pp.InputFormatWrapper.java Source code

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Here is the source code for pp.InputFormatWrapper.java

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/*
 * This file is part of Hootenanny.
 *
 * Hootenanny is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * --------------------------------------------------------------------
 *
 * The following copyright notices are generated automatically. If you
 * have a new notice to add, please use the format:
 * " * @copyright Copyright ..."
 * This will properly maintain the copyright information. DigitalGlobe
 * copyrights will be updated automatically.
 *
 * @copyright Copyright (C) 2012, 2014 DigitalGlobe (http://www.digitalglobe.com/)
 */
package pp;

import java.io.IOException;
import java.util.Iterator;
import java.util.Map;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.FloatWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.InputFormat;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordReader;
import org.apache.hadoop.mapred.Reporter;

public class InputFormatWrapper implements InputFormat<FloatWritable, NullWritable> {
    static {
        System.out.println("Initializing...");
        System.out.flush();
        HootHadoop.init();
    }

    static class PipesDummyRecordReader implements RecordReader<FloatWritable, NullWritable> {
        float progress = 0.0f;

        public PipesDummyRecordReader(Configuration job, InputSplit split) throws IOException {
        }

        public FloatWritable createKey() {
            return null;
        }

        public NullWritable createValue() {
            return null;
        }

        public synchronized void close() throws IOException {
        }

        public synchronized long getPos() throws IOException {
            return 0;
        }

        public float getProgress() {
            return progress;
        }

        public synchronized boolean next(FloatWritable key, NullWritable value) throws IOException {
            progress = key.get();
            return true;
        }
    }

    @Override
    public RecordReader<FloatWritable, NullWritable> getRecordReader(InputSplit genericSplit, JobConf job,
            Reporter arg2) throws IOException {
        return new PipesDummyRecordReader(job, genericSplit);
    }

    @Override
    public InputSplit[] getSplits(JobConf job, int numSplits) throws IOException {
        String className = job.get("pretty.pipes.input.format");

        pp.Configuration conf = new pp.Configuration();

        Iterator<Map.Entry<String, String>> it = job.iterator();
        while (it.hasNext()) {
            Map.Entry<String, String> e = it.next();
            conf.set(e.getKey(), e.getValue());
        }
        String pluginStr = job.get("pretty.pipes.plugins");
        System.out.println("plugins: " + pluginStr);
        System.out.flush();
        String[] plugins = new String[0];
        if (pluginStr.isEmpty() == false) {
            plugins = pluginStr.split(",");
        }
        for (int i = 0; i < plugins.length; i++) {
            Plugins.loadLibrary(plugins[i]);
        }

        System.out.println("Creating input format: " + className);
        pp.InputFormat pif = pp.InputFormat.create(className);

        pif.setConfiguration(conf);

        InputSplit[] result = new InputSplit[pif.getSplitCount()];
        for (int i = 0; i < pif.getSplitCount(); i++) {
            pp.InputSplit pis = pif.getSplit(i);
            result[i] = new InputSplitWrapper(pis);
        }

        return result;
    }

}