/**
* 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.nutch.parse.zip;
// JDK imports
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.net.URL;
// Commons Logging imports
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
// Hadoop imports
import org.apache.hadoop.conf.Configuration;
// Nutch imports
import org.apache.nutch.metadata.Metadata;
import org.apache.nutch.net.protocols.Response;
import org.apache.nutch.parse.Parse;
import org.apache.nutch.parse.ParseData;
import org.apache.nutch.parse.ParseUtil;
import org.apache.nutch.parse.ParseException;
import org.apache.nutch.parse.Outlink;
import org.apache.nutch.protocol.Content;
import org.apache.tika.Tika;
/**
*
* @author Rohit Kulkarni & Ashish Vaidya
*/
public class ZipTextExtractor {
public static final Logger LOG = LoggerFactory.getLogger(ZipTextExtractor.class);
private Configuration conf;
/** Creates a new instance of ZipTextExtractor */
public ZipTextExtractor(Configuration conf) {
this.conf = conf;
}
public String extractText(InputStream input, String url, List<Outlink> outLinksList) throws IOException {
String resultText = "";
ZipInputStream zin = new ZipInputStream(input);
ZipEntry entry;
while ((entry = zin.getNextEntry()) != null) {
if (!entry.isDirectory()) {
int size = (int) entry.getSize();
byte[] b = new byte[size];
for(int x = 0; x < size; x++) {
int err = zin.read();
if(err != -1) {
b[x] = (byte)err;
}
}
String newurl = url + "/";
String fname = entry.getName();
newurl += fname;
URL aURL = new URL(newurl);
String base = aURL.toString();
int i = fname.lastIndexOf('.');
if (i != -1) {
// Trying to resolve the Mime-Type
Tika tika = new Tika();
String contentType = tika.detect(fname);
try {
Metadata metadata = new Metadata();
metadata.set(Response.CONTENT_LENGTH, Long.toString(entry.getSize()));
metadata.set(Response.CONTENT_TYPE, contentType);
Content content = new Content(newurl, base, b, contentType, metadata, this.conf);
Parse parse = new ParseUtil(this.conf).parse(content).get(content.getUrl());
ParseData theParseData = parse.getData();
Outlink[] theOutlinks = theParseData.getOutlinks();
for(int count = 0; count < theOutlinks.length; count++) {
outLinksList.add(new Outlink(theOutlinks[count].getToUrl(), theOutlinks[count].getAnchor()));
}
resultText += entry.getName() + " " + parse.getText() + " ";
} catch (ParseException e) {
if (LOG.isInfoEnabled()) {
LOG.info("fetch okay, but can't parse " + fname + ", reason: " + e.getMessage());
}
}
}
}
}
return resultText;
}
}