tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-miscoffice-module/src/main/java/org/apache/tika/parser/dif/DIFParser.java

/*
 * 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.Collections;
import java.util.HashSet;
import java.util.Set;

import org.apache.commons.io.input.CloseShieldInputStream;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;

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;

public class DIFParser extends AbstractParser {

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

    @Override
    public Set<MediaType> 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);

    }

}