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Tomcat example source code file (JspUtil.java)

This example Tomcat source code file (JspUtil.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.

Java - Tomcat tags/keywords

class, errordispatcher, errordispatcher, inputstreamreader, io, ioexception, jar, jasperexception, jasperexception, jsp, node, sax, servlet, string, string, stringbuffer, stringbuffer, validattribute, vector, zip

The Tomcat JspUtil.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.jasper.compiler;

import java.io.CharArrayWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.Vector;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;

import javax.el.FunctionMapper;
import javax.servlet.jsp.el.ExpressionEvaluator;


import org.apache.el.ExpressionFactoryImpl;
import org.apache.jasper.Constants;
import org.apache.jasper.JasperException;
import org.apache.jasper.JspCompilationContext;
import org.apache.jasper.el.ExpressionEvaluatorImpl;
import org.xml.sax.Attributes;

/** 
 * This class has all the utility method(s).
 * Ideally should move all the bean containers here.
 *
 * @author Mandar Raje.
 * @author Rajiv Mordani.
 * @author Danno Ferrin
 * @author Pierre Delisle
 * @author Shawn Bayern
 * @author Mark Roth
 */
public class JspUtil {

    private static final String WEB_INF_TAGS = "/WEB-INF/tags/";
    private static final String META_INF_TAGS = "/META-INF/tags/";

    // Delimiters for request-time expressions (JSP and XML syntax)
    private static final String OPEN_EXPR  = "<%=";
    private static final String CLOSE_EXPR = "%>";
    private static final String OPEN_EXPR_XML  = "%=";
    private static final String CLOSE_EXPR_XML = "%";

    private static int tempSequenceNumber = 0;
    
    //private static ExpressionEvaluatorImpl expressionEvaluator
    //= new ExpressionEvaluatorImpl();
    
    //tc6
    private final static ExpressionEvaluator expressionEvaluator =
        new ExpressionEvaluatorImpl(new ExpressionFactoryImpl());

    private static final String javaKeywords[] = {
        "abstract", "assert", "boolean", "break", "byte", "case",
        "catch", "char", "class", "const", "continue",
        "default", "do", "double", "else", "enum", "extends",
        "final", "finally", "float", "for", "goto",
        "if", "implements", "import", "instanceof", "int",
        "interface", "long", "native", "new", "package",
        "private", "protected", "public", "return", "short",
        "static", "strictfp", "super", "switch", "synchronized",
        "this", "throws", "transient", "try", "void",
        "volatile", "while" };

    public static final int CHUNKSIZE = 1024;
        
    public static char[] removeQuotes(char []chars) {
        CharArrayWriter caw = new CharArrayWriter();
        for (int i = 0; i < chars.length; i++) {
            if (chars[i] == '%' && chars[i+1] == '\\' &&
                chars[i+2] == '>') {
                caw.write('%');
                caw.write('>');
                i = i + 2;
            } else {
                caw.write(chars[i]);
            }
        }
        return caw.toCharArray();
    }

    public static char[] escapeQuotes (char []chars) {
        // Prescan to convert %\> to %>
        String s = new String(chars);
        while (true) {
            int n = s.indexOf("%\\>");
            if (n < 0)
                break;
            StringBuffer sb = new StringBuffer(s.substring(0, n));
            sb.append("%>");
            sb.append(s.substring(n + 3));
            s = sb.toString();
        }
        chars = s.toCharArray();
        return (chars);


        // Escape all backslashes not inside a Java string literal
        /*
        CharArrayWriter caw = new CharArrayWriter();
        boolean inJavaString = false;
        for (int i = 0; i < chars.length; i++) {
            if (chars[i] == '"') inJavaString = !inJavaString;
            // escape out the escape character
            if (!inJavaString && (chars[i] == '\\')) caw.write('\\');
            caw.write(chars[i]);
        }
        return caw.toCharArray();
        */
    }

