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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
package org.apache.tika.parser.dif;

import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import org.apache.commons.io.input.CloseShieldInputStream;
import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.mime.MediaType;
import org.apache.tika.parser.AbstractParser;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.sax.EmbeddedContentHandler;
import org.apache.tika.sax.OfflineContentHandler;
import org.apache.tika.sax.TaggedContentHandler;
import org.apache.tika.sax.XHTMLContentHandler;
import org.apache.tika.utils.XMLReaderUtils;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;

import javax.xml.parsers.SAXParser;

public class DIFParser extends AbstractParser {

	/**
	 * 
	 */
	private static final long serialVersionUID = 971505521275777826L;
	private static final Set SUPPORTED_TYPES = Collections
			.unmodifiableSet(new HashSet(Arrays.asList(MediaType.application("dif+xml"))));

	@Override
	public Set getSupportedTypes(ParseContext context) {
		// TODO Auto-generated method stub
		return SUPPORTED_TYPES;
	}

	@Override
	public void parse(InputStream stream, ContentHandler handler,
			Metadata metadata, ParseContext context) throws IOException,
			SAXException, TikaException {
		// TODO Auto-generated method stub
		final XHTMLContentHandler xhtml = new XHTMLContentHandler(handler,
				metadata);
		xhtml.startDocument();
		xhtml.startElement("p");
		TaggedContentHandler tagged = new TaggedContentHandler(handler);
		try {
			XMLReaderUtils.parseSAX(
					new CloseShieldInputStream(stream),
					new OfflineContentHandler(new EmbeddedContentHandler(
							getContentHandler(tagged, metadata, context))), context);
		} catch (SAXException e) {
			tagged.throwIfCauseOf(e);
			throw new TikaException("XML parse error", e);
		} finally {
			xhtml.endElement("p");
			xhtml.endDocument();
		}

	}

	protected ContentHandler getContentHandler(ContentHandler handler,
			Metadata metadata, ParseContext context) {
		
		return new DIFContentHandler(handler, metadata);

	}

}