Java example source code file (AbstractTranslet.java)
The AbstractTranslet.java Java example source code/*
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* DO NOT REMOVE OR ALTER!
*/
/*
* Copyright 2001-2004 The Apache Software Foundation.
*
* Licensed 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.
*/
/*
* $Id: AbstractTranslet.java,v 1.6 2006/06/19 19:49:03 spericas Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.runtime;
import com.sun.org.apache.xalan.internal.XalanConstants;
import com.sun.org.apache.xalan.internal.utils.FactoryImpl;
import java.io.File;
import java.io.FileOutputStream;
import java.io.BufferedOutputStream;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Vector;
import javax.xml.transform.Templates;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.DOMImplementation;
import javax.xml.parsers.ParserConfigurationException;
import com.sun.org.apache.xml.internal.dtm.DTM;
import com.sun.org.apache.xalan.internal.xsltc.DOM;
import com.sun.org.apache.xalan.internal.xsltc.DOMCache;
import com.sun.org.apache.xalan.internal.xsltc.DOMEnhancedForDTM;
import com.sun.org.apache.xalan.internal.xsltc.Translet;
import com.sun.org.apache.xalan.internal.xsltc.TransletException;
import com.sun.org.apache.xalan.internal.xsltc.dom.DOMAdapter;
import com.sun.org.apache.xalan.internal.xsltc.dom.KeyIndex;
import com.sun.org.apache.xalan.internal.xsltc.runtime.output.TransletOutputHandlerFactory;
import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
import com.sun.org.apache.xml.internal.serializer.SerializationHandler;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
* @author Morten Jorgensen
* @author G. Todd Miller
* @author John Howard, JohnH@schemasoft.com
*/
public abstract class AbstractTranslet implements Translet {
// These attributes are extracted from the xsl:output element. They also
// appear as fields (with the same type, only public) in Output.java
public String _version = "1.0";
public String _method = null;
public String _encoding = "UTF-8";
public boolean _omitHeader = false;
public String _standalone = null;
//see OutputPropertiesFactory.ORACLE_IS_STANDALONE
public boolean _isStandalone = false;
public String _doctypePublic = null;
public String _doctypeSystem = null;
public boolean _indent = false;
public String _mediaType = null;
public Vector _cdata = null;
public int _indentamount = -1;
public static final int FIRST_TRANSLET_VERSION = 100;
public static final int VER_SPLIT_NAMES_ARRAY = 101;
public static final int CURRENT_TRANSLET_VERSION = VER_SPLIT_NAMES_ARRAY;
// Initialize Translet version field to base value. A class that extends
// AbstractTranslet may override this value to a more recent translet
// version; if it doesn't override the value (because it was compiled
// before the notion of a translet version was introduced, it will get
// this default value).
protected int transletVersion = FIRST_TRANSLET_VERSION;
// DOM/translet handshaking - the arrays are set by the compiled translet
protected String[] namesArray;
protected String[] urisArray;
protected int[] typesArray;
protected String[] namespaceArray;
// The Templates object that is used to create this Translet instance
protected Templates _templates = null;
// Boolean flag to indicate whether this translet has id functions.
protected boolean _hasIdCall = false;
// TODO - these should only be instanciated when needed
protected StringValueHandler stringValueHandler = new StringValueHandler();
// Use one empty string instead of constantly instanciating String("");
private final static String EMPTYSTRING = "";
// This is the name of the index used for ID attributes
private final static String ID_INDEX_NAME = "##id";
private boolean _useServicesMechanism;
/**
* protocols allowed for external references set by the stylesheet processing instruction, Document() function, Import and Include element.
*/
private String _accessExternalStylesheet = XalanConstants.EXTERNAL_ACCESS_DEFAULT;
/************************************************************************
* Debugging
************************************************************************/
public void printInternalState() {
System.out.println("-------------------------------------");
System.out.println("AbstractTranslet this = " + this);
System.out.println("pbase = " + pbase);
System.out.println("vframe = " + pframe);
System.out.println("paramsStack.size() = " + paramsStack.size());
System.out.println("namesArray.size = " + namesArray.length);
System.out.println("namespaceArray.size = " + namespaceArray.length);
System.out.println("");
System.out.println("Total memory = " + Runtime.getRuntime().totalMemory());
}
/**
* Wrap the initial input DOM in a dom adapter. This adapter is wrapped in
* a DOM multiplexer if the document() function is used (handled by compiled
* code in the translet - see compiler/Stylesheet.compileTransform()).
