/*
* 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: TemplatesImpl.java,v 1.34 2004/02/23 10:29:36 aruny Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.trax;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Properties;
import java.security.AccessController;
import java.security.PrivilegedAction;
import javax.xml.transform.Templates;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.URIResolver;
import com.sun.org.apache.xalan.internal.xsltc.DOM;
import com.sun.org.apache.xalan.internal.xsltc.Translet;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
import com.sun.org.apache.xalan.internal.xsltc.runtime.Hashtable;
/**
* @author Morten Jorgensen
* @author G. Todd Millerj
* @author Jochen Cordes <Jochen.Cordes@t-online.de>
* @author Santiago Pericas-Geertsen
*/
public final class TemplatesImpl implements Templates, Serializable {
/**
* Name of the superclass of all translets. This is needed to
* determine which, among all classes comprising a translet,
* is the main one.
*/
private static String ABSTRACT_TRANSLET
= "com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet";
/**
* Name of the main class or default name if unknown.
*/
private String _name = null;
/**
* Contains the actual class definition for the translet class and
* any auxiliary classes.
*/
private byte[][] _bytecodes = null;
/**
* Contains the translet class definition(s). These are created when
* this Templates is created or when it is read back from disk.
*/
private Class[] _class = null;
/**
* The index of the main translet class in the arrays _class[] and
* _bytecodes.
*/
private int _transletIndex = -1;
/**
* Contains the list of auxiliary class definitions.
*/
private Hashtable _auxClasses = null;
/**
* Output properties of this translet.
*/
private Properties _outputProperties;
/**
* Number of spaces to add for output indentation.
*/
private int _indentNumber;
/**
* This URIResolver is passed to all Transformers.
* Declaring it transient to fix bug 22438
*/
private transient URIResolver _uriResolver = null;
/**
* Cache the DTM for the stylesheet in a thread local variable,
* which is used by the document('') function.
* Use ThreadLocal because a DTM cannot be shared between
* multiple threads.
* Declaring it transient to fix bug 22438
*/
private transient ThreadLocal _sdom = new ThreadLocal();
/**
* A reference to the transformer factory that this templates
* object belongs to.
*/
private transient TransformerFactoryImpl _tfactory = null;
static final class TransletClassLoader extends ClassLoader {
TransletClassLoader(ClassLoader parent) {
super(parent);
}
/**
* Access to final protected superclass member from outer class.
*/
Class defineClass(final byte[] b) {
return defineClass(null, b, 0, b.length);
}
}
/**
* Create an XSLTC template object from the bytecodes.
* The bytecodes for the translet and auxiliary classes, plus the name of
* the main translet class, must be supplied.
*/
protected TemplatesImpl(byte[][] bytecodes, String transletName,
Properties outputProperties, int indentNumber,
TransformerFactoryImpl tfactory)
{
_bytecodes = bytecodes;
_name = transletName;
_outputProperties = outputProperties;
_indentNumber = indentNumber;
_tfactory = tfactory;
}
/**
* Create an XSLTC template object from the translet class definition(s).
*/
protected TemplatesImpl(Class[] transletClasses, String transletName,
Properties outputProperties, int indentNumber,
TransformerFactoryImpl tfactory)
{
_class = transletClasses;
_name = transletName;
_transletIndex = 0;
_outputProperties = outputProperties;
_indentNumber = indentNumber;
_tfactory = tfactory;
}
/**
* Need for de-serialization, see readObject().
*/
public TemplatesImpl() { }
/**
* Overrides the default readObject implementation since we decided
* it would be cleaner not to serialize the entire tranformer
* factory. [ ref bugzilla 12317 ]
* We need to check if the user defined class for URIResolver also
* implemented Serializable
* if yes then we need to deserialize the URIResolver
* Fix for bugzilla bug 22438
*/
private void readObject(ObjectInputStream is)
throws IOException, ClassNotFoundException
{
is.defaultReadObject();
if (is.readBoolean()) {
_uriResolver = (URIResolver) is.readObject();
}
_tfactory = new TransformerFactoryImpl();
}
/**
* This is to fix bugzilla bug 22438
* If the user defined class implements URIResolver and Serializable
* then we want it to get serialized
*/
private void writeObject(ObjectOutputStream os)
throws IOException, ClassNotFoundException {
os.defaultWriteObject();
if (_uriResolver instanceof Serializable) {
os.writeBoolean(true);
os.writeObject((Serializable) _uriResolver);
}
else {
os.writeBoolean(false);
}
}
/**
* Store URIResolver needed for Transformers.
