/*
 * Copyright (c) 2016 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.templateelement;

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

public class TemplateElementDroppingContentHandlerWrapper
        implements ContentHandler {

    private final ContentHandler delegate;

    private int numberOfTemplatesDeep = 0;

    /**
     * @param delegate
     */
    public TemplateElementDroppingContentHandlerWrapper(ContentHandler delegate,
            ErrorHandler errorHandler) {
        this.delegate = delegate;
    }

    /**
     * @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 {
        delegate.characters(arg0, arg1, arg2);
    }

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

    @Override
    public void endElement(String ns, String localName, String qName)
            throws SAXException {
        if ("http://www.w3.org/1999/xhtml" == ns
                && "template".equals(localName)) {
            numberOfTemplatesDeep--;
            if (numberOfTemplatesDeep != 0) {
                return;
            }
        } else if (numberOfTemplatesDeep > 0) {
            return;
        }
        delegate.endElement(ns, localName, qName);
    }

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

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

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

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

    @Override
    public void startElement(String ns, String localName, String qName,
            Attributes attributes) throws SAXException {
        if ("http://www.w3.org/1999/xhtml" == ns
                && "template".equals(localName)) {
            numberOfTemplatesDeep++;
            if (numberOfTemplatesDeep != 1) {
                return;
            }
        } else if (numberOfTemplatesDeep > 0) {
            return;
        }
        delegate.startElement(ns, localName, qName, attributes);
    }

    /**
     * @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 {
        delegate.startPrefixMapping(arg0, arg1);
    }

}