*/
public final DOMAdapter makeDOMAdapter(DOM dom)
throws TransletException {
setRootForKeys(dom.getDocument());
return new DOMAdapter(dom, namesArray, urisArray, typesArray, namespaceArray);
}
/************************************************************************
* Parameter handling
************************************************************************/
// Parameter's stack: <tt>pbase and pframe are used
// to denote the current parameter frame.
protected int pbase = 0, pframe = 0;
protected ArrayList paramsStack = new ArrayList();
/**
* Push a new parameter frame.
*/
public final void pushParamFrame() {
paramsStack.add(pframe, new Integer(pbase));
pbase = ++pframe;
}
/**
* Pop the topmost parameter frame.
*/
public final void popParamFrame() {
if (pbase > 0) {
final int oldpbase = ((Integer)paramsStack.get(--pbase)).intValue();
for (int i = pframe - 1; i >= pbase; i--) {
paramsStack.remove(i);
}
pframe = pbase; pbase = oldpbase;
}
}
/**
* Add a new global parameter if not already in the current frame.
* To setParameters of the form {http://foo.bar}xyz
* This needs to get mapped to an instance variable in the class
* The mapping created so that
* the global variables in the generated class become
* http$colon$$flash$$flash$foo$dot$bar$colon$xyz
*/
public final Object addParameter(String name, Object value) {
name = BasisLibrary.mapQNameToJavaName (name);
return addParameter(name, value, false);
}
/**
* Add a new global or local parameter if not already in the current frame.
* The 'isDefault' parameter is set to true if the value passed is the
* default value from the <xsl:parameter> element's select attribute or
* element body.
*/
public final Object addParameter(String name, Object value,
boolean isDefault)
{
// Local parameters need to be re-evaluated for each iteration
for (int i = pframe - 1; i >= pbase; i--) {
final Parameter param = (Parameter) paramsStack.get(i);
if (param._name.equals(name)) {
// Only overwrite if current value is the default value and
// the new value is _NOT_ the default value.
if (param._isDefault || !isDefault) {
param._value = value;
param._isDefault = isDefault;
return value;
}
return param._value;
}
}
// Add new parameter to parameter stack
paramsStack.add(pframe++, new Parameter(name, value, isDefault));
return value;
}
/**
* Clears the parameter stack.
*/
public void clearParameters() {
pbase = pframe = 0;
paramsStack.clear();
}
/**
* Get the value of a parameter from the current frame or
* <tt>null if undefined.
*/
public final Object getParameter(String name) {
name = BasisLibrary.mapQNameToJavaName (name);
for (int i = pframe - 1; i >= pbase; i--) {
final Parameter param = (Parameter)paramsStack.get(i);
if (param._name.equals(name)) return param._value;
}
return null;
}
/************************************************************************
* Message handling - implementation of <xsl:message>
************************************************************************/
// Holds the translet's message handler - used for <xsl:message>.
// The deault message handler dumps a string stdout, but anything can be
// used, such as a dialog box for applets, etc.
private MessageHandler _msgHandler = null;
/**
* Set the translet's message handler - must implement MessageHandler
*/
public final void setMessageHandler(MessageHandler handler) {
_msgHandler = handler;
}
/**
* Pass a message to the message handler - used by Message class.
*/
public final void displayMessage(String msg) {
if (_msgHandler == null) {
System.err.println(msg);
}
else {
_msgHandler.displayMessage(msg);
}
}
/************************************************************************
* Decimal number format symbol handling
************************************************************************/
// Contains decimal number formatting symbols used by FormatNumberCall
public Hashtable _formatSymbols = null;
/**
* Adds a DecimalFormat object to the _formatSymbols hashtable.
* The entry is created with the input DecimalFormatSymbols.
*/
public void addDecimalFormat(String name, DecimalFormatSymbols symbols) {
// Instanciate hashtable for formatting symbols if needed
if (_formatSymbols == null) _formatSymbols = new Hashtable();
// The name cannot be null - use empty string instead
if (name == null) name = EMPTYSTRING;
// Construct a DecimalFormat object containing the symbols we got
final DecimalFormat df = new DecimalFormat();
if (symbols != null) {
df.setDecimalFormatSymbols(symbols);
}
_formatSymbols.put(name, df);
}
/**
* Retrieves a named DecimalFormat object from _formatSymbols hashtable.