    /**
     * Checks if the token is a runtime expression.
     * In standard JSP syntax, a runtime expression starts with '<%' and
     * ends with '%>'. When the JSP document is in XML syntax, a runtime
     * expression starts with '%=' and ends with '%'.
     *
     * @param token The token to be checked
     * return whether the token is a runtime expression or not.
     */
    public static boolean isExpression(String token, boolean isXml) {
    String openExpr;
    String closeExpr;
    if (isXml) {
        openExpr = OPEN_EXPR_XML;
        closeExpr = CLOSE_EXPR_XML;
    } else {
        openExpr = OPEN_EXPR;
        closeExpr = CLOSE_EXPR;
    }
    if (token.startsWith(openExpr) && token.endsWith(closeExpr)) {
        return true;
    } else {
        return false;
    }
    }

    /**
     * @return the "expression" part of a runtime expression, 
     * taking the delimiters out.
     */
    public static String getExpr (String expression, boolean isXml) {
    String returnString;
    String openExpr;
    String closeExpr;
    if (isXml) {
        openExpr = OPEN_EXPR_XML;
        closeExpr = CLOSE_EXPR_XML;
    } else {
        openExpr = OPEN_EXPR;
        closeExpr = CLOSE_EXPR;
    }
    int length = expression.length();
    if (expression.startsWith(openExpr) && 
                expression.endsWith(closeExpr)) {
        returnString = expression.substring(
                               openExpr.length(), length - closeExpr.length());
    } else {
        returnString = "";
    }
    return returnString;
    }

    /**
     * Takes a potential expression and converts it into XML form
     */
    public static String getExprInXml(String expression) {
        String returnString;
        int length = expression.length();

        if (expression.startsWith(OPEN_EXPR) 
                && expression.endsWith(CLOSE_EXPR)) {
            returnString = expression.substring (1, length - 1);
        } else {
            returnString = expression;
        }

        return escapeXml(returnString.replace(Constants.ESC, '$'));
    }

    /**
     * Checks to see if the given scope is valid.
     *
     * @param scope The scope to be checked
     * @param n The Node containing the 'scope' attribute whose value is to be
     * checked
     * @param err error dispatcher
     *
     * @throws JasperException if scope is not null and different from
     * "page", "request", "session", and
     * "application"
     */
    public static void checkScope(String scope, Node n, ErrorDispatcher err)
            throws JasperException {
    if (scope != null && !scope.equals("page") && !scope.equals("request")
        && !scope.equals("session") && !scope.equals("application")) {
        err.jspError(n, "jsp.error.invalid.scope", scope);
    }
    }

    /**
     * Checks if all mandatory attributes are present and if all attributes
     * present have valid names.  Checks attributes specified as XML-style
     * attributes as well as attributes specified using the jsp:attribute
     * standard action. 
     */
    public static void checkAttributes(String typeOfTag,
                       Node n,
                       ValidAttribute[] validAttributes,
                       ErrorDispatcher err)
                throws JasperException {
        Attributes attrs = n.getAttributes();
        Mark start = n.getStart();
    boolean valid = true;

        // AttributesImpl.removeAttribute is broken, so we do this...
        int tempLength = (attrs == null) ? 0 : attrs.getLength();
    Vector temp = new Vector(tempLength, 1);
        for (int i = 0; i < tempLength; i++) {
            String qName = attrs.getQName(i);
            if ((!qName.equals("xmlns")) && (!qName.startsWith("xmlns:")))
                temp.addElement(qName);
        }

        // Add names of attributes specified using jsp:attribute
        Node.Nodes tagBody = n.getBody();
        if( tagBody != null ) {
            int numSubElements = tagBody.size();
            for( int i = 0; i < numSubElements; i++ ) {
                Node node = tagBody.getNode( i );
                if( node instanceof Node.NamedAttribute ) {
                    String attrName = node.getAttributeValue( "name" );
                    temp.addElement( attrName );
            // Check if this value appear in the attribute of the node
            if (n.getAttributeValue(attrName) != null) {
            err.jspError(n, "jsp.error.duplicate.name.jspattribute",
                    attrName);
            }
                }
                else {
                    // Nothing can come before jsp:attribute, and only
                    // jsp:body can come after it.
                    break;
                }
            }
        }

