org.mrgeo.format.SubdirRecordReader.java Source code

Introduction

Here is the source code for org.mrgeo.format.SubdirRecordReader.java

Source

/*
 * Copyright 2009-2015 DigitalGlobe, Inc.
 *
 * 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 org.mrgeo.format;

import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;

import java.io.IOException;

public class SubdirRecordReader extends RecordReader<Text, Text> {
    private Text subdir;
    private Text value;
    boolean more = false;

    @Override
    public void close() throws IOException {
    }

    @Override
    public Text getCurrentKey() throws IOException, InterruptedException {
        return subdir;
    }

    @Override
    public Text getCurrentValue() throws IOException, InterruptedException {
        return value;
    }

    @Override
    public float getProgress() throws IOException, InterruptedException {
        // It's either all or none since there is only one record
        return (more) ? 0 : 1;
    }

    @Override
    public void initialize(InputSplit split, TaskAttemptContext context) throws IOException, InterruptedException {
        DirectorySplit ds = (DirectorySplit) split;
        subdir = new Text(ds.getPath().toString());
        value = new Text(ds.getPath().toString());
        more = true;
    }

    @Override
    public boolean nextKeyValue() throws IOException, InterruptedException {
        // Only one K/V pair can be returned - it's the only "record" in the split
        if (!more) {
            subdir = null;
            value = null;
            return false;
        }
        more = false;
        return true;
    }

}