsp.tagext.Tag.EVAL_BODY_INCLUDE) {");
out.pushIndent();
out.printil("out = _jspx_page_context.popBody();");
if (n.implementsTryCatchFinally()) {
out.printin(tagPushBodyCountVar);
out.println("[0]--;");
} else if (pushBodyCountVar != null) {
out.printin(pushBodyCountVar);
out.println("[0]--;");
}
out.popIndent();
out.printil("}");
}
out.popIndent(); // EVAL_BODY
out.printil("}");
}
out.printin("if (");
out.print(tagHandlerVar);
out
.println(".doEndTag() == javax.servlet.jsp.tagext.Tag.SKIP_PAGE) {");
out.pushIndent();
if (!n.implementsTryCatchFinally()) {
if (isPoolingEnabled && !(n.implementsJspIdConsumer())) {
out.printin(n.getTagHandlerPoolName());
out.print(".reuse(");
out.print(tagHandlerVar);
out.println(");");
} else {
out.printin(tagHandlerVar);
out.println(".release();");
out.printin("org.apache.struts2.jasper.runtime.AnnotationHelper.preDestroy(");
out.print(VAR_ANNOTATIONPROCESSOR);
out.print(", ");
out.print(tagHandlerVar);
out.println(");");
}
}
if (isTagFile || isFragment) {
out.printil("throw new SkipPageException();");
} else {
out.printil((methodNesting > 0) ? "return true;" : "return;");
}
out.popIndent();
out.printil("}");
// Synchronize AT_BEGIN scripting variables
syncScriptingVars(n, VariableInfo.AT_BEGIN);
// TryCatchFinally
if (n.implementsTryCatchFinally()) {
out.popIndent(); // try
out.printil("} catch (Throwable _jspx_exception) {");
out.pushIndent();
out.printin("while (");
out.print(tagPushBodyCountVar);
out.println("[0]-- > 0)");
out.pushIndent();
out.printil("out = _jspx_page_context.popBody();");
out.popIndent();
out.printin(tagHandlerVar);
out.println(".doCatch(_jspx_exception);");
out.popIndent();
out.printil("} finally {");
out.pushIndent();
out.printin(tagHandlerVar);
out.println(".doFinally();");
}
if (isPoolingEnabled && !(n.implementsJspIdConsumer())) {
out.printin(n.getTagHandlerPoolName());
out.print(".reuse(");
out.print(tagHandlerVar);
out.println(");");
} else {
out.printin(tagHandlerVar);
out.println(".release();");
out.printin("org.apache.struts2.jasper.runtime.AnnotationHelper.preDestroy(");
out.print(VAR_ANNOTATIONPROCESSOR);
out.print(", ");
out.print(tagHandlerVar);
out.println(");");
}
if (n.implementsTryCatchFinally()) {
out.popIndent();
out.printil("}");
}
// Declare and synchronize AT_END scripting variables (must do this
// outside the try/catch/finally block)
declareScriptingVars(n, VariableInfo.AT_END);
syncScriptingVars(n, VariableInfo.AT_END);
restoreScriptingVars(n, VariableInfo.AT_BEGIN);
}
private void generateCustomDoTag(Node.CustomTag n,
TagHandlerInfo handlerInfo, String tagHandlerVar)
throws JasperException {
Class tagHandlerClass = handlerInfo.getTagHandlerClass();
n.setBeginJavaLine(out.getJavaLine());
out.printin("// ");
out.println(n.getQName());
// Declare AT_BEGIN scripting variables
declareScriptingVars(n, VariableInfo.AT_BEGIN);
saveScriptingVars(n, VariableInfo.AT_BEGIN);
String tagHandlerClassName = JspUtil
.getCanonicalName(tagHandlerClass);
out.printin(tagHandlerClassName);
out.print(" ");
out.print(tagHandlerVar);
out.print(" = ");
out.print("new ");
out.print(tagHandlerClassName);
out.println("();");
// Resource injection
out.printin("org.apache.struts2.jasper.runtime.AnnotationHelper.postConstruct(");
out.print(VAR_ANNOTATIONPROCESSOR);
out.print(", ");
out.print(tagHandlerVar);
out.println(");");
generateSetters(n, tagHandlerVar, handlerInfo, true);
// JspIdConsumer (after context has been set)
if (n.implementsJspIdConsumer()) {
out.printin(tagHandlerVar);
out.print(".setJspId(\"");
out.print(createJspId());
out.println("\");");
}
// Set the body
if (findJspBody(n) == null) {
/*
* Encapsulate body of custom tag invocation in JspFragment and
* pass it to tag handler's setJspBody(), unless tag body is
* empty
*/
if (!n.hasEmptyBody()) {
out.printin(tagHandlerVar);
out.print(".setJspBody(");
generateJspFragment(n, tagHandlerVar);
out.println(");");
}
} else {
/*
* Body of tag is the body of the <jsp:body> element. The visit
* method for that element is going to encapsulate that
* element's body in a JspFragment and pass it to the tag
* handler's setJspBody()
*/
String tmpTagHandlerVar = simpleTagHandlerVar;
simpleTagHandlerVar = tagHandlerVar;
boolean tmpIsSimpleTagHandler = isSimpleTagHandler;
isSimpleTagHandler = true;
visitBody(n);
simpleTagHandlerVar = tmpTagHandlerVar;
isSimpleTagHandler = tmpIsSimpleTagHandler;
}
out.printin(tagHandlerVar);
out.println(".doTag();");
restoreScriptingVars(n, VariableInfo.AT_BEGIN);
// Synchronize AT_BEGIN scripting variables
syncScriptingVars(n, VariableInfo.AT_BEGIN);
// Declare and synchronize AT_END scripting variables
declareScriptingVars(n, VariableInfo.AT_END);
syncScriptingVars(n, VariableInfo.AT_END);
// Resource injection
out.printin("org.apache.struts2.jasper.runtime.AnnotationHelper.preDestroy(");
out.print(VAR_ANNOTATIONPROCESSOR);
out.print(", ");
out.print(tagHandlerVar);
out.println(");");
n.setEndJavaLine(out.getJavaLine());
}
private void declareScriptingVars(Node.CustomTag n, int scope) {
Vector vec = n.getScriptingVars(scope);
if (vec != null) {
for (int i = 0; i < vec.size(); i++) {
Object elem = vec.elementAt(i);
if (elem instanceof VariableInfo) {
VariableInfo varInfo = (VariableInfo) elem;
if (varInfo.getDeclare()) {
out.printin(varInfo.getClassName());
out.print(" ");
out.print(varInfo.getVarName());
out.println(" = null;");
}
} else {
TagVariableInfo tagVarInfo = (TagVariableInfo) elem;
if (tagVarInfo.getDeclare()) {
String varName = tagVarInfo.getNameGiven();
if (varName == null) {
varName = n.getTagData().getAttributeString(
tagVarInfo.getNameFromAttribute());
} else if (tagVarInfo.getNameFromAttribute() != null) {
// alias
continue;
}
out.printin(tagVarInfo.getClassName());
out.print(" ");
out.print(varName);
out.println(" = null;");
}
}
}
}
}
/*
* This method is called as part of the custom tag's start element.