*/
public synchronized void setURIResolver(URIResolver resolver) {
_uriResolver = resolver;
}
/**
* The TransformerFactory must pass us the translet bytecodes using this
* method before we can create any translet instances
*/
protected synchronized void setTransletBytecodes(byte[][] bytecodes) {
_bytecodes = bytecodes;
}
/**
* Returns the translet bytecodes stored in this template
*/
public synchronized byte[][] getTransletBytecodes() {
return _bytecodes;
}
/**
* Returns the translet bytecodes stored in this template
*/
public synchronized Class[] getTransletClasses() {
try {
if (_class == null) defineTransletClasses();
}
catch (TransformerConfigurationException e) {
// Falls through
}
return _class;
}
/**
* Returns the index of the main class in array of bytecodes
*/
public synchronized int getTransletIndex() {
try {
if (_class == null) defineTransletClasses();
}
catch (TransformerConfigurationException e) {
// Falls through
}
return _transletIndex;
}
/**
* The TransformerFactory should call this method to set the translet name
*/
protected synchronized void setTransletName(String name) {
_name = name;
}
/**
* Returns the name of the main translet class stored in this template
*/
protected synchronized String getTransletName() {
return _name;
}
/**
* Defines the translet class and auxiliary classes.
* Returns a reference to the Class object that defines the main class
*/
private void defineTransletClasses()
throws TransformerConfigurationException {
if (_bytecodes == null) {
ErrorMsg err = new ErrorMsg(ErrorMsg.NO_TRANSLET_CLASS_ERR);
throw new TransformerConfigurationException(err.toString());
}
TransletClassLoader loader = (TransletClassLoader)
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
return new TransletClassLoader(ObjectFactory.findClassLoader());
}
});
try {
final int classCount = _bytecodes.length;
_class = new Class[classCount];
if (classCount > 1) {
_auxClasses = new Hashtable();
}
for (int i = 0; i < classCount; i++) {
_class[i] = loader.defineClass(_bytecodes[i]);
final Class superClass = _class[i].getSuperclass();
// Check if this is the main class
if (superClass.getName().equals(ABSTRACT_TRANSLET)) {
_transletIndex = i;
}
else {
_auxClasses.put(_class[i].getName(), _class[i]);
}
}
if (_transletIndex < 0) {
ErrorMsg err= new ErrorMsg(ErrorMsg.NO_MAIN_TRANSLET_ERR, _name);
throw new TransformerConfigurationException(err.toString());
}
}
catch (ClassFormatError e) {
ErrorMsg err = new ErrorMsg(ErrorMsg.TRANSLET_CLASS_ERR, _name);
throw new TransformerConfigurationException(err.toString());
}
catch (LinkageError e) {
ErrorMsg err = new ErrorMsg(ErrorMsg.TRANSLET_OBJECT_ERR, _name);
throw new TransformerConfigurationException(err.toString());
}
}
/**
* This method generates an instance of the translet class that is
* wrapped inside this Template. The translet instance will later
* be wrapped inside a Transformer object.
*/
private Translet getTransletInstance()
throws TransformerConfigurationException {
try {
if (_name == null) return null;
if (_class == null) defineTransletClasses();
// The translet needs to keep a reference to all its auxiliary
// class to prevent the GC from collecting them
AbstractTranslet translet = (AbstractTranslet) _class[_transletIndex].newInstance();
translet.postInitialization();
translet.setTemplates(this);
if (_auxClasses != null) {
translet.setAuxiliaryClasses(_auxClasses);
}
return translet;
}
catch (InstantiationException e) {
ErrorMsg err = new ErrorMsg(ErrorMsg.TRANSLET_OBJECT_ERR, _name);
throw new TransformerConfigurationException(err.toString());
}
catch (IllegalAccessException e) {
ErrorMsg err = new ErrorMsg(ErrorMsg.TRANSLET_OBJECT_ERR, _name);
throw new TransformerConfigurationException(err.toString());
}
}
/**
* Implements JAXP's Templates.newTransformer()
*
* @throws TransformerConfigurationException
*/
public synchronized Transformer newTransformer()
throws TransformerConfigurationException
{
TransformerImpl transformer;
transformer = new TransformerImpl(getTransletInstance(), _outputProperties,
_indentNumber, _tfactory);
if (_uriResolver != null) {
transformer.setURIResolver(_uriResolver);
}
return transformer;
}
/**
* Implements JAXP's Templates.getOutputProperties(). We need to
* instanciate a translet to get the output settings, so
* we might as well just instanciate a Transformer and use its
* implementation of this method.
*/
public synchronized Properties getOutputProperties() {
try {
return newTransformer().getOutputProperties();
}
catch (TransformerConfigurationException e) {
return null;
}
}
/**
* Return the thread local copy of the stylesheet DOM.
*/
public DOM getStylesheetDOM() {
return (DOM)_sdom.get();
}
/**
* Set the thread local copy of the stylesheet DOM.
*/
public void setStylesheetDOM(DOM sdom) {
_sdom.set(sdom);
}
}
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