    /*
     * First check to see if all the mandatory attributes are present.
     * If so only then proceed to see if the other attributes are valid
     * for the particular tag.
     */
    String missingAttribute = null;

    for (int i = 0; i < validAttributes.length; i++) {
        int attrPos;    
        if (validAttributes[i].mandatory) {
                attrPos = temp.indexOf(validAttributes[i].name);
        if (attrPos != -1) {
            temp.remove(attrPos);
            valid = true;
        } else {
            valid = false;
            missingAttribute = validAttributes[i].name;
            break;
        }
        }
    }

    // If mandatory attribute is missing then the exception is thrown
    if (!valid)
        err.jspError(start, "jsp.error.mandatory.attribute", typeOfTag,
             missingAttribute);

    // Check to see if there are any more attributes for the specified tag.
        int attrLeftLength = temp.size();
    if (attrLeftLength == 0)
        return;

    // Now check to see if the rest of the attributes are valid too.
    String attribute = null;

    for (int j = 0; j < attrLeftLength; j++) {
        valid = false;
        attribute = (String) temp.elementAt(j);
        for (int i = 0; i < validAttributes.length; i++) {
        if (attribute.equals(validAttributes[i].name)) {
            valid = true;
            break;
        }
        }
        if (!valid)
        err.jspError(start, "jsp.error.invalid.attribute", typeOfTag,
                 attribute);
    }
    // XXX *could* move EL-syntax validation here... (sb)
    }
    
    public static String escapeQueryString(String unescString) {
    if ( unescString == null )
        return null;
    
    String escString    = "";
    String shellSpChars = "\\\"";
    
    for(int index=0; index<unescString.length(); index++) {
        char nextChar = unescString.charAt(index);
        
        if( shellSpChars.indexOf(nextChar) != -1 )
        escString += "\\";
        
        escString += nextChar;
    }
    return escString;
    }
 
    /**
     *  Escape the 5 entities defined by XML.
     */
    public static String escapeXml(String s) {
        if (s == null) return null;
        StringBuffer sb = new StringBuffer();
        for(int i=0; i<s.length(); i++) {
            char c = s.charAt(i);
            if (c == '<') {
                sb.append("<");
            } else if (c == '>') {
                sb.append(">");
            } else if (c == '\'') {
                sb.append("'");
            } else if (c == '&') {
                sb.append("&");
            } else if (c == '"') {
                sb.append(""");
            } else {
                sb.append(c);
            }
        }
        return sb.toString();
    }

    /**
     * Replaces any occurrences of the character <tt>replace with the
     * string <tt>with.
     */
    public static String replace(String name, char replace, String with) {
    StringBuffer buf = new StringBuffer();
    int begin = 0;
    int end;
    int last = name.length();

    while (true) {
        end = name.indexOf(replace, begin);
        if (end < 0) {
        end = last;
        }
        buf.append(name.substring(begin, end));
        if (end == last) {
        break;
        }
        buf.append(with);
        begin = end + 1;
    }
    
    return buf.toString();
    }

    public static class ValidAttribute {
    String name;
    boolean mandatory;
    boolean rtexprvalue;    // not used now

    public ValidAttribute (String name, boolean mandatory,
            boolean rtexprvalue )
        {
        this.name = name;
        this.mandatory = mandatory;
            this.rtexprvalue = rtexprvalue;
        }

       public ValidAttribute (String name, boolean mandatory) {
            this( name, mandatory, false );
    }

    public ValidAttribute (String name) {
        this (name, false);
    }
    }
    
    /**
     * Convert a String value to 'boolean'.
     * Besides the standard conversions done by
     * Boolean.valueOf(s).booleanValue(), the value "yes"
     * (ignore case) is also converted to 'true'. 
     * If 's' is null, then 'false' is returned.
     *
     * @param s the string to be converted
     * @return the boolean value associated with the string s
     */
    public static boolean booleanValue(String s) {
    boolean b = false;
    if (s != null) {
        if (s.equalsIgnoreCase("yes")) {
        b = true;
        } else {
        b = Boolean.valueOf(s).booleanValue();
        }
    }
    return b;
    }

    /**
     * Returns the <tt>Class object associated with the class or
     * interface with the given string name.
     *
     * <p> The Class object is determined by passing the given string
     * name to the <tt>Class.forName() method, unless the given string
     * name represents a primitive type, in which case it is converted to a
     * <tt>Class object by appending ".class" to it (e.g., "int.class").
     */
    public static Class toClass(String type, ClassLoader loader)
        throws ClassNotFoundException {