*
* If the given custom tag has a custom nesting level greater than 0,
* save the current values of its scripting variables to temporary
* variables, so those values may be restored in the tag's end element.
* This way, the scripting variables may be synchronized by the given
* tag without affecting their original values.
*/
private void saveScriptingVars(Node.CustomTag n, int scope) {
if (n.getCustomNestingLevel() == 0) {
return;
}
TagVariableInfo[] tagVarInfos = n.getTagVariableInfos();
VariableInfo[] varInfos = n.getVariableInfos();
if ((varInfos.length == 0) && (tagVarInfos.length == 0)) {
return;
}
if (varInfos.length > 0) {
for (int i = 0; i < varInfos.length; i++) {
if (varInfos[i].getScope() != scope)
continue;
// If the scripting variable has been declared, skip codes
// for saving and restoring it.
if (n.getScriptingVars(scope).contains(varInfos[i]))
continue;
String varName = varInfos[i].getVarName();
String tmpVarName = "_jspx_" + varName + "_"
+ n.getCustomNestingLevel();
out.printin(tmpVarName);
out.print(" = ");
out.print(varName);
out.println(";");
}
} else {
for (int i = 0; i < tagVarInfos.length; i++) {
if (tagVarInfos[i].getScope() != scope)
continue;
// If the scripting variable has been declared, skip codes
// for saving and restoring it.
if (n.getScriptingVars(scope).contains(tagVarInfos[i]))
continue;
String varName = tagVarInfos[i].getNameGiven();
if (varName == null) {
varName = n.getTagData().getAttributeString(
tagVarInfos[i].getNameFromAttribute());
} else if (tagVarInfos[i].getNameFromAttribute() != null) {
// alias
continue;
}
String tmpVarName = "_jspx_" + varName + "_"
+ n.getCustomNestingLevel();
out.printin(tmpVarName);
out.print(" = ");
out.print(varName);
out.println(";");
}
}
}
/*
* This method is called as part of the custom tag's end element.
*
* If the given custom tag has a custom nesting level greater than 0,
* restore its scripting variables to their original values that were
* saved in the tag's start element.
*/
private void restoreScriptingVars(Node.CustomTag n, int scope) {
if (n.getCustomNestingLevel() == 0) {
return;
}
TagVariableInfo[] tagVarInfos = n.getTagVariableInfos();
VariableInfo[] varInfos = n.getVariableInfos();
if ((varInfos.length == 0) && (tagVarInfos.length == 0)) {
return;
}
if (varInfos.length > 0) {
for (int i = 0; i < varInfos.length; i++) {
if (varInfos[i].getScope() != scope)
continue;
// If the scripting variable has been declared, skip codes
// for saving and restoring it.
if (n.getScriptingVars(scope).contains(varInfos[i]))
continue;
String varName = varInfos[i].getVarName();
String tmpVarName = "_jspx_" + varName + "_"
+ n.getCustomNestingLevel();
out.printin(varName);
out.print(" = ");
out.print(tmpVarName);
out.println(";");
}
} else {
for (int i = 0; i < tagVarInfos.length; i++) {
if (tagVarInfos[i].getScope() != scope)
continue;
// If the scripting variable has been declared, skip codes
// for saving and restoring it.
if (n.getScriptingVars(scope).contains(tagVarInfos[i]))
continue;
String varName = tagVarInfos[i].getNameGiven();
if (varName == null) {
varName = n.getTagData().getAttributeString(
tagVarInfos[i].getNameFromAttribute());
} else if (tagVarInfos[i].getNameFromAttribute() != null) {
// alias
continue;
}
String tmpVarName = "_jspx_" + varName + "_"
+ n.getCustomNestingLevel();
out.printin(varName);
out.print(" = ");
out.print(tmpVarName);
out.println(";");
}
}
}
/*
* Synchronizes the scripting variables of the given custom tag for the
* given scope.
*/
private void syncScriptingVars(Node.CustomTag n, int scope) {
TagVariableInfo[] tagVarInfos = n.getTagVariableInfos();
VariableInfo[] varInfos = n.getVariableInfos();
if ((varInfos.length == 0) && (tagVarInfos.length == 0)) {
return;
}
if (varInfos.length > 0) {
for (int i = 0; i < varInfos.length; i++) {
if (varInfos[i].getScope() == scope) {
out.printin(varInfos[i].getVarName());
out.print(" = (");
out.print(varInfos[i].getClassName());
out.print(") _jspx_page_context.findAttribute(");
out.print(quote(varInfos[i].getVarName()));
out.println(");");
}
}
} else {
for (int i = 0; i < tagVarInfos.length; i++) {
if (tagVarInfos[i].getScope() == scope) {
String name = tagVarInfos[i].getNameGiven();
if (name == null) {
name = n.getTagData().getAttributeString(
tagVarInfos[i].getNameFromAttribute());
} else if (tagVarInfos[i].getNameFromAttribute() != null) {
// alias
continue;
}
out.printin(name);
out.print(" = (");
out.print(tagVarInfos[i].getClassName());
out.print(") _jspx_page_context.findAttribute(");
out.print(quote(name));
out.println(");");
}
}
}
}
private String getJspContextVar() {
if (this.isTagFile) {
return "this.getJspContext()";
} else {
return "_jspx_page_context";
}
}
private String getExpressionFactoryVar() {
return VAR_EXPRESSIONFACTORY;
}
/*
* Creates a tag variable name by concatenating the given prefix and
* shortName and endcoded to make the resultant string a valid Java
* Identifier.
