smarttransformerfactoryimpl.java

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/*
 * @(#)$Id: SmartTransformerFactoryImpl.java,v 1.1.2.1 2006/09/19 01:07:39 jeffsuttor Exp $
 *
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2001-2003 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 [e-mail].
 *
 * 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 G. Todd Miller 
 *
 */


package com.sun.org.apache.xalan.internal.xsltc.trax;

import javax.xml.transform.ErrorListener;
import javax.xml.transform.Source;
import javax.xml.transform.Templates;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.URIResolver;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.sax.SAXResult;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TemplatesHandler;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import com.sun.org.apache.xml.internal.utils.ObjectFactory;
import org.xml.sax.XMLFilter;

/**
 * Implementation of a transformer factory that uses an XSLTC 
 * transformer factory for the creation of Templates objects
 * and uses the Xalan processor transformer factory for the
 * creation of Transformer objects.  
 */
public class SmartTransformerFactoryImpl extends SAXTransformerFactory 
{

    private SAXTransformerFactory _xsltcFactory = null;
    private SAXTransformerFactory _xalanFactory = null;
    private SAXTransformerFactory _currFactory = null;
    private ErrorListener      _errorlistener = null;
    private URIResolver        _uriresolver = null;

    /**
     * <p>State of secure processing feature.</p>
     */
    private boolean featureSecureProcessing = false;

    /**
     * implementation of the SmartTransformerFactory. This factory
     * uses com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactory
     * to return Templates objects; and uses 
     * com.sun.org.apache.xalan.internal.processor.TransformerFactory
     * to return Transformer objects.  
     */
    public SmartTransformerFactoryImpl() { }

    private void createXSLTCTransformerFactory() {
	_xsltcFactory = new TransformerFactoryImpl();
	_currFactory = _xsltcFactory;
    }

    private void createXalanTransformerFactory() {
 	final String xalanMessage =
	    "com.sun.org.apache.xalan.internal.xsltc.trax.SmartTransformerFactoryImpl "+
	    "could not create an "+
	    "com.sun.org.apache.xalan.internal.processor.TransformerFactoryImpl.";
	// try to create instance of Xalan factory...	
	try {
            Class xalanFactClass = ObjectFactory.findProviderClass(
                "com.sun.org.apache.xalan.internal.processor.TransformerFactoryImpl",
                ObjectFactory.findClassLoader(), true);
	    _xalanFactory = (SAXTransformerFactory)
		xalanFactClass.newInstance();
	} 
	catch (ClassNotFoundException e) {
	    System.err.println(xalanMessage);
        }
 	catch (InstantiationException e) {
	    System.err.println(xalanMessage);
	}
 	catch (IllegalAccessException e) {
	    System.err.println(xalanMessage);
	}
	_currFactory = _xalanFactory;
    }

    public void setErrorListener(ErrorListener listener) 
	throws IllegalArgumentException 
    {
	_errorlistener = listener;
    }

    public ErrorListener getErrorListener() { 
	return _errorlistener;
    }

    public Object getAttribute(String name) 
	throws IllegalArgumentException 
    {
	// GTM: NB: 'debug' should change to something more unique... 
	if ((name.equals("translet-name")) || (name.equals("debug"))) { 
	    if (_xsltcFactory == null) {
                createXSLTCTransformerFactory();
            }
            return _xsltcFactory.getAttribute(name); 
        }
        else {
	    if (_xalanFactory == null) {
	        createXalanTransformerFactory();
	    } 
	    return _xalanFactory.getAttribute(name);
        }
    }

    public void setAttribute(String name, Object value) 
	throws IllegalArgumentException { 
	// GTM: NB: 'debug' should change to something more unique... 
	if ((name.equals("translet-name")) || (name.equals("debug"))) { 
	    if (_xsltcFactory == null) {
                createXSLTCTransformerFactory();
            }
            _xsltcFactory.setAttribute(name, value); 
        }
        else {
	    if (_xalanFactory == null) {
	        createXalanTransformerFactory();
	    } 
	    _xalanFactory.setAttribute(name, value);
        }
    }

    /**
     * <p>Set a feature for this <code>SmartTransformerFactory</code> and <code>Transformer</code>s
     * or <code>Template</code>s created by this factory.</p>
     * 
     * <p>
     * Feature names are fully qualified {@link java.net.URI}s.
     * Implementations may define their own features.
     * An {@link TransformerConfigurationException} is thrown if this <code>TransformerFactory</code> or the
     * <code>Transformer</code>s or <code>Template</code>s it creates cannot support the feature.
     * It is possible for an <code>TransformerFactory</code> to expose a feature value but be unable to change its state.
     * </p>
     * 
     * <p>See {@link javax.xml.transform.TransformerFactory} for full documentation of specific features.</p>
     * 
     * @param name Feature name.
     * @param value Is feature state <code>true</code> or <code>false</code>.
     *  
     * @throws TransformerConfigurationException if this <code>TransformerFactory</code>
     *   or the <code>Transformer</code>s or <code>Template</code>s it creates cannot support this feature.
     * @throws NullPointerException If the <code>name</code> parameter is null.
     */
    public void setFeature(String name, boolean value)
        throws TransformerConfigurationException {

	// feature name cannot be null
	if (name == null) {
            ErrorMsg err = new ErrorMsg(ErrorMsg.JAXP_SET_FEATURE_NULL_NAME);
    	    throw new NullPointerException(err.toString());
	}
	// secure processing?
	else if (name.equals(XMLConstants.FEATURE_SECURE_PROCESSING)) {
	    featureSecureProcessing = value;		
	    // all done processing feature
	    return;
	}
	else {
	    // unknown feature
            ErrorMsg err = new ErrorMsg(ErrorMsg.JAXP_UNSUPPORTED_FEATURE, name);
            throw new TransformerConfigurationException(err.toString());
        }
    }

    /**
     * javax.xml.transform.sax.TransformerFactory implementation.
     * Look up the value of a feature (to see if it is supported).
     * This method must be updated as the various methods and features of this
     * class are implemented.
     *
     * @param name The feature name
     * @return 'true' if feature is supported, 'false' if not
     */
    public boolean getFeature(String name) {