    Class c = null;
    int i0 = type.indexOf('[');
    int dims = 0;
    if (i0 > 0) {
        // This is an array.  Count the dimensions
        for (int i = 0; i < type.length(); i++) {
        if (type.charAt(i) == '[')
            dims++;
        }
        type = type.substring(0, i0);
    }

    if ("boolean".equals(type))
        c = boolean.class;
    else if ("char".equals(type))
        c = char.class;
    else if ("byte".equals(type))
        c =  byte.class;
    else if ("short".equals(type))
        c = short.class;
    else if ("int".equals(type))
        c = int.class;
    else if ("long".equals(type))
        c = long.class;
    else if ("float".equals(type))
        c = float.class;
    else if ("double".equals(type))
        c = double.class;
    else if (type.indexOf('[') < 0)
        c = loader.loadClass(type);

    if (dims == 0)
        return c;

    if (dims == 1)
        return java.lang.reflect.Array.newInstance(c, 1).getClass();

    // Array of more than i dimension
    return java.lang.reflect.Array.newInstance(c, new int[dims]).getClass();
    }
    
    /**
     * Produces a String representing a call to the EL interpreter.
     * @param expression a String containing zero or more "${}" expressions
     * @param expectedType the expected type of the interpreted result
     * @param fnmapvar Variable pointing to a function map.
     * @param XmlEscape True if the result should do XML escaping
     * @return a String representing a call to the EL interpreter.
     */
    public static String interpreterCall(boolean isTagFile,
                     String expression,
                                         Class expectedType,
                                         String fnmapvar,
                                         boolean XmlEscape ) 
    {
        /*
         * Determine which context object to use.
         */
    String jspCtxt = null;
    if (isTagFile)
        jspCtxt = "this.getJspContext()";
    else
        jspCtxt = "_jspx_page_context";

    /*
         * Determine whether to use the expected type's textual name
     * or, if it's a primitive, the name of its correspondent boxed
     * type.
         */
    String targetType = expectedType.getName();
    String primitiveConverterMethod = null;
    if (expectedType.isPrimitive()) {
        if (expectedType.equals(Boolean.TYPE)) {
        targetType = Boolean.class.getName();
        primitiveConverterMethod = "booleanValue";
        } else if (expectedType.equals(Byte.TYPE)) {
        targetType = Byte.class.getName();
        primitiveConverterMethod = "byteValue";
        } else if (expectedType.equals(Character.TYPE)) {
        targetType = Character.class.getName();
        primitiveConverterMethod = "charValue";
        } else if (expectedType.equals(Short.TYPE)) {
        targetType = Short.class.getName();
        primitiveConverterMethod = "shortValue";
        } else if (expectedType.equals(Integer.TYPE)) {
        targetType = Integer.class.getName();
        primitiveConverterMethod = "intValue";
        } else if (expectedType.equals(Long.TYPE)) {
        targetType = Long.class.getName();
        primitiveConverterMethod = "longValue";
        } else if (expectedType.equals(Float.TYPE)) {
        targetType = Float.class.getName();
        primitiveConverterMethod = "floatValue";
        } else if (expectedType.equals(Double.TYPE)) { 
        targetType = Double.class.getName();
        primitiveConverterMethod = "doubleValue";
        }
    }
 
    if (primitiveConverterMethod != null) {
        XmlEscape = false;
    }

    /*
         * Build up the base call to the interpreter.
         */
        // XXX - We use a proprietary call to the interpreter for now
        // as the current standard machinery is inefficient and requires
        // lots of wrappers and adapters.  This should all clear up once
        // the EL interpreter moves out of JSTL and into its own project.
        // In the future, this should be replaced by code that calls
        // ExpressionEvaluator.parseExpression() and then cache the resulting
        // expression objects.  The interpreterCall would simply select
        // one of the pre-cached expressions and evaluate it.
        // Note that PageContextImpl implements VariableResolver and
        // the generated Servlet/SimpleTag implements FunctionMapper, so
        // that machinery is already in place (mroth).
    targetType = toJavaSourceType(targetType);
    StringBuffer call = new StringBuffer(
             "(" + targetType + ") "
               + "org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate"
               + "(" + Generator.quote(expression) + ", "
               +       targetType + ".class, "
           +       "(PageContext)" + jspCtxt 
               +       ", " + fnmapvar
           + ", " + XmlEscape
               + ")");
 