*/
private String createTagVarName(String fullName, String prefix,
String shortName) {
String varName;
synchronized (tagVarNumbers) {
varName = prefix + "_" + shortName + "_";
if (tagVarNumbers.get(fullName) != null) {
Integer i = (Integer) tagVarNumbers.get(fullName);
varName = varName + i.intValue();
tagVarNumbers.put(fullName, new Integer(i.intValue() + 1));
} else {
tagVarNumbers.put(fullName, new Integer(1));
varName = varName + "0";
}
}
return JspUtil.makeJavaIdentifier(varName);
}
private String evaluateAttribute(TagHandlerInfo handlerInfo,
Node.JspAttribute attr, Node.CustomTag n, String tagHandlerVar)
throws JasperException {
String attrValue = attr.getValue();
if (attrValue == null) {
if (attr.isNamedAttribute()) {
if (n.checkIfAttributeIsJspFragment(attr.getName())) {
// XXX - no need to generate temporary variable here
attrValue = generateNamedAttributeJspFragment(attr
.getNamedAttributeNode(), tagHandlerVar);
} else {
attrValue = generateNamedAttributeValue(attr
.getNamedAttributeNode());
}
} else {
return null;
}
}
String localName = attr.getLocalName();
Method m = null;
Class[] c = null;
if (attr.isDynamic()) {
c = OBJECT_CLASS;
} else {
m = handlerInfo.getSetterMethod(localName);
if (m == null) {
err.jspError(n, "jsp.error.unable.to_find_method", attr
.getName());
}
c = m.getParameterTypes();
// XXX assert(c.length > 0)
}
if (attr.isExpression()) {
// Do nothing
} else if (attr.isNamedAttribute()) {
if (!n.checkIfAttributeIsJspFragment(attr.getName())
&& !attr.isDynamic()) {
attrValue = convertString(c[0], attrValue, localName,
handlerInfo.getPropertyEditorClass(localName), true);
}
} else if (attr.isELInterpreterInput()) {
// results buffer
StringBuffer sb = new StringBuffer(64);
TagAttributeInfo tai = attr.getTagAttributeInfo();
// generate elContext reference
sb.append(getJspContextVar());
sb.append(".getELContext()");
String elContext = sb.toString();
if (attr.getEL() != null && attr.getEL().getMapName() != null) {
sb.setLength(0);
sb.append("new org.apache.struts2.jasper.el.ELContextWrapper(");
sb.append(elContext);
sb.append(',');
sb.append(attr.getEL().getMapName());
sb.append(')');
elContext = sb.toString();
}
// reset buffer
sb.setLength(0);
// create our mark
sb.append(n.getStart().toString());
sb.append(" '");
sb.append(attrValue);
sb.append('\'');
String mark = sb.toString();
// reset buffer
sb.setLength(0);
// depending on type
if (attr.isDeferredInput()
|| ((tai != null) && ValueExpression.class.getName().equals(tai.getTypeName()))) {
sb.append("new org.apache.struts2.jasper.el.JspValueExpression(");
sb.append(quote(mark));
sb.append(',');
sb.append(getExpressionFactoryVar());
sb.append(".createValueExpression(");
if (attr.getEL() != null) { // optimize
sb.append(elContext);
sb.append(',');
}
sb.append(quote(attrValue));
sb.append(',');
sb.append(JspUtil.toJavaSourceTypeFromTld(attr.getExpectedTypeName()));
sb.append("))");
// should the expression be evaluated before passing to
// the setter?
boolean evaluate = false;
if (tai.canBeRequestTime()) {
evaluate = true; // JSP.2.3.2
}
if (attr.isDeferredInput()) {
evaluate = false; // JSP.2.3.3
}
if (attr.isDeferredInput() && tai.canBeRequestTime()) {
evaluate = !attrValue.contains("#{"); // JSP.2.3.5
}
if (evaluate) {
sb.append(".getValue(");
sb.append(getJspContextVar());
sb.append(".getELContext()");
sb.append(")");
}
attrValue = sb.toString();
} else if (attr.isDeferredMethodInput()
|| ((tai != null) && MethodExpression.class.getName().equals(tai.getTypeName()))) {
sb.append("new org.apache.struts2.jasper.el.JspMethodExpression(");
sb.append(quote(mark));
sb.append(',');
sb.append(getExpressionFactoryVar());
sb.append(".createMethodExpression(");
sb.append(elContext);
sb.append(',');
sb.append(quote(attrValue));
sb.append(',');
sb.append(JspUtil.toJavaSourceTypeFromTld(attr.getExpectedTypeName()));
sb.append(',');
sb.append("new Class[] {");
String[] p = attr.getParameterTypeNames();
for (int i = 0; i < p.length; i++) {
sb.append(JspUtil.toJavaSourceTypeFromTld(p[i]));
sb.append(',');
}
if (p.length > 0) {
sb.setLength(sb.length() - 1);
}
sb.append("}))");
attrValue = sb.toString();
} else {
// run attrValue through the expression interpreter
String mapName = (attr.getEL() != null) ? attr.getEL()
.getMapName() : null;
attrValue = attributeValueWithEL(this.isTagFile,
attrValue, c[0], mapName);
}
} else {
attrValue = convertString(c[0], attrValue, localName,
handlerInfo.getPropertyEditorClass(localName), false);
}
return attrValue;
}
/**
* Generate code to create a map for the alias variables
*
* @return the name of the map
*/
private String generateAliasMap(Node.CustomTag n, String tagHandlerVar)
throws JasperException {
TagVariableInfo[] tagVars = n.getTagVariableInfos();
String aliasMapVar = null;
boolean aliasSeen = false;
for (int i = 0; i < tagVars.length; i++) {
String nameFrom = tagVars[i].getNameFromAttribute();
if (nameFrom != null) {
String aliasedName = n.getAttributeValue(nameFrom);
if (aliasedName == null)
continue;
if (!aliasSeen) {
out.printin("java.util.HashMap ");
aliasMapVar = tagHandlerVar + "_aliasMap";
out.print(aliasMapVar);
out.println(" = new java.util.HashMap();");
aliasSeen = true;
}
out.printin(aliasMapVar);
out.print(".put(");
out.print(quote(tagVars[i].getNameGiven()));
out.print(", ");
out.print(quote(aliasedName));
out.println(");");
}
}
return aliasMapVar;
}
private void generateSetters(Node.CustomTag n, String tagHandlerVar,
TagHandlerInfo handlerInfo, boolean simpleTag)
throws JasperException {
// Set context
if (simpleTag) {
// Generate alias map
String aliasMapVar = null;
if (n.isTagFile()) {
aliasMapVar = generateAliasMap(n, tagHandlerVar);
}
out.printin(tagHandlerVar);
if (aliasMapVar == null) {
out.println(".setJspContext(_jspx_page_context);");
} else {
out.print(".setJspContext(_jspx_page_context, ");
out.print(aliasMapVar);
out.println(");");
}
} else {
out.printin(tagHandlerVar);
out.println(".setPageContext(_jspx_page_context);");
}
// Set parent
if (isTagFile && parent == null) {
out.printin(tagHandlerVar);
out.print(".setParent(");
out.print("new javax.servlet.jsp.tagext.TagAdapter(");
out.print("(javax.servlet.jsp.tagext.SimpleTag) this ));");
} else if (!simpleTag) {
out.printin(tagHandlerVar);
out.print(".setParent(");
if (parent != null) {
if (isSimpleTagParent) {
out.print("new javax.servlet.jsp.tagext.TagAdapter(");
out.print("(javax.servlet.jsp.tagext.SimpleTag) ");
out.print(parent);
out.println("));");
} else {
out.print("(javax.servlet.jsp.tagext.Tag) ");
out.print(parent);
out.println(");");
}
} else {
out.println("null);");
}
} else {
// The setParent() method need not be called if the value being
// passed is null, since SimpleTag instances are not reused
if (parent != null) {
out.printin(tagHandlerVar);
out.print(".setParent(");
out.print(parent);
out.println(");");
}
}
// need to handle deferred values and methods
Node.JspAttribute[] attrs = n.getJspAttributes();
for (int i = 0; attrs != null && i < attrs.length; i++) {
String attrValue = evaluateAttribute(handlerInfo, attrs[i], n,
