org.apache.nutch.parse.zip.ZipTextExtractor.java Source code

Introduction

Here is the source code for org.apache.nutch.parse.zip.ZipTextExtractor.java

Source

/**
 * 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.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

// 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.ParseImpl;
import org.apache.nutch.parse.ParseException;
import org.apache.nutch.parse.Outlink;
import org.apache.nutch.protocol.Content;
import org.apache.nutch.util.MimeUtil;

/**
 *
 * @author Rohit Kulkarni & Ashish Vaidya
 */
public class ZipTextExtractor {

    /** Get the MimeTypes resolver instance. */
    private MimeUtil MIME;

    public static final Log LOG = LogFactory.getLog(ZipTextExtractor.class);

    private Configuration conf;

    /** Creates a new instance of ZipTextExtractor */
    public ZipTextExtractor(Configuration conf) {
        this.conf = conf;
        this.MIME = new MimeUtil(conf);
    }

    public String extractText(InputStream input, String url, List outLinksList) throws IOException {
        String resultText = "";
        byte temp;

        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
                    String contentType = MIME.getMimeType(fname).getName();
                    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;
    }

}