    /*
         * Add the primitive converter method if we need to.
         */
    if (primitiveConverterMethod != null) {
        call.insert(0, "(");
        call.append(")." + primitiveConverterMethod + "()");
    }
 
    return call.toString();
    }

    /**
     * Validates the syntax of all ${} expressions within the given string.
     * @param where the approximate location of the expressions in the JSP page
     * @param expressions a string containing zero or more "${}" expressions
     * @param err an error dispatcher to use
     * @deprecated now delegated to the org.apache.el Package
     */
    public static void validateExpressions(Mark where,
                                           String expressions,
                                           Class expectedType,
                                           FunctionMapper functionMapper,
                                           ErrorDispatcher err)
            throws JasperException {

//        try {
//            
//            JspUtil.expressionEvaluator.parseExpression( expressions, 
//                expectedType, functionMapper );
//        }
//        catch( ELParseException e ) {
//            err.jspError(where, "jsp.error.invalid.expression", expressions,
//                e.toString() );
//        }
//        catch( ELException e ) {
//            err.jspError(where, "jsp.error.invalid.expression", expressions,
//                e.toString() );
//        }
    }

    /**
     * Resets the temporary variable name.
     * (not thread-safe)
     */
    public static void resetTemporaryVariableName() {
        tempSequenceNumber = 0;
    }

    /**
     * Generates a new temporary variable name.
     * (not thread-safe)
     */
    public static String nextTemporaryVariableName() {
        return Constants.TEMP_VARIABLE_NAME_PREFIX + (tempSequenceNumber++);
    }

    public static String coerceToPrimitiveBoolean(String s,
                          boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToBoolean(" + s + ")";
    } else {
        if (s == null || s.length() == 0)
        return "false";
        else
        return Boolean.valueOf(s).toString();
    }
    }

    public static String coerceToBoolean(String s, boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "(Boolean) org.apache.jasper.runtime.JspRuntimeLibrary.coerce(" + s + ", Boolean.class)";
    } else {
        if (s == null || s.length() == 0) {
        return "new Boolean(false)";
        } else {
        // Detect format error at translation time
        return "new Boolean(" + Boolean.valueOf(s).toString() + ")";
        }
    }
    }

    public static String coerceToPrimitiveByte(String s,
                           boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToByte(" + s + ")";
    } else {
        if (s == null || s.length() == 0)
        return "(byte) 0";
        else
        return "((byte)" + Byte.valueOf(s).toString() + ")";
    }
    }

    public static String coerceToByte(String s, boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "(Byte) org.apache.jasper.runtime.JspRuntimeLibrary.coerce(" + s + ", Byte.class)";
    } else {
        if (s == null || s.length() == 0) {
        return "new Byte((byte) 0)";
        } else {
        // Detect format error at translation time
        return "new Byte((byte)" + Byte.valueOf(s).toString() + ")";
        }
    }
    }

    public static String coerceToChar(String s, boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToChar(" + s + ")";
    } else {
        if (s == null || s.length() == 0) {
        return "(char) 0";
        } else {
        char ch = s.charAt(0);
        // this trick avoids escaping issues
        return "((char) " + (int) ch + ")";
        }
    }
    }

    public static String coerceToCharacter(String s, boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "(Character) org.apache.jasper.runtime.JspRuntimeLibrary.coerce(" + s + ", Character.class)";
    } else {
        if (s == null || s.length() == 0) {
        return "new Character((char) 0)";
        } else {
        char ch = s.charAt(0);
        // this trick avoids escaping issues
        return "new Character((char) " + (int) ch + ")";
        }
    }
    }

    public static String coerceToPrimitiveDouble(String s,
                         boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToDouble(" + s + ")";
    } else {
        if (s == null || s.length() == 0)
        return "(double) 0";
        else
        return Double.valueOf(s).toString();
    }
    }

