com.peer2gear.nutch.xquery.ParseResult.java Source code

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Here is the source code for com.peer2gear.nutch.xquery.ParseResult.java

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/*
 * 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 com.peer2gear.nutch.xquery;

import java.io.IOException;

import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.nutch.parse.ParseData;
import org.apache.nutch.util.HadoopFSUtil;

/**
 * @author daniel
 *
 */
public class ParseResult extends Configured implements Tool {

    public static class GetResultMapper extends Mapper<Text, ParseData, Text, Text> {
        public GetResultMapper() {
        }

        @Override
        protected void map(Text key, ParseData value, Context context) throws IOException, InterruptedException {
            String xqResult = value.getMeta(XQueryParseFilter.METADATA_FIELD);
            if (xqResult != null)
                context.write(key, new Text(xqResult));
        }

    }

    /* (non-Javadoc)
     * @see org.apache.hadoop.util.Tool#run(java.lang.String[])
     */
    @Override
    public int run(String[] args) throws Exception {
        if (args.length < 2) {
            System.err.printf("Usage: %s [generic options] (<segment> ... | -dir <segments>) <output>\n",
                    getClass().getSimpleName());
            ToolRunner.printGenericCommandUsage(System.err);
            return -1;
        }

        Job job = new Job(getConf());
        for (int i = 0; i < args.length - 1; i++) {
            if ("-dir".equals(args[i])) {
                Path dir = new Path(args[++i]);
                FileSystem fs = dir.getFileSystem(getConf());
                FileStatus[] fstats = fs.listStatus(dir, HadoopFSUtil.getPassDirectoriesFilter(fs));
                Path[] segments = HadoopFSUtil.getPaths(fstats);
                for (Path segment : segments) {
                    FileInputFormat.addInputPath(job, new Path(segment, ParseData.DIR_NAME));
                }
            } else {
                FileInputFormat.addInputPath(job, new Path(args[i], ParseData.DIR_NAME));
            }
        }
        FileOutputFormat.setOutputPath(job, new Path(args[args.length - 1]));

        job.setInputFormatClass(SequenceFileInputFormat.class);
        job.setMapperClass(GetResultMapper.class);
        job.setNumReduceTasks(0);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(Text.class);

        return job.waitForCompletion(true) ? 0 : 1;
    }

    /**
     * @param args
     * @throws Exception 
     */
    public static void main(String[] args) throws Exception {
        int exitCode = ToolRunner.run(new ParseResult(), args);
        System.exit(exitCode);
    }

}