*/
public final DecimalFormat getDecimalFormat(String name) {
if (_formatSymbols != null) {
// The name cannot be null - use empty string instead
if (name == null) name = EMPTYSTRING;
DecimalFormat df = (DecimalFormat)_formatSymbols.get(name);
if (df == null) df = (DecimalFormat)_formatSymbols.get(EMPTYSTRING);
return df;
}
return(null);
}
/**
* Give the translet an opportunity to perform a prepass on the document
* to extract any information that it can store in an optimized form.
*
* Currently, it only extracts information about attributes of type ID.
*/
public final void prepassDocument(DOM document) {
setIndexSize(document.getSize());
buildIDIndex(document);
}
/**
* Leverages the Key Class to implement the XSLT id() function.
* buildIdIndex creates the index (##id) that Key Class uses.
* The index contains the element node index (int) and Id value (String).
*/
private final void buildIDIndex(DOM document) {
setRootForKeys(document.getDocument());
if (document instanceof DOMEnhancedForDTM) {
DOMEnhancedForDTM enhancedDOM = (DOMEnhancedForDTM)document;
// If the input source is DOMSource, the KeyIndex table is not
// built at this time. It will be built later by the lookupId()
// and containsId() methods of the KeyIndex class.
if (enhancedDOM.hasDOMSource()) {
buildKeyIndex(ID_INDEX_NAME, document);
return;
}
else {
final Hashtable elementsByID = enhancedDOM.getElementsWithIDs();
if (elementsByID == null) {
return;
}
// Given a Hashtable of DTM nodes indexed by ID attribute values,
// loop through the table copying information to a KeyIndex
// for the mapping from ID attribute value to DTM node
final Enumeration idValues = elementsByID.keys();
boolean hasIDValues = false;
while (idValues.hasMoreElements()) {
final Object idValue = idValues.nextElement();
final int element =
document.getNodeHandle(
((Integer)elementsByID.get(idValue))
.intValue());
buildKeyIndex(ID_INDEX_NAME, element, idValue);
hasIDValues = true;
}
if (hasIDValues) {
setKeyIndexDom(ID_INDEX_NAME, document);
}
}
}
}
/**
* After constructing the translet object, this method must be called to
* perform any version-specific post-initialization that's required.
*/
public final void postInitialization() {
// If the version of the translet had just one namesArray, split
// it into multiple fields.
if (transletVersion < VER_SPLIT_NAMES_ARRAY) {
int arraySize = namesArray.length;
String[] newURIsArray = new String[arraySize];
String[] newNamesArray = new String[arraySize];
int[] newTypesArray = new int[arraySize];
for (int i = 0; i < arraySize; i++) {
String name = namesArray[i];
int colonIndex = name.lastIndexOf(':');
int lNameStartIdx = colonIndex+1;
if (colonIndex > -1) {
newURIsArray[i] = name.substring(0, colonIndex);
}
// Distinguish attribute and element names. Attribute has
// @ before local part of name.
if (name.charAt(lNameStartIdx) == '@') {
lNameStartIdx++;
newTypesArray[i] = DTM.ATTRIBUTE_NODE;
} else if (name.charAt(lNameStartIdx) == '?') {
lNameStartIdx++;
newTypesArray[i] = DTM.NAMESPACE_NODE;
} else {
newTypesArray[i] = DTM.ELEMENT_NODE;
}
newNamesArray[i] =
(lNameStartIdx == 0) ? name
: name.substring(lNameStartIdx);
}
namesArray = newNamesArray;
urisArray = newURIsArray;
typesArray = newTypesArray;
}
// Was translet compiled using a more recent version of the XSLTC
// compiler than is known by the AbstractTranslet class? If, so
// and we've made it this far (which is doubtful), we should give up.
if (transletVersion > CURRENT_TRANSLET_VERSION) {
BasisLibrary.runTimeError(BasisLibrary.UNKNOWN_TRANSLET_VERSION_ERR,
this.getClass().getName());
}
}
/************************************************************************
* Index(es) for <xsl:key> / key() / id()
************************************************************************/
// Container for all indexes for xsl:key elements
private Hashtable _keyIndexes = null;
private KeyIndex _emptyKeyIndex = null;
private int _indexSize = 0;
private int _currentRootForKeys = 0;
/**
* This method is used to pass the largest DOM size to the translet.
* Needed to make sure that the translet can index the whole DOM.