    public static String coerceToDouble(String s, boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "(Double) org.apache.jasper.runtime.JspRuntimeLibrary.coerce(" + s + ", Double.class)";
    } else {
        if (s == null || s.length() == 0) {
        return "new Double(0)";
        } else {
        // Detect format error at translation time
        return "new Double(" + Double.valueOf(s).toString() + ")";
        }
    }
    }

    public static String coerceToPrimitiveFloat(String s,
                        boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToFloat(" + s + ")";
    } else {
        if (s == null || s.length() == 0)
        return "(float) 0";
        else
        return Float.valueOf(s).toString() + "f";
    }
    }

    public static String coerceToFloat(String s, boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "(Float) org.apache.jasper.runtime.JspRuntimeLibrary.coerce(" + s + ", Float.class)";
    } else {
        if (s == null || s.length() == 0) {
        return "new Float(0)";
        } else {
        // Detect format error at translation time
        return "new Float(" + Float.valueOf(s).toString() + "f)";
        }
    }
    }

    public static String coerceToInt(String s, boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToInt(" + s + ")";
    } else {
        if (s == null || s.length() == 0)
        return "0";
        else
        return Integer.valueOf(s).toString();
    }
    }

    public static String coerceToInteger(String s, boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "(Integer) org.apache.jasper.runtime.JspRuntimeLibrary.coerce(" + s + ", Integer.class)";
    } else {
        if (s == null || s.length() == 0) {
        return "new Integer(0)";
        } else {
        // Detect format error at translation time
        return "new Integer(" + Integer.valueOf(s).toString() + ")";
        }
    }
    }

    public static String coerceToPrimitiveShort(String s,
                        boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToShort(" + s + ")";
    } else {
        if (s == null || s.length() == 0)
        return "(short) 0";
        else
        return "((short) " + Short.valueOf(s).toString() + ")";
    }
    }
    
    public static String coerceToShort(String s, boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "(Short) org.apache.jasper.runtime.JspRuntimeLibrary.coerce(" + s + ", Short.class)";
    } else {
        if (s == null || s.length() == 0) {
        return "new Short((short) 0)";
        } else {
        // Detect format error at translation time
        return "new Short(\"" + Short.valueOf(s).toString() + "\")";
        }
    }
    }
    
    public static String coerceToPrimitiveLong(String s,
                           boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToLong(" + s + ")";
    } else {
        if (s == null || s.length() == 0)
        return "(long) 0";
        else
        return Long.valueOf(s).toString() + "l";
    }
    }

    public static String coerceToLong(String s, boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "(Long) org.apache.jasper.runtime.JspRuntimeLibrary.coerce(" + s + ", Long.class)";
    } else {
        if (s == null || s.length() == 0) {
        return "new Long(0)";
        } else {
        // Detect format error at translation time
        return "new Long(" + Long.valueOf(s).toString() + "l)";
        }
    }
    }

    public static InputStream getInputStream(String fname, JarFile jarFile,
                         JspCompilationContext ctxt,
                         ErrorDispatcher err)
        throws JasperException, IOException {

        InputStream in = null;

    if (jarFile != null) {
        String jarEntryName = fname.substring(1, fname.length());
        ZipEntry jarEntry = jarFile.getEntry(jarEntryName);
        if (jarEntry == null) {
        err.jspError("jsp.error.file.not.found", fname);
        }
        in = jarFile.getInputStream(jarEntry);
    } else {
        in = ctxt.getResourceAsStream(fname);
    }

    if (in == null) {
        err.jspError("jsp.error.file.not.found", fname);
    }

    return in;
    }

    /**
     * Gets the fully-qualified class name of the tag handler corresponding to
     * the given tag file path.
     *
     * @param path Tag file path
     * @param err Error dispatcher
     *
     * @return Fully-qualified class name of the tag handler corresponding to 
     * the given tag file path
     */
    public static String getTagHandlerClassName(String path,
                        ErrorDispatcher err)
                throws JasperException {