tagHandlerVar);
Mark m = n.getStart();
out.printil("// "+m.getFile()+"("+m.getLineNumber()+","+m.getColumnNumber()+") "+ attrs[i].getTagAttributeInfo());
if (attrs[i].isDynamic()) {
out.printin(tagHandlerVar);
out.print(".");
out.print("setDynamicAttribute(");
String uri = attrs[i].getURI();
if ("".equals(uri) || (uri == null)) {
out.print("null");
} else {
out.print("\"" + attrs[i].getURI() + "\"");
}
out.print(", \"");
out.print(attrs[i].getLocalName());
out.print("\", ");
out.print(attrValue);
out.println(");");
} else {
out.printin(tagHandlerVar);
out.print(".");
out.print(handlerInfo.getSetterMethod(
attrs[i].getLocalName()).getName());
out.print("(");
out.print(attrValue);
out.println(");");
}
}
}
/*
* @param c The target class to which to coerce the given string @param
* s The string value @param attrName The name of the attribute whose
* value is being supplied @param propEditorClass The property editor
* for the given attribute @param isNamedAttribute true if the given
* attribute is a named attribute (that is, specified using the
* jsp:attribute standard action), and false otherwise
*/
private String convertString(Class c, String s, String attrName,
Class propEditorClass, boolean isNamedAttribute)
throws JasperException {
String quoted = s;
if (!isNamedAttribute) {
quoted = quote(s);
}
if (propEditorClass != null) {
String className = JspUtil.getCanonicalName(c);
return "("
+ className
+ ")org.apache.struts2.jasper.runtime.JspRuntimeLibrary.getValueFromBeanInfoPropertyEditor("
+ className + ".class, \"" + attrName + "\", " + quoted
+ ", " + JspUtil.getCanonicalName(propEditorClass)
+ ".class)";
} else if (c == String.class) {
return quoted;
} else if (c == boolean.class) {
return JspUtil.coerceToPrimitiveBoolean(s, isNamedAttribute);
} else if (c == Boolean.class) {
return JspUtil.coerceToBoolean(s, isNamedAttribute);
} else if (c == byte.class) {
return JspUtil.coerceToPrimitiveByte(s, isNamedAttribute);
} else if (c == Byte.class) {
return JspUtil.coerceToByte(s, isNamedAttribute);
} else if (c == char.class) {
return JspUtil.coerceToChar(s, isNamedAttribute);
} else if (c == Character.class) {
return JspUtil.coerceToCharacter(s, isNamedAttribute);
} else if (c == double.class) {
return JspUtil.coerceToPrimitiveDouble(s, isNamedAttribute);
} else if (c == Double.class) {
return JspUtil.coerceToDouble(s, isNamedAttribute);
} else if (c == float.class) {
return JspUtil.coerceToPrimitiveFloat(s, isNamedAttribute);
} else if (c == Float.class) {
return JspUtil.coerceToFloat(s, isNamedAttribute);
} else if (c == int.class) {
return JspUtil.coerceToInt(s, isNamedAttribute);
} else if (c == Integer.class) {
return JspUtil.coerceToInteger(s, isNamedAttribute);
} else if (c == short.class) {
return JspUtil.coerceToPrimitiveShort(s, isNamedAttribute);
} else if (c == Short.class) {
return JspUtil.coerceToShort(s, isNamedAttribute);
} else if (c == long.class) {
return JspUtil.coerceToPrimitiveLong(s, isNamedAttribute);
} else if (c == Long.class) {
return JspUtil.coerceToLong(s, isNamedAttribute);
} else if (c == Object.class) {
return "new String(" + quoted + ")";
} else {
String className = JspUtil.getCanonicalName(c);
return "("
+ className
+ ")org.apache.struts2.jasper.runtime.JspRuntimeLibrary.getValueFromPropertyEditorManager("
+ className + ".class, \"" + attrName + "\", " + quoted
+ ")";
}
}
/*
* Converts the scope string representation, whose possible values are
* "page", "request", "session", and "application", to the corresponding
* scope constant.
*/
private String getScopeConstant(String scope) {
String scopeName = "PageContext.PAGE_SCOPE"; // Default to page
if ("request".equals(scope)) {
scopeName = "PageContext.REQUEST_SCOPE";
} else if ("session".equals(scope)) {
scopeName = "PageContext.SESSION_SCOPE";
} else if ("application".equals(scope)) {
scopeName = "PageContext.APPLICATION_SCOPE";
}
return scopeName;
}
/**
* Generates anonymous JspFragment inner class which is passed as an
* argument to SimpleTag.setJspBody().
*/
private void generateJspFragment(Node n, String tagHandlerVar)
throws JasperException {
// XXX - A possible optimization here would be to check to see
// if the only child of the parent node is TemplateText. If so,
// we know there won't be any parameters, etc, so we can
// generate a low-overhead JspFragment that just echoes its
// body. The implementation of this fragment can come from
// the org.apache.struts2.jasper.runtime package as a support class.
FragmentHelperClass.Fragment fragment = fragmentHelperClass
.openFragment(n, tagHandlerVar, methodNesting);
ServletWriter outSave = out;
out = fragment.getGenBuffer().getOut();
String tmpParent = parent;
parent = "_jspx_parent";
boolean isSimpleTagParentSave = isSimpleTagParent;
isSimpleTagParent = true;
boolean tmpIsFragment = isFragment;
isFragment = true;
String pushBodyCountVarSave = pushBodyCountVar;
if (pushBodyCountVar != null) {
// Use a fixed name for push body count, to simplify code gen
pushBodyCountVar = "_jspx_push_body_count";
}
visitBody(n);
out = outSave;
parent = tmpParent;
isSimpleTagParent = isSimpleTagParentSave;
isFragment = tmpIsFragment;
pushBodyCountVar = pushBodyCountVarSave;
fragmentHelperClass.closeFragment(fragment, methodNesting);
// XXX - Need to change pageContext to jspContext if
// we're not in a place where pageContext is defined (e.g.
// in a fragment or in a tag file.
out.print("new " + fragmentHelperClass.getClassName() + "( "
+ fragment.getId() + ", _jspx_page_context, "
+ tagHandlerVar + ", " + pushBodyCountVar + ")");
}
/**
* Generate the code required to obtain the runtime value of the given
* named attribute.
*
* @return The name of the temporary variable the result is stored in.
*/
public String generateNamedAttributeValue(Node.NamedAttribute n)
throws JasperException {
String varName = n.getTemporaryVariableName();
// If the only body element for this named attribute node is
// template text, we need not generate an extra call to
// pushBody and popBody. Maybe we can further optimize
// here by getting rid of the temporary variable, but in
// reality it looks like javac does this for us.
Node.Nodes body = n.getBody();
if (body != null) {
boolean templateTextOptimization = false;
if (body.size() == 1) {
Node bodyElement = body.getNode(0);
if (bodyElement instanceof Node.TemplateText) {
templateTextOptimization = true;
out.printil("String "
+ varName
+ " = "
+ quote(new String(
((Node.TemplateText) bodyElement)
.getText())) + ";");
}
}
// XXX - Another possible optimization would be for
// lone EL expressions (no need to pushBody here either).
if (!templateTextOptimization) {
out.printil("out = _jspx_page_context.pushBody();");
visitBody(n);
out.printil("String " + varName + " = "
+ "((javax.servlet.jsp.tagext.BodyContent)"
+ "out).getString();");
out.printil("out = _jspx_page_context.popBody();");
}
} else {
// Empty body must be treated as ""
out.printil("String " + varName + " = \"\";");
}
return varName;
}
/**
* Similar to generateNamedAttributeValue, but create a JspFragment
* instead.
