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Java example source code file (TrAXFilter.java)

This example Java source code file (TrAXFilter.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

contenthandler, factoryconfigurationerror, inputsource, ioexception, parser, parserconfigurationexception, sax, saxexception, saxparser, string, templates, transformerconfigurationexception, transformerhandlerimpl, transformerimpl, traxfilter, xml, xmlreader

The TrAXFilter.java Java example source code

/*
 * reserved comment block
 * 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: TrAXFilter.java,v 1.2.4.1 2005/09/06 12:23:19 pvedula Exp $
 */


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

import java.io.IOException;

import javax.xml.XMLConstants;
import javax.xml.parsers.FactoryConfigurationError;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.ErrorListener;
import javax.xml.transform.Templates;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.sax.SAXResult;

import com.sun.org.apache.xml.internal.utils.XMLReaderManager;

import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.XMLFilterImpl;
import org.xml.sax.helpers.XMLReaderFactory;

/**
 * skeleton extension of XMLFilterImpl for now.
 * @author Santiago Pericas-Geertsen
 * @author G. Todd Miller
 */
public class TrAXFilter extends XMLFilterImpl {
    private Templates              _templates;
    private TransformerImpl        _transformer;
    private TransformerHandlerImpl _transformerHandler;
    private boolean _useServicesMechanism = true;

    public TrAXFilter(Templates templates)  throws
        TransformerConfigurationException
    {
        _templates = templates;
        _transformer = (TransformerImpl) templates.newTransformer();
        _transformerHandler = new TransformerHandlerImpl(_transformer);
        _useServicesMechanism = _transformer.useServicesMechnism();
    }

    public Transformer getTransformer() {
        return _transformer;
    }

    private void createParent() throws SAXException {
        XMLReader parent = null;
        try {
            SAXParserFactory pfactory = SAXParserFactory.newInstance();
            pfactory.setNamespaceAware(true);

            if (_transformer.isSecureProcessing()) {
                try {
                    pfactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
                }
                catch (SAXException e) {}
            }

            SAXParser saxparser = pfactory.newSAXParser();
            parent = saxparser.getXMLReader();
        }
        catch (ParserConfigurationException e) {
            throw new SAXException(e);
        }
        catch (FactoryConfigurationError e) {
            throw new SAXException(e.toString());
        }

        if (parent == null) {
            parent = XMLReaderFactory.createXMLReader();
        }

        // make this XMLReader the parent of this filter
        setParent(parent);
    }

    public void parse (InputSource input) throws SAXException, IOException
    {
        XMLReader managedReader = null;

        try {
            if (getParent() == null) {
                try {
                    managedReader = XMLReaderManager.getInstance(_useServicesMechanism)
                                                    .getXMLReader();
                    setParent(managedReader);
                } catch (SAXException  e) {
                    throw new SAXException(e.toString());
                }
            }

            // call parse on the parent
            getParent().parse(input);
        } finally {
            if (managedReader != null) {
                XMLReaderManager.getInstance(_useServicesMechanism).releaseXMLReader(managedReader);
            }
        }
    }

    public void parse (String systemId) throws SAXException, IOException
    {
        parse(new InputSource(systemId));
    }

    public void setContentHandler (ContentHandler handler)
    {
        _transformerHandler.setResult(new SAXResult(handler));
        if (getParent() == null) {
                try {
                    createParent();
                }
                catch (SAXException  e) {
                   return;
                }
        }
        getParent().setContentHandler(_transformerHandler);
    }

    public void setErrorListener (ErrorListener handler) { }
}

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