        String className = null;
        int begin = 0;
        int index;
        
        index = path.lastIndexOf(".tag");
        if (index == -1) {
            err.jspError("jsp.error.tagfile.badSuffix", path);
        }

        //It's tempting to remove the ".tag" suffix here, but we can't.
        //If we remove it, the fully-qualified class name of this tag
        //could conflict with the package name of other tags.
        //For instance, the tag file
        //    /WEB-INF/tags/foo.tag
        //would have fully-qualified class name
        //    org.apache.jsp.tag.web.foo
        //which would conflict with the package name of the tag file
        //    /WEB-INF/tags/foo/bar.tag

        index = path.indexOf(WEB_INF_TAGS);
        if (index != -1) {
            className = "org.apache.jsp.tag.web.";
            begin = index + WEB_INF_TAGS.length();
        } else {
        index = path.indexOf(META_INF_TAGS);
        if (index != -1) {
        className = "org.apache.jsp.tag.meta.";
        begin = index + META_INF_TAGS.length();
        } else {
        err.jspError("jsp.error.tagfile.illegalPath", path);
        }
    }

        className += makeJavaPackage(path.substring(begin));
  
       return className;
    }

    /**
     * Converts the given path to a Java package or fully-qualified class name
     *
     * @param path Path to convert
     *
     * @return Java package corresponding to the given path
     */
    public static final String makeJavaPackage(String path) {
        String classNameComponents[] = split(path,"/");
        StringBuffer legalClassNames = new StringBuffer();
        for (int i = 0; i < classNameComponents.length; i++) {
            legalClassNames.append(makeJavaIdentifier(classNameComponents[i]));
            if (i < classNameComponents.length - 1) {
                legalClassNames.append('.');
            }
        }
        return legalClassNames.toString();
    }

    /**
     * Splits a string into it's components.
     * @param path String to split
     * @param pat Pattern to split at
     * @return the components of the path
     */
    private static final String [] split(String path, String pat) {
        Vector comps = new Vector();
        int pos = path.indexOf(pat);
        int start = 0;
        while( pos >= 0 ) {
            if(pos > start ) {
                String comp = path.substring(start,pos);
                comps.add(comp);
            }
            start = pos + pat.length();
            pos = path.indexOf(pat,start);
        }
        if( start < path.length()) {
            comps.add(path.substring(start));
        }
        String [] result = new String[comps.size()];
        for(int i=0; i < comps.size(); i++) {
            result[i] = (String)comps.elementAt(i);
        }
        return result;
    }
            
    /**
     * Converts the given identifier to a legal Java identifier
     *
     * @param identifier Identifier to convert
     *
     * @return Legal Java identifier corresponding to the given identifier
     */
    public static final String makeJavaIdentifier(String identifier) {
        StringBuffer modifiedIdentifier = 
            new StringBuffer(identifier.length());
        if (!Character.isJavaIdentifierStart(identifier.charAt(0))) {
            modifiedIdentifier.append('_');
        }
        for (int i = 0; i < identifier.length(); i++) {
            char ch = identifier.charAt(i);
            if (Character.isJavaIdentifierPart(ch) && ch != '_') {
                modifiedIdentifier.append(ch);
            } else if (ch == '.') {
                modifiedIdentifier.append('_');
            } else {
                modifiedIdentifier.append(mangleChar(ch));
            }
        }
        if (isJavaKeyword(modifiedIdentifier.toString())) {
            modifiedIdentifier.append('_');
        }
        return modifiedIdentifier.toString();
    }
    
    /**
     * Mangle the specified character to create a legal Java class name.
     */
    public static final String mangleChar(char ch) {
        char[] result = new char[5];
        result[0] = '_';
        result[1] = Character.forDigit((ch >> 12) & 0xf, 16);
        result[2] = Character.forDigit((ch >> 8) & 0xf, 16);
        result[3] = Character.forDigit((ch >> 4) & 0xf, 16);
        result[4] = Character.forDigit(ch & 0xf, 16);
        return new String(result);
    }

    /**
     * Test whether the argument is a Java keyword
     */
    public static boolean isJavaKeyword(String key) {
        int i = 0;
        int j = javaKeywords.length;
        while (i < j) {
            int k = (i+j)/2;
            int result = javaKeywords[k].compareTo(key);
            if (result == 0) {
                return true;
            }
            if (result < 0) {
                i = k+1;
            } else {
                j = k;
            }
        }
        return false;
    }