*/
public void setIndexSize(int size) {
if (size > _indexSize) _indexSize = size;
}
/**
* Creates a KeyIndex object of the desired size - don't want to resize!!!
*/
public KeyIndex createKeyIndex() {
return(new KeyIndex(_indexSize));
}
/**
* Adds a value to a key/id index
* @param name is the name of the index (the key or ##id)
* @param node is the node handle of the node to insert
* @param value is the value that will look up the node in the given index
*/
public void buildKeyIndex(String name, int node, Object value) {
if (_keyIndexes == null) _keyIndexes = new Hashtable();
KeyIndex index = (KeyIndex)_keyIndexes.get(name);
if (index == null) {
_keyIndexes.put(name, index = new KeyIndex(_indexSize));
}
index.add(value, node, _currentRootForKeys);
}
/**
* Create an empty KeyIndex in the DOM case
* @param name is the name of the index (the key or ##id)
* @param dom is the DOM
*/
public void buildKeyIndex(String name, DOM dom) {
if (_keyIndexes == null) _keyIndexes = new Hashtable();
KeyIndex index = (KeyIndex)_keyIndexes.get(name);
if (index == null) {
_keyIndexes.put(name, index = new KeyIndex(_indexSize));
}
index.setDom(dom, dom.getDocument());
}
/**
* Returns the index for a given key (or id).
* The index implements our internal iterator interface
*/
public KeyIndex getKeyIndex(String name) {
// Return an empty key index iterator if none are defined
if (_keyIndexes == null) {
return (_emptyKeyIndex != null)
? _emptyKeyIndex
: (_emptyKeyIndex = new KeyIndex(1));
}
// Look up the requested key index
final KeyIndex index = (KeyIndex)_keyIndexes.get(name);
// Return an empty key index iterator if the requested index not found
if (index == null) {
return (_emptyKeyIndex != null)
? _emptyKeyIndex
: (_emptyKeyIndex = new KeyIndex(1));
}
return(index);
}
private void setRootForKeys(int root) {
_currentRootForKeys = root;
}
/**
* This method builds key indexes - it is overridden in the compiled
* translet in cases where the <xsl:key> element is used
*/
public void buildKeys(DOM document, DTMAxisIterator iterator,
SerializationHandler handler,
int root) throws TransletException {
}
/**
* This method builds key indexes - it is overridden in the compiled
* translet in cases where the <xsl:key> element is used
*/
public void setKeyIndexDom(String name, DOM document) {
getKeyIndex(name).setDom(document, document.getDocument());
}
/************************************************************************
* DOM cache handling
************************************************************************/
// Hold the DOM cache (if any) used with this translet
private DOMCache _domCache = null;
/**
* Sets the DOM cache used for additional documents loaded using the
* document() function.
*/
public void setDOMCache(DOMCache cache) {
_domCache = cache;
}
/**
* Returns the DOM cache used for this translet. Used by the LoadDocument
* class (if present) when the document() function is used.
*/
public DOMCache getDOMCache() {
return(_domCache);
}
/************************************************************************
* Multiple output document extension.
* See compiler/TransletOutput for actual implementation.
************************************************************************/
public SerializationHandler openOutputHandler(String filename, boolean append)
throws TransletException
{
try {
final TransletOutputHandlerFactory factory
= TransletOutputHandlerFactory.newInstance();
String dirStr = new File(filename).getParent();
if ((null != dirStr) && (dirStr.length() > 0)) {
File dir = new File(dirStr);
dir.mkdirs();
}
factory.setEncoding(_encoding);
factory.setOutputMethod(_method);
factory.setOutputStream(new BufferedOutputStream(new FileOutputStream(filename, append)));
factory.setOutputType(TransletOutputHandlerFactory.STREAM);
final SerializationHandler handler
= factory.getSerializationHandler();
transferOutputSettings(handler);
handler.startDocument();
return handler;
}
catch (Exception e) {
throw new TransletException(e);
}
}
public SerializationHandler openOutputHandler(String filename)
throws TransletException
{
return openOutputHandler(filename, false);
}
public void closeOutputHandler(SerializationHandler handler) {
try {
handler.endDocument();
handler.close();
}
catch (Exception e) {
// what can you do?
