/*
* 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;
import java.io.IOException;
import java.io.InputStream;
import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.sax.BodyContentHandler;
import org.apache.tika.sax.TeeContentHandler;
import org.apache.tika.utils.RegexUtils;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
/**
* Parser decorator that post-processes the results from a decorated parser.
* The post-processing takes care of filling in the "fulltext", "summary",
* and "outlinks" metadata entries based on the full text content returned by
* the decorated parser.
*/
public class ParserPostProcessor extends ParserDecorator {
/**
* Creates a post-processing decorator for the given parser.
*
* @param parser the parser to be decorated
*/
public ParserPostProcessor(Parser parser) {
super(parser);
}
/**
* Forwards the call to the delegated parser and post-processes the
* results as described above.
*/
public void parse(
InputStream stream, ContentHandler handler,
Metadata metadata, ParseContext context)
throws IOException, SAXException, TikaException {
ContentHandler body = new BodyContentHandler();
ContentHandler tee = new TeeContentHandler(handler, body);
super.parse(stream, tee, metadata, context);
String content = body.toString();
metadata.set("fulltext", content);
int length = Math.min(content.length(), 500);
metadata.set("summary", content.substring(0, length));
for (String link : RegexUtils.extractLinks(content)) {
metadata.add("outlinks", link);
}
}
}