*
* @param n
* The parent node of the named attribute
* @param tagHandlerVar
* The variable the tag handler is stored in, so the fragment
* knows its parent tag.
* @return The name of the temporary variable the fragment is stored in.
*/
public String generateNamedAttributeJspFragment(Node.NamedAttribute n,
String tagHandlerVar) throws JasperException {
String varName = n.getTemporaryVariableName();
out.printin("javax.servlet.jsp.tagext.JspFragment " + varName
+ " = ");
generateJspFragment(n, tagHandlerVar);
out.println(";");
return varName;
}
}
private static void generateLocalVariables(ServletWriter out, Node n)
throws JasperException {
Node.ChildInfo ci;
if (n instanceof Node.CustomTag) {
ci = ((Node.CustomTag) n).getChildInfo();
} else if (n instanceof Node.JspBody) {
ci = ((Node.JspBody) n).getChildInfo();
} else if (n instanceof Node.NamedAttribute) {
ci = ((Node.NamedAttribute) n).getChildInfo();
} else {
// Cannot access err since this method is static, but at
// least flag an error.
throw new JasperException("Unexpected Node Type");
// err.getString(
// "jsp.error.internal.unexpected_node_type" ) );
}
if (ci.hasUseBean()) {
out
.printil("HttpSession session = _jspx_page_context.getSession();");
out
.printil("ServletContext application = _jspx_page_context.getServletContext();");
}
if (ci.hasUseBean() || ci.hasIncludeAction() || ci.hasSetProperty()
|| ci.hasParamAction()) {
out
.printil("HttpServletRequest request = (HttpServletRequest)_jspx_page_context.getRequest();");
}
if (ci.hasIncludeAction()) {
out
.printil("HttpServletResponse response = (HttpServletResponse)_jspx_page_context.getResponse();");
}
}
/**
* Common part of postamble, shared by both servlets and tag files.
*/
private void genCommonPostamble() {
// Append any methods that were generated in the buffer.
for (int i = 0; i < methodsBuffered.size(); i++) {
GenBuffer methodBuffer = (GenBuffer) methodsBuffered.get(i);
methodBuffer.adjustJavaLines(out.getJavaLine() - 1);
out.printMultiLn(methodBuffer.toString());
}
// Append the helper class
if (fragmentHelperClass.isUsed()) {
fragmentHelperClass.generatePostamble();
fragmentHelperClass.adjustJavaLines(out.getJavaLine() - 1);
out.printMultiLn(fragmentHelperClass.toString());
}
// Append char array declarations
if (charArrayBuffer != null) {
out.printMultiLn(charArrayBuffer.toString());
}
// Close the class definition
out.popIndent();
out.printil("}");
}
/**
* Generates the ending part of the static portion of the servlet.
*/
private void generatePostamble(Node.Nodes page) {
out.popIndent();
out.printil("} catch (Throwable t) {");
out.pushIndent();
out.printil("if (!(t instanceof SkipPageException)){");
out.pushIndent();
out.printil("out = _jspx_out;");
out.printil("if (out != null && out.getBufferSize() != 0)");
out.pushIndent();
out.printil("try { out.clearBuffer(); } catch (java.io.IOException e) {}");
out.popIndent();
out
.printil("if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);");
out.popIndent();
out.printil("}");
out.popIndent();
out.printil("} finally {");
out.pushIndent();
out
.printil("_jspxFactory.releasePageContext(_jspx_page_context);");
out.popIndent();
out.printil("}");
// Close the service method
out.popIndent();
out.printil("}");
// Generated methods, helper classes, etc.
genCommonPostamble();
}
/**
* Constructor.
*/
Generator(ServletWriter out, Compiler compiler) {
this.out = out;
methodsBuffered = new ArrayList();
charArrayBuffer = null;
err = compiler.getErrorDispatcher();
ctxt = compiler.getCompilationContext();
fragmentHelperClass = new FragmentHelperClass("Helper");
pageInfo = compiler.getPageInfo();
/*
* Temporary hack. If a JSP page uses the "extends" attribute of the
* page directive, the _jspInit() method of the generated servlet class
* will not be called (it is only called for those generated servlets
* that extend HttpJspBase, the default), causing the tag handler pools
* not to be initialized and resulting in a NPE. The JSP spec needs to
* clarify whether containers can override init() and destroy(). For
* now, we just disable tag pooling for pages that use "extends".
*/
if (pageInfo.getExtends(false) == null) {
isPoolingEnabled = ctxt.getOptions().isPoolingEnabled();
} else {
isPoolingEnabled = false;
}
beanInfo = pageInfo.getBeanRepository();
breakAtLF = ctxt.getOptions().getMappedFile();
if (isPoolingEnabled) {
tagHandlerPoolNames = new Vector();
}
}
/**
* The main entry for Generator.
*
* @param out
* The servlet output writer
* @param compiler
* The compiler
* @param page
* The input page
*/
public static void generate(ServletWriter out, Compiler compiler,
Node.Nodes page) throws JasperException {
Generator gen = new Generator(out, compiler);
if (gen.isPoolingEnabled) {
gen.compileTagHandlerPoolList(page);
}
if (gen.ctxt.isTagFile()) {
JasperTagInfo tagInfo = (JasperTagInfo) gen.ctxt.getTagInfo();
gen.generateTagHandlerPreamble(tagInfo, page);
if (gen.ctxt.isPrototypeMode()) {
return;
}
gen.generateXmlProlog(page);
gen.fragmentHelperClass.generatePreamble();
page.visit(gen.new GenerateVisitor(gen.ctxt.isTagFile(), out,
gen.methodsBuffered, gen.fragmentHelperClass, gen.ctxt
.getClassLoader(), tagInfo));
gen.generateTagHandlerPostamble(tagInfo);
} else {
gen.generatePreamble(page);
gen.generateXmlProlog(page);
gen.fragmentHelperClass.generatePreamble();
page.visit(gen.new GenerateVisitor(gen.ctxt.isTagFile(), out,
gen.methodsBuffered, gen.fragmentHelperClass, gen.ctxt
.getClassLoader(), null));
gen.generatePostamble(page);
}
}
/*
* Generates tag handler preamble.