}
}
/************************************************************************
* Native API transformation methods - _NOT_ JAXP/TrAX
************************************************************************/
/**
* Main transform() method - this is overridden by the compiled translet
*/
public abstract void transform(DOM document, DTMAxisIterator iterator,
SerializationHandler handler)
throws TransletException;
/**
* Calls transform() with a given output handler
*/
public final void transform(DOM document, SerializationHandler handler)
throws TransletException {
try {
transform(document, document.getIterator(), handler);
} finally {
_keyIndexes = null;
}
}
/**
* Used by some compiled code as a shortcut for passing strings to the
* output handler
*/
public final void characters(final String string,
SerializationHandler handler)
throws TransletException {
if (string != null) {
//final int length = string.length();
try {
handler.characters(string);
} catch (Exception e) {
throw new TransletException(e);
}
}
}
/**
* Add's a name of an element whose text contents should be output as CDATA
*/
public void addCdataElement(String name) {
if (_cdata == null) {
_cdata = new Vector();
}
int lastColon = name.lastIndexOf(':');
if (lastColon > 0) {
String uri = name.substring(0, lastColon);
String localName = name.substring(lastColon+1);
_cdata.addElement(uri);
_cdata.addElement(localName);
} else {
_cdata.addElement(null);
_cdata.addElement(name);
}
}
/**
* Transfer the output settings to the output post-processor
*/
protected void transferOutputSettings(SerializationHandler handler) {
if (_method != null) {
if (_method.equals("xml")) {
if (_standalone != null) {
handler.setStandalone(_standalone);
}
if (_omitHeader) {
handler.setOmitXMLDeclaration(true);
}
handler.setCdataSectionElements(_cdata);
if (_version != null) {
handler.setVersion(_version);
}
handler.setIndent(_indent);
handler.setIndentAmount(_indentamount);
if (_doctypeSystem != null) {
handler.setDoctype(_doctypeSystem, _doctypePublic);
}
handler.setIsStandalone(_isStandalone);
}
else if (_method.equals("html")) {
handler.setIndent(_indent);
handler.setDoctype(_doctypeSystem, _doctypePublic);
if (_mediaType != null) {
handler.setMediaType(_mediaType);
}
}
}
else {
handler.setCdataSectionElements(_cdata);
if (_version != null) {
handler.setVersion(_version);
}
if (_standalone != null) {
handler.setStandalone(_standalone);
}
if (_omitHeader) {
handler.setOmitXMLDeclaration(true);
}
handler.setIndent(_indent);
handler.setDoctype(_doctypeSystem, _doctypePublic);
handler.setIsStandalone(_isStandalone);
}
}
private Hashtable _auxClasses = null;
public void addAuxiliaryClass(Class auxClass) {
if (_auxClasses == null) _auxClasses = new Hashtable();
_auxClasses.put(auxClass.getName(), auxClass);
}
public void setAuxiliaryClasses(Hashtable auxClasses) {
_auxClasses = auxClasses;
}
public Class getAuxiliaryClass(String className) {
if (_auxClasses == null) return null;
return((Class)_auxClasses.get(className));
}
// GTM added (see pg 110)
public String[] getNamesArray() {
return namesArray;
}
public String[] getUrisArray() {
return urisArray;
}
public int[] getTypesArray() {
return typesArray;
}
public String[] getNamespaceArray() {
return namespaceArray;
}
public boolean hasIdCall() {
return _hasIdCall;
}
public Templates getTemplates() {
return _templates;
}
public void setTemplates(Templates templates) {
_templates = templates;
}
/**
* Return the state of the services mechanism feature.
*/
public boolean useServicesMechnism() {
return _useServicesMechanism;
}
/**
* Set the state of the services mechanism feature.
*/
public void setServicesMechnism(boolean flag) {
_useServicesMechanism = flag;
}
/**
* Return allowed protocols for accessing external stylesheet.
*/
public String getAllowedProtocols() {
return _accessExternalStylesheet;
}
/**
* Set allowed protocols for accessing external stylesheet.
*/
public void setAllowedProtocols(String protocols) {
_accessExternalStylesheet = protocols;
}
/************************************************************************
* DOMImplementation caching for basis library
************************************************************************/
protected DOMImplementation _domImplementation = null;
public Document newDocument(String uri, String qname)
throws ParserConfigurationException
{
if (_domImplementation == null) {
DocumentBuilderFactory dbf = FactoryImpl.getDOMFactory(_useServicesMechanism);
_domImplementation = dbf.newDocumentBuilder().getDOMImplementation();
}
return _domImplementation.createDocument(uri, qname, null);
}
}
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