    /**
     * Converts the given Xml name to a legal Java identifier.  This is
     * slightly more efficient than makeJavaIdentifier in that we only need
     * to worry about '.', '-', and ':' in the string.  We also assume that
     * the resultant string is further concatenated with some prefix string
     * so that we don't have to worry about it being a Java key word.
     *
     * @param name Identifier to convert
     *
     * @return Legal Java identifier corresponding to the given identifier
     */
    public static final String makeXmlJavaIdentifier(String name) {
        if (name.indexOf('-') >= 0)
            name = replace(name, '-', "$1");
        if (name.indexOf('.') >= 0)
            name = replace(name, '.', "$2");
        if (name.indexOf(':') >= 0)
            name = replace(name, ':', "$3");
        return name;
    }

    static InputStreamReader getReader(String fname, String encoding,
            JarFile jarFile,
            JspCompilationContext ctxt,
            ErrorDispatcher err)
    throws JasperException, IOException {

        return getReader(fname, encoding, jarFile, ctxt, err, 0);
    }

    static InputStreamReader getReader(String fname, String encoding,
            JarFile jarFile,
            JspCompilationContext ctxt,
            ErrorDispatcher err, int skip)
    throws JasperException, IOException {

        InputStreamReader reader = null;
        InputStream in = getInputStream(fname, jarFile, ctxt, err);
        for (int i = 0; i < skip; i++) {
            in.read();
        }
        try {
            reader = new InputStreamReader(in, encoding);
        } catch (UnsupportedEncodingException ex) {
            err.jspError("jsp.error.unsupported.encoding", encoding);
        }

        return reader;
    }
    
    /**
     * Handles taking input from TLDs
     * 'java.lang.Object' -> 'java.lang.Object.class'
     * 'int' -> 'int.class'
     * 'void' -> 'Void.TYPE'
     * 'int[]' -> 'int[].class'
     * 
     * @param type
     * @return
     */
    public static String toJavaSourceTypeFromTld(String type) {
        if (type == null || "void".equals(type)) {
            return "Void.TYPE";
        }
        return type + ".class";
    }

    /**
     * Class.getName() return arrays in the form "[[[<et>", where et,
     * the element type can be one of ZBCDFIJS or L<classname>;
     * It is converted into forms that can be understood by javac.
     */
    public static String toJavaSourceType(String type) {

    if (type.charAt(0) != '[') {
        return type;
    }

    int dims = 1;
    String t = null;
    for (int i = 1; i < type.length(); i++) {
        if (type.charAt(i) == '[') {
        dims++;
        } else {
        switch (type.charAt(i)) {
        case 'Z': t = "boolean"; break;
        case 'B': t = "byte"; break;
        case 'C': t = "char"; break;
        case 'D': t = "double"; break;
        case 'F': t = "float"; break;
        case 'I': t = "int"; break;
        case 'J': t = "long"; break;
        case 'S': t = "short"; break;
        case 'L': t = type.substring(i+1, type.indexOf(';')); break;
        }
        break;
        }
    }
    StringBuffer resultType = new StringBuffer(t);
    for (; dims > 0; dims--) {
        resultType.append("[]");
    }
    return resultType.toString();
    }

    /**
     * Compute the canonical name from a Class instance.  Note that a
     * simple replacment of '$' with '.' of a binary name would not work,
     * as '$' is a legal Java Identifier character.
     * @param c A instance of java.lang.Class
     * @return  The canonical name of c.
     */
    public static String getCanonicalName(Class c) {

        String binaryName = c.getName();
        c = c.getDeclaringClass();

        if (c == null) {
            return binaryName;
        }

        StringBuffer buf = new StringBuffer(binaryName);
        do {
            buf.setCharAt(c.getName().length(), '.');
            c = c.getDeclaringClass();
        } while ( c != null);

        return buf.toString();
    }
}

Other Tomcat examples (source code examples)

Here is a short list of links related to this Tomcat JspUtil.java source code file:

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