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An HTML-checking library (used by https://html5.validator.nu and the HTML5 facet of the W3C Validator)
There is a newer version: 20.7.2
/*
 * Copyright (c) 2007 Henri Sivonen
 * Copyright (c) 2007 Mozilla Foundation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a 
 * copy of this software and associated documentation files (the "Software"), 
 * to deal in the Software without restriction, including without limitation 
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of the Software, and to permit persons to whom the 
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in 
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
 * DEALINGS IN THE SOFTWARE.
 */

package nu.validator.xml;

import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;

public class CombineContentHandler implements ContentHandler {

    private final ContentHandler first;

    private final ContentHandler second;

    /**
     * @param first
     * @param second
     */
    public CombineContentHandler(ContentHandler first, ContentHandler second) {
        this.first = first;
        this.second = second;
    }

    /**
     * @param arg0
     * @param arg1
     * @param arg2
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#characters(char[], int, int)
     */
    @Override
    public void characters(char[] arg0, int arg1, int arg2) throws SAXException {
        first.characters(arg0, arg1, arg2);
        second.characters(arg0, arg1, arg2);
    }

    /**
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#endDocument()
     */
    @Override
    public void endDocument() throws SAXException {
        first.endDocument();
        second.endDocument();
    }

    /**
     * @param arg0
     * @param arg1
     * @param arg2
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#endElement(java.lang.String,
     *      java.lang.String, java.lang.String)
     */
    @Override
    public void endElement(String arg0, String arg1, String arg2)
            throws SAXException {
        first.endElement(arg0, arg1, arg2);
        second.endElement(arg0, arg1, arg2);
    }

    /**
     * @param arg0
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#endPrefixMapping(java.lang.String)
     */
    @Override
    public void endPrefixMapping(String arg0) throws SAXException {
        first.endPrefixMapping(arg0);
        second.endPrefixMapping(arg0);
    }

    /**
     * @param arg0
     * @param arg1
     * @param arg2
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#ignorableWhitespace(char[], int, int)
     */
    @Override
    public void ignorableWhitespace(char[] arg0, int arg1, int arg2)
            throws SAXException {
        first.ignorableWhitespace(arg0, arg1, arg2);
        second.ignorableWhitespace(arg0, arg1, arg2);
    }

    /**
     * @param arg0
     * @param arg1
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#processingInstruction(java.lang.String,
     *      java.lang.String)
     */
    @Override
    public void processingInstruction(String arg0, String arg1)
            throws SAXException {
        first.processingInstruction(arg0, arg1);
        second.processingInstruction(arg0, arg1);
    }

    /**
     * @param arg0
     * @see org.xml.sax.ContentHandler#setDocumentLocator(org.xml.sax.Locator)
     */
    @Override
    public void setDocumentLocator(Locator arg0) {
        first.setDocumentLocator(arg0);
        second.setDocumentLocator(arg0);
    }

    /**
     * @param arg0
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#skippedEntity(java.lang.String)
     */
    @Override
    public void skippedEntity(String arg0) throws SAXException {
        first.skippedEntity(arg0);
        second.skippedEntity(arg0);
    }

    /**
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#startDocument()
     */
    @Override
    public void startDocument() throws SAXException {
        first.startDocument();
        second.startDocument();
    }

    /**
     * @param arg0
     * @param arg1
     * @param arg2
     * @param arg3
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#startElement(java.lang.String,
     *      java.lang.String, java.lang.String, org.xml.sax.Attributes)
     */
    @Override
    public void startElement(String arg0, String arg1, String arg2,
            Attributes arg3) throws SAXException {
        first.startElement(arg0, arg1, arg2, arg3);
        second.startElement(arg0, arg1, arg2, arg3);
    }

    /**
     * @param arg0
     * @param arg1
     * @throws SAXException
     * @see org.xml.sax.ContentHandler#startPrefixMapping(java.lang.String,
     *      java.lang.String)
     */
    @Override
    public void startPrefixMapping(String arg0, String arg1)
            throws SAXException {
        first.startPrefixMapping(arg0, arg1);
        second.startPrefixMapping(arg0, arg1);
    }

}