*/
private void generateTagHandlerPreamble(JasperTagInfo tagInfo,
Node.Nodes tag) throws JasperException {
// Generate package declaration
String className = tagInfo.getTagClassName();
int lastIndex = className.lastIndexOf('.');
if (lastIndex != -1) {
String pkgName = className.substring(0, lastIndex);
genPreamblePackage(pkgName);
className = className.substring(lastIndex + 1);
}
// Generate imports
genPreambleImports();
// Generate class declaration
out.printin("public final class ");
out.println(className);
out.printil(" extends javax.servlet.jsp.tagext.SimpleTagSupport");
out.printin(" implements org.apache.struts2.jasper.runtime.JspSourceDependent");
if (tagInfo.hasDynamicAttributes()) {
out.println(",");
out.printin(" javax.servlet.jsp.tagext.DynamicAttributes");
}
out.println(" {");
out.println();
out.pushIndent();
/*
* Class body begins here
*/
generateDeclarations(tag);
// Static initializations here
genPreambleStaticInitializers();
out.printil("private JspContext jspContext;");
// Declare writer used for storing result of fragment/body invocation
// if 'varReader' or 'var' attribute is specified
out.printil("private java.io.Writer _jspx_sout;");
// Class variable declarations
genPreambleClassVariableDeclarations(tagInfo.getTagName());
generateSetJspContext(tagInfo);
// Tag-handler specific declarations
generateTagHandlerAttributes(tagInfo);
if (tagInfo.hasDynamicAttributes())
generateSetDynamicAttribute();
// Methods here
genPreambleMethods();
// Now the doTag() method
out.printil("public void doTag() throws JspException, java.io.IOException {");
if (ctxt.isPrototypeMode()) {
out.printil("}");
out.popIndent();
out.printil("}");
return;
}
out.pushIndent();
/*
* According to the spec, 'pageContext' must not be made available as an
* implicit object in tag files. Declare _jspx_page_context, so we can
* share the code generator with JSPs.
*/
out.printil("PageContext _jspx_page_context = (PageContext)jspContext;");
// Declare implicit objects.
out.printil("HttpServletRequest request = "
+ "(HttpServletRequest) _jspx_page_context.getRequest();");
out.printil("HttpServletResponse response = "
+ "(HttpServletResponse) _jspx_page_context.getResponse();");
out.printil("HttpSession session = _jspx_page_context.getSession();");
out.printil("ServletContext application = _jspx_page_context.getServletContext();");
out.printil("ServletConfig config = _jspx_page_context.getServletConfig();");
out.printil("JspWriter out = jspContext.getOut();");
out.printil("_jspInit(config);");
// set current JspContext on ELContext
out.printil("jspContext.getELContext().putContext(JspContext.class,jspContext);");
generatePageScopedVariables(tagInfo);
declareTemporaryScriptingVars(tag);
out.println();
out.printil("try {");
out.pushIndent();
}
private void generateTagHandlerPostamble(TagInfo tagInfo) {
out.popIndent();
// Have to catch Throwable because a classic tag handler
// helper method is declared to throw Throwable.
out.printil("} catch( Throwable t ) {");
out.pushIndent();
out.printil("if( t instanceof SkipPageException )");
out.printil(" throw (SkipPageException) t;");
out.printil("if( t instanceof java.io.IOException )");
out.printil(" throw (java.io.IOException) t;");
out.printil("if( t instanceof IllegalStateException )");
out.printil(" throw (IllegalStateException) t;");
out.printil("if( t instanceof JspException )");
out.printil(" throw (JspException) t;");
out.printil("throw new JspException(t);");
out.popIndent();
out.printil("} finally {");
out.pushIndent();
// handle restoring VariableMapper
TagAttributeInfo[] attrInfos = tagInfo.getAttributes();
for (int i = 0; i < attrInfos.length; i++) {
if (attrInfos[i].isDeferredMethod() || attrInfos[i].isDeferredValue()) {
out.printin("_el_variablemapper.setVariable(");
out.print(quote(attrInfos[i].getName()));
out.print(",_el_ve");
out.print(i);
out.println(");");
}
}
// restore nested JspContext on ELContext
out.printil("jspContext.getELContext().putContext(JspContext.class,super.getJspContext());");
out.printil("((org.apache.struts2.jasper.runtime.JspContextWrapper) jspContext).syncEndTagFile();");
if (isPoolingEnabled && !tagHandlerPoolNames.isEmpty()) {
out.printil("_jspDestroy();");
}
out.popIndent();
out.printil("}");
// Close the doTag method
out.popIndent();
out.printil("}");
// Generated methods, helper classes, etc.
genCommonPostamble();
}
/**
* Generates declarations for tag handler attributes, and defines the getter
* and setter methods for each.
*/
private void generateTagHandlerAttributes(TagInfo tagInfo)
throws JasperException {
if (tagInfo.hasDynamicAttributes()) {
out.printil("private java.util.HashMap _jspx_dynamic_attrs = new java.util.HashMap();");
}
// Declare attributes
TagAttributeInfo[] attrInfos = tagInfo.getAttributes();
for (int i = 0; i < attrInfos.length; i++) {
out.printin("private ");
if (attrInfos[i].isFragment()) {
out.print("javax.servlet.jsp.tagext.JspFragment ");
} else {
out.print(JspUtil.toJavaSourceType(attrInfos[i].getTypeName()));
out.print(" ");
}
out.print(attrInfos[i].getName());
out.println(";");
}
out.println();
// Define attribute getter and setter methods
if (attrInfos != null) {
for (int i = 0; i < attrInfos.length; i++) {
// getter method
out.printin("public ");
if (attrInfos[i].isFragment()) {
out.print("javax.servlet.jsp.tagext.JspFragment ");
} else {
out.print(JspUtil.toJavaSourceType(attrInfos[i]
.getTypeName()));
out.print(" ");
}
out.print(toGetterMethod(attrInfos[i].getName()));
out.println(" {");
out.pushIndent();
out.printin("return this.");
out.print(attrInfos[i].getName());
out.println(";");
out.popIndent();
out.printil("}");
out.println();
// setter method
out.printin("public void ");
out.print(toSetterMethodName(attrInfos[i].getName()));
if (attrInfos[i].isFragment()) {
out.print("(javax.servlet.jsp.tagext.JspFragment ");
} else {
out.print("(");
out.print(JspUtil.toJavaSourceType(attrInfos[i]
.getTypeName()));
out.print(" ");
}
out.print(attrInfos[i].getName());
out.println(") {");
out.pushIndent();
out.printin("this.");
out.print(attrInfos[i].getName());
out.print(" = ");
out.print(attrInfos[i].getName());
out.println(";");
if (ctxt.isTagFile()) {
// Tag files should also set jspContext attributes
out.printin("jspContext.setAttribute(\"");
out.print(attrInfos[i].getName());
out.print("\", ");
out.print(attrInfos[i].getName());
out.println(");");
}
out.popIndent();
out.printil("}");
out.println();
}
}
}
/*
* Generate setter for JspContext so we can create a wrapper and store both
* the original and the wrapper. We need the wrapper to mask the page
* context from the tag file and simulate a fresh page context. We need the
* original to do things like sync AT_BEGIN and AT_END scripting variables.
