edu.iu.common.MultiFileRecordReader.java Source code

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Here is the source code for edu.iu.common.MultiFileRecordReader.java

Source

/*
 * Copyright 2014 Indiana University
 * 
 * Licensed 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 edu.iu.common;

import java.io.IOException;
import java.util.List;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;

// need to be modified
public class MultiFileRecordReader extends RecordReader<String, String> {
    private List<Path> pathList;
    private int progress;

    @Override
    public void initialize(InputSplit split, TaskAttemptContext context) throws IOException, InterruptedException {
        pathList = ((MultiFileSplit) split).getPathList();
        progress = -1;
    }

    @Override
    public float getProgress() throws IOException {
        System.out.println("In getProgress : " + progress);
        return (float) progress / (float) pathList.size();
    }

    @Override
    public String getCurrentKey() throws IOException, InterruptedException {
        Path path = pathList.get(progress);
        System.out.println("in current key " + path.toString() + ".");
        return path.toString();
    }

    @Override
    public String getCurrentValue() throws IOException, InterruptedException {
        Path path = pathList.get(progress);
        System.out.println(" get Current Value " + path.toString() + ".");
        return path.toString();
    }

    @Override
    public boolean nextKeyValue() throws IOException, InterruptedException {
        progress++;
        if (progress == pathList.size()) {
            return false;
        }
        return true;
    }

    @Override
    public void close() throws IOException {
        progress = -1;
    }
} // End of FileRecordReader