com.cloudera.crunch.impl.mr.run.CrunchRecordReader.java Source code

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Here is the source code for com.cloudera.crunch.impl.mr.run.CrunchRecordReader.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.cloudera.crunch.impl.mr.run;

import java.io.IOException;

import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.util.ReflectionUtils;

class CrunchRecordReader<K, V> extends RecordReader<K, V> {

    private final RecordReader<K, V> delegate;

    public CrunchRecordReader(InputSplit inputSplit, TaskAttemptContext context)
            throws IOException, InterruptedException {
        CrunchInputSplit crunchSplit = (CrunchInputSplit) inputSplit;
        InputFormat<K, V> inputFormat = (InputFormat<K, V>) ReflectionUtils
                .newInstance(crunchSplit.getInputFormatClass(), context.getConfiguration());
        this.delegate = inputFormat.createRecordReader(crunchSplit.getInputSplit(), context);
    }

    @Override
    public void close() throws IOException {
        delegate.close();
    }

    @Override
    public K getCurrentKey() throws IOException, InterruptedException {
        return delegate.getCurrentKey();
    }

    @Override
    public V getCurrentValue() throws IOException, InterruptedException {
        return delegate.getCurrentValue();
    }

    @Override
    public float getProgress() throws IOException, InterruptedException {
        return delegate.getProgress();
    }

    @Override
    public void initialize(InputSplit inputSplit, TaskAttemptContext context)
            throws IOException, InterruptedException {
        delegate.initialize(((CrunchInputSplit) inputSplit).getInputSplit(), context);
    }

    @Override
    public boolean nextKeyValue() throws IOException, InterruptedException {
        return delegate.nextKeyValue();
    }

}