| /* |
| * @(#)$Id$ |
| * |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 2001 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Xalan" and "Apache Software Foundation" must |
| * not be used to endorse or promote products derived from this |
| * software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * nor may "Apache" appear in their name, without prior written |
| * permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation and was |
| * originally based on software copyright (c) 2001, Sun |
| * Microsystems., http://www.sun.com. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| * @author Morten Jorgensen |
| * @author G. Todd Millerj |
| * @author Jochen Cordes <Jochen.Cordes@t-online.de> |
| * |
| */ |
| |
| package org.apache.xalan.xsltc.trax; |
| |
| import java.io.Serializable; |
| import java.io.ObjectInput; |
| import java.io.ObjectOutput; |
| import java.io.IOException; |
| import java.util.Properties; |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| |
| import javax.xml.transform.*; |
| |
| import org.apache.xalan.xsltc.Translet; |
| import org.apache.xalan.xsltc.compiler.*; |
| import org.apache.xalan.xsltc.runtime.*; |
| import org.apache.xalan.xsltc.compiler.util.ErrorMsg; |
| |
| public final class TemplatesImpl implements Templates, Serializable { |
| |
| // Contains the name of the main translet class |
| private String _name = null; |
| |
| // Contains the actual class definition for the translet class and |
| // any auxiliary classes (representing node sort records, predicates, etc.) |
| private byte[][] _bytecodes = null; |
| |
| // Contains the translet class definition(s). These are created when this |
| // Templates is first instanciated or read back from disk (see readObject()) |
| private Class[] _class = null; |
| |
| // This tells us which index the main translet class has in the _class |
| // and _bytecodes arrays (above). |
| private int _transletIndex = -1; |
| |
| // Our own private class loader - builds Class definitions from bytecodes |
| private class TransletClassLoader extends ClassLoader { |
| |
| protected TransletClassLoader(ClassLoader parent){ |
| super(parent); |
| } |
| |
| public Class defineClass(byte[] b) { |
| return super.defineClass(null, b, 0, b.length); |
| } |
| } |
| |
| public void writeExternal(ObjectOutput out) throws IOException { |
| out.writeObject(_name); |
| out.writeObject(_bytecodes); |
| out.flush(); |
| } |
| |
| public void readExternal(ObjectInput in) |
| throws IOException, ClassNotFoundException { |
| _name = (String)in.readObject(); |
| _bytecodes = (byte[][])in.readObject(); |
| _class = null; // must be created again... |
| } |
| |
| /** |
| * The only way to create an XSLTC emplate object |
| * 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) { |
| _bytecodes = bytecodes; |
| _name = transletName; |
| } |
| |
| /** |
| * The TransformerFactory must pass us the translet bytecodes using this |
| * method before we can create any translet instances |
| */ |
| protected void setTransletBytecodes(byte[][] bytecodes) { |
| _bytecodes = bytecodes; |
| } |
| |
| /** |
| * Returns the translet bytecodes stored in this template |
| */ |
| protected byte[][] getTransletBytecodes() { |
| return(_bytecodes); |
| } |
| |
| /** |
| * The TransformerFactory should call this method to set the translet name |
| */ |
| protected void setTransletName(String name) { |
| _name = name; |
| } |
| |
| /** |
| * Returns the name of the main translet class stored in this template |
| */ |
| protected 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() { |
| ClassLoader current = getClass().getClassLoader(); |
| return new TransletClassLoader(current); |
| } |
| } |
| ); |
| |
| try { |
| final int classCount = _bytecodes.length; |
| _class = new Class[classCount]; |
| |
| for (int i = 0; i < classCount; i++) { |
| _class[i] = loader.defineClass(_bytecodes[i]); |
| if (_class[i].getName().equals(_name)) |
| _transletIndex = 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 a reference to all its auxiliary class |
| // definitions so that it can instanciate them on the fly. You |
| // wouldn't think this is necessary, but it seems like the JVM |
| // quickly forgets the classes we define here and the translet |
| // needs to know them as long as it exists. |
| Translet translet = (Translet)_class[_transletIndex].newInstance(); |
| final int classCount = _bytecodes.length; |
| for (int i = 0; i < classCount; i++) { |
| if (i != _transletIndex) |
| translet.addAuxiliaryClass(_class[i]); |
| } |
| 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 Transformer newTransformer() |
| throws TransformerConfigurationException { |
| return(new TransformerImpl(getTransletInstance())); |
| } |
| |
| /** |
| * Implements JAXP's Templates.getOutputProperties() |
| */ |
| public Properties 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 |
| try { |
| Transformer transformer = newTransformer(); |
| return transformer.getOutputProperties(); |
| } |
| catch (TransformerConfigurationException e) { |
| return null; |
| } |
| } |
| |
| } |
| |