*/
private void generateSetJspContext(TagInfo tagInfo) {
boolean nestedSeen = false;
boolean atBeginSeen = false;
boolean atEndSeen = false;
// Determine if there are any aliases
boolean aliasSeen = false;
TagVariableInfo[] tagVars = tagInfo.getTagVariableInfos();
for (int i = 0; i < tagVars.length; i++) {
if (tagVars[i].getNameFromAttribute() != null
&& tagVars[i].getNameGiven() != null) {
aliasSeen = true;
break;
}
}
if (aliasSeen) {
out
.printil("public void setJspContext(JspContext ctx, java.util.Map aliasMap) {");
} else {
out.printil("public void setJspContext(JspContext ctx) {");
}
out.pushIndent();
out.printil("super.setJspContext(ctx);");
out.printil("java.util.ArrayList _jspx_nested = null;");
out.printil("java.util.ArrayList _jspx_at_begin = null;");
out.printil("java.util.ArrayList _jspx_at_end = null;");
for (int i = 0; i < tagVars.length; i++) {
switch (tagVars[i].getScope()) {
case VariableInfo.NESTED:
if (!nestedSeen) {
out.printil("_jspx_nested = new java.util.ArrayList();");
nestedSeen = true;
}
out.printin("_jspx_nested.add(");
break;
case VariableInfo.AT_BEGIN:
if (!atBeginSeen) {
out.printil("_jspx_at_begin = new java.util.ArrayList();");
atBeginSeen = true;
}
out.printin("_jspx_at_begin.add(");
break;
case VariableInfo.AT_END:
if (!atEndSeen) {
out.printil("_jspx_at_end = new java.util.ArrayList();");
atEndSeen = true;
}
out.printin("_jspx_at_end.add(");
break;
} // switch
out.print(quote(tagVars[i].getNameGiven()));
out.println(");");
}
if (aliasSeen) {
out
.printil("this.jspContext = new org.apache.struts2.jasper.runtime.JspContextWrapper(ctx, _jspx_nested, _jspx_at_begin, _jspx_at_end, aliasMap);");
} else {
out
.printil("this.jspContext = new org.apache.struts2.jasper.runtime.JspContextWrapper(ctx, _jspx_nested, _jspx_at_begin, _jspx_at_end, null);");
}
out.popIndent();
out.printil("}");
out.println();
out.printil("public JspContext getJspContext() {");
out.pushIndent();
out.printil("return this.jspContext;");
out.popIndent();
out.printil("}");
}
/*
* Generates implementation of
* javax.servlet.jsp.tagext.DynamicAttributes.setDynamicAttribute() method,
* which saves each dynamic attribute that is passed in so that a scoped
* variable can later be created for it.
*/
public void generateSetDynamicAttribute() {
out
.printil("public void setDynamicAttribute(String uri, String localName, Object value) throws JspException {");
out.pushIndent();
/*
* According to the spec, only dynamic attributes with no uri are to be
* present in the Map; all other dynamic attributes are ignored.
*/
out.printil("if (uri == null)");
out.pushIndent();
out.printil("_jspx_dynamic_attrs.put(localName, value);");
out.popIndent();
out.popIndent();
out.printil("}");
}
/*
* Creates a page-scoped variable for each declared tag attribute. Also, if
* the tag accepts dynamic attributes, a page-scoped variable is made
* available for each dynamic attribute that was passed in.
*/
private void generatePageScopedVariables(JasperTagInfo tagInfo) {
// "normal" attributes
TagAttributeInfo[] attrInfos = tagInfo.getAttributes();
boolean variableMapperVar = false;
for (int i = 0; i < attrInfos.length; i++) {
String attrName = attrInfos[i].getName();
// handle assigning deferred vars to VariableMapper, storing
// previous values under '_el_ve[i]' for later re-assignment
if (attrInfos[i].isDeferredValue() || attrInfos[i].isDeferredMethod()) {
// we need to scope the modified VariableMapper for consistency and performance
if (!variableMapperVar) {
out.printil("javax.el.VariableMapper _el_variablemapper = jspContext.getELContext().getVariableMapper();");
variableMapperVar = true;
}
out.printin("javax.el.ValueExpression _el_ve");
out.print(i);
out.print(" = _el_variablemapper.setVariable(");
out.print(quote(attrName));
out.print(',');
if (attrInfos[i].isDeferredMethod()) {
out.print(VAR_EXPRESSIONFACTORY);
out.print(".createValueExpression(");
out.print(toGetterMethod(attrName));
out.print(",javax.el.MethodExpression.class)");
} else {
out.print(toGetterMethod(attrName));
}
out.println(");");
} else {
out.printil("if( " + toGetterMethod(attrName) + " != null ) ");
out.pushIndent();
out.printin("_jspx_page_context.setAttribute(");
out.print(quote(attrName));
out.print(", ");
out.print(toGetterMethod(attrName));
out.println(");");
out.popIndent();
}
}
// Expose the Map containing dynamic attributes as a page-scoped var
if (tagInfo.hasDynamicAttributes()) {
out.printin("_jspx_page_context.setAttribute(\"");
out.print(tagInfo.getDynamicAttributesMapName());
out.print("\", _jspx_dynamic_attrs);");
}
}
/*
* Generates the getter method for the given attribute name.
*/
private String toGetterMethod(String attrName) {
char[] attrChars = attrName.toCharArray();
attrChars[0] = Character.toUpperCase(attrChars[0]);
return "get" + new String(attrChars) + "()";
}
/*
* Generates the setter method name for the given attribute name.
*/
private String toSetterMethodName(String attrName) {
char[] attrChars = attrName.toCharArray();
attrChars[0] = Character.toUpperCase(attrChars[0]);
return "set" + new String(attrChars);
}
/**
* Class storing the result of introspecting a custom tag handler.
*/
private static class TagHandlerInfo {
private Hashtable methodMaps;
private Hashtable propertyEditorMaps;
private Class tagHandlerClass;
/**
* Constructor.
*
* @param n
* The custom tag whose tag handler class is to be
* introspected
* @param tagHandlerClass
* Tag handler class
* @param err
* Error dispatcher
*/
TagHandlerInfo(Node n, Class tagHandlerClass, ErrorDispatcher err)
throws JasperException {
this.tagHandlerClass = tagHandlerClass;
this.methodMaps = new Hashtable();
this.propertyEditorMaps = new Hashtable();
try {
BeanInfo tagClassInfo = Introspector
.getBeanInfo(tagHandlerClass);
PropertyDescriptor[] pd = tagClassInfo.getPropertyDescriptors();
for (int i = 0; i < pd.length; i++) {
/*
* FIXME: should probably be checking for things like
* pageContext, bodyContent, and parent here -akv
*/
if (pd[i].getWriteMethod() != null) {
methodMaps.put(pd[i].getName(), pd[i].getWriteMethod());
}
if (pd[i].getPropertyEditorClass() != null)
propertyEditorMaps.put(pd[i].getName(), pd[i]
.getPropertyEditorClass());
}
} catch (IntrospectionException ie) {
err.jspError(n, "jsp.error.introspect.taghandler",
tagHandlerClass.getName(), ie);
}
}
/**
* XXX
*/
public Method getSetterMethod(String attrName) {
return (Method) methodMaps.get(attrName);
}
/**
* XXX
*/
public Class getPropertyEditorClass(String attrName) {
return (Class) propertyEditorMaps.get(attrName);
}
/**
* XXX
*/
public Class getTagHandlerClass() {
return tagHandlerClass;
}
}
/**
* A class for generating codes to a buffer. Included here are some support
* for tracking source to Java lines mapping.
*/
private static class GenBuffer {
/*
* For a CustomTag, the codes that are generated at the beginning of the
* tag may not be in the same buffer as those for the body of the tag.
* Two fields are used here to keep this straight. For codes that do not
* corresponds to any JSP lines, they should be null.
