/*
* 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.droids.tika;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamResult;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.droids.LinkTask;
import org.apache.droids.api.ContentEntity;
import org.apache.droids.api.Link;
import org.apache.droids.api.Task;
import org.apache.droids.exception.DroidsException;
import org.apache.droids.tika.api.TikaParse;
import org.apache.droids.tika.api.TikaParser;
import org.apache.droids.tika.parse.TikaParseImpl;
import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.parser.AutoDetectParser;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.parser.html.BoilerpipeContentHandler;
import org.apache.tika.sax.BodyContentHandler;
import org.apache.tika.sax.LinkContentHandler;
import org.apache.tika.sax.TeeContentHandler;
import org.xml.sax.SAXException;
/**
*
* @deprecated Use TikaDocumentParser instead as it handles HTML just fine and performs the same operations.
*
*/
@Deprecated
public class TikaHtmlParser implements TikaParser {
protected static final Log log = LogFactory.getLog(TikaHtmlParser.class);
@Override
public TikaParse parse(ContentEntity entity, Task task) throws IOException, DroidsException {
// Init Tika objects
org.apache.tika.parser.Parser parser = new AutoDetectParser();
Metadata metadata = new Metadata();
String charset = entity.getCharset();
if (charset == null) {
charset = "UTF-8";
}
StringWriter dataBuffer = new StringWriter();
StringWriter bodyBuffer = new StringWriter();
StringWriter mainContentBuffer = new StringWriter();
SAXTransformerFactory factory = (SAXTransformerFactory) SAXTransformerFactory.newInstance();
TransformerHandler xmlHandler;
try {
xmlHandler = factory.newTransformerHandler();
} catch (TransformerConfigurationException e) {
throw new DroidsException(e);
}
xmlHandler.getTransformer().setOutputProperty(OutputKeys.METHOD, "xml");
xmlHandler.setResult(new StreamResult(dataBuffer));
BoilerpipeContentHandler mainContentHandler = new BoilerpipeContentHandler(mainContentBuffer);
BodyContentHandler bodyHandler = new BodyContentHandler(bodyBuffer);
LinkContentHandler linkHandler = new LinkContentHandler();
TeeContentHandler parallelHandler = new TeeContentHandler(xmlHandler, mainContentHandler, bodyHandler, linkHandler );
InputStream instream = entity.obtainContent();
try {
parser.parse(instream, parallelHandler, metadata, new ParseContext());
ArrayList<Link> extractedTasks = new ArrayList<Link>();
if (task instanceof Link) {
int depth = task.getDepth() + 1;
for(org.apache.tika.sax.Link tikaLink : linkHandler.getLinks()) {
try {
URI uri = new URI(tikaLink.getUri());
// Test to see if the scheme is empty
// This would indicate a relative URL, so resolve it against the task URI
if(uri.getScheme() == null) {
uri = ((Link) task).getURI().resolve(uri);
}
extractedTasks.add(new LinkTask((Link)task, uri, depth, tikaLink.getText()));
} catch (URISyntaxException e) {
if(log.isWarnEnabled()) {
log.warn("URI not valid: "+ tikaLink.getUri());
}
}
}
}
return new TikaParseImpl(dataBuffer.toString(), extractedTasks, bodyBuffer.toString(), mainContentBuffer.toString(), metadata);
} catch (SAXException ex) {
throw new DroidsException("Failure parsing document " + task.getId(), ex);
} catch (TikaException ex) {
throw new DroidsException("Failure parsing document " + task.getId(), ex);
} finally {
instream.close();
}
}
}