edu.iu.common.FileRecordReader.java Source code

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

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/*
 * 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 org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.lib.input.FileSplit;

// need to be modified
public class FileRecordReader extends RecordReader<String, String> {
    private Path path;
    private boolean done = false;

    @Override
    public void initialize(InputSplit split, TaskAttemptContext context) throws IOException, InterruptedException {
        path = ((FileSplit) split).getPath();
    }

    @Override
    public float getProgress() throws IOException {
        System.out.println("in getProgress : " + done);
        if (done) {
            return 1.0f;
        } else {
            return 0.0f;
        }
    }

    @Override
    public String getCurrentKey() throws IOException, InterruptedException {
        System.out.println("in current key " + path.toString() + " :" + done);
        String pathName = path.getName();
        int index = pathName.lastIndexOf("/");
        return pathName.substring(index + 1, pathName.length());
    }

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

    @Override
    public boolean nextKeyValue() throws IOException, InterruptedException {
        System.out.println("next keyvalue : " + path.toString() + " :" + done);
        if (done) {
            return false;
        } else {
            done = true;
            return true;
        }
    }

    @Override
    public void close() throws IOException {
        done = true;
    }
} // end of FileRecordReader