*/
private Node node;
private Node.Nodes body;
private java.io.CharArrayWriter charWriter;
protected ServletWriter out;
GenBuffer() {
this(null, null);
}
GenBuffer(Node n, Node.Nodes b) {
node = n;
body = b;
if (body != null) {
body.setGeneratedInBuffer(true);
}
charWriter = new java.io.CharArrayWriter();
out = new ServletWriter(new java.io.PrintWriter(charWriter));
}
public ServletWriter getOut() {
return out;
}
public String toString() {
return charWriter.toString();
}
/**
* Adjust the Java Lines. This is necessary because the Java lines
* stored with the nodes are relative the beginning of this buffer and
* need to be adjusted when this buffer is inserted into the source.
*/
public void adjustJavaLines(final int offset) {
if (node != null) {
adjustJavaLine(node, offset);
}
if (body != null) {
try {
body.visit(new Node.Visitor() {
public void doVisit(Node n) {
adjustJavaLine(n, offset);
}
public void visit(Node.CustomTag n)
throws JasperException {
Node.Nodes b = n.getBody();
if (b != null && !b.isGeneratedInBuffer()) {
// Don't adjust lines for the nested tags that
// are also generated in buffers, because the
// adjustments will be done elsewhere.
b.visit(this);
}
}
});
} catch (JasperException ex) {
}
}
}
private static void adjustJavaLine(Node n, int offset) {
if (n.getBeginJavaLine() > 0) {
n.setBeginJavaLine(n.getBeginJavaLine() + offset);
n.setEndJavaLine(n.getEndJavaLine() + offset);
}
}
}
/**
* Keeps track of the generated Fragment Helper Class
*/
private static class FragmentHelperClass {
private static class Fragment {
private GenBuffer genBuffer;
private int id;
public Fragment(int id, Node node) {
this.id = id;
genBuffer = new GenBuffer(null, node.getBody());
}
public GenBuffer getGenBuffer() {
return this.genBuffer;
}
public int getId() {
return this.id;
}
}
// True if the helper class should be generated.
private boolean used = false;
private ArrayList fragments = new ArrayList();
private String className;
// Buffer for entire helper class
private GenBuffer classBuffer = new GenBuffer();
public FragmentHelperClass(String className) {
this.className = className;
}
public String getClassName() {
return this.className;
}
public boolean isUsed() {
return this.used;
}
public void generatePreamble() {
ServletWriter out = this.classBuffer.getOut();
out.println();
out.pushIndent();
// Note: cannot be static, as we need to reference things like
// _jspx_meth_*
out.printil("private class " + className);
out.printil(" extends "
+ "org.apache.struts2.jasper.runtime.JspFragmentHelper");
out.printil("{");
out.pushIndent();
out
.printil("private javax.servlet.jsp.tagext.JspTag _jspx_parent;");
out.printil("private int[] _jspx_push_body_count;");
out.println();
out.printil("public " + className
+ "( int discriminator, JspContext jspContext, "
+ "javax.servlet.jsp.tagext.JspTag _jspx_parent, "
+ "int[] _jspx_push_body_count ) {");
out.pushIndent();
out.printil("super( discriminator, jspContext, _jspx_parent );");
out.printil("this._jspx_parent = _jspx_parent;");
out.printil("this._jspx_push_body_count = _jspx_push_body_count;");
out.popIndent();
out.printil("}");
}
public Fragment openFragment(Node parent, String tagHandlerVar,
int methodNesting) throws JasperException {
Fragment result = new Fragment(fragments.size(), parent);
fragments.add(result);
this.used = true;
parent.setInnerClassName(className);
ServletWriter out = result.getGenBuffer().getOut();
out.pushIndent();
out.pushIndent();
// XXX - Returns boolean because if a tag is invoked from
// within this fragment, the Generator sometimes might
// generate code like "return true". This is ignored for now,
// meaning only the fragment is skipped. The JSR-152
// expert group is currently discussing what to do in this case.
// See comment in closeFragment()
if (methodNesting > 0) {
out.printin("public boolean invoke");
} else {
out.printin("public void invoke");
}
out.println(result.getId() + "( " + "JspWriter out ) ");
out.pushIndent();
// Note: Throwable required because methods like _jspx_meth_*
// throw Throwable.
out.printil("throws Throwable");
out.popIndent();
out.printil("{");
out.pushIndent();
generateLocalVariables(out, parent);
return result;
}
public void closeFragment(Fragment fragment, int methodNesting) {
ServletWriter out = fragment.getGenBuffer().getOut();
// XXX - See comment in openFragment()
if (methodNesting > 0) {
out.printil("return false;");
} else {
out.printil("return;");
}
out.popIndent();
out.printil("}");
}
public void generatePostamble() {
ServletWriter out = this.classBuffer.getOut();
// Generate all fragment methods:
for (int i = 0; i < fragments.size(); i++) {
Fragment fragment = (Fragment) fragments.get(i);
fragment.getGenBuffer().adjustJavaLines(out.getJavaLine() - 1);
out.printMultiLn(fragment.getGenBuffer().toString());
}
// Generate postamble:
out.printil("public void invoke( java.io.Writer writer )");
out.pushIndent();
out.printil("throws JspException");
out.popIndent();
out.printil("{");
out.pushIndent();
out.printil("JspWriter out = null;");
out.printil("if( writer != null ) {");
out.pushIndent();
out.printil("out = this.jspContext.pushBody(writer);");
out.popIndent();
out.printil("} else {");
out.pushIndent();
out.printil("out = this.jspContext.getOut();");
out.popIndent();
out.printil("}");
out.printil("try {");
out.pushIndent();
out.printil("this.jspContext.getELContext().putContext(JspContext.class,this.jspContext);");
out.printil("switch( this.discriminator ) {");
out.pushIndent();
for (int i = 0; i < fragments.size(); i++) {
out.printil("case " + i + ":");
out.pushIndent();
out.printil("invoke" + i + "( out );");
out.printil("break;");
out.popIndent();
}
out.popIndent();
out.printil("}"); // switch
out.popIndent();
out.printil("}"); // try
out.printil("catch( Throwable e ) {");
out.pushIndent();
out.printil("if (e instanceof SkipPageException)");
out.printil(" throw (SkipPageException) e;");
out.printil("throw new JspException( e );");
out.popIndent();
out.printil("}"); // catch
out.printil("finally {");
out.pushIndent();
out.printil("if( writer != null ) {");
out.pushIndent();
out.printil("this.jspContext.popBody();");
out.popIndent();
out.printil("}");
out.popIndent();
out.printil("}"); // finally
out.popIndent();
out.printil("}"); // invoke method
out.popIndent();
out.printil("}"); // helper class
out.popIndent();
}
public String toString() {
return classBuffer.toString();
}
public void adjustJavaLines(int offset) {
for (int i = 0; i < fragments.size(); i++) {
Fragment fragment = (Fragment) fragments.get(i);
fragment.getGenBuffer().adjustJavaLines(offset);
}
}
}
}
Other Struts examples (source code examples)
Here is a short list of links related to this Struts Generator.java source code file:
|
The search page
Other Struts source code examples at this package level
Click here to learn more about this project
