webhcat/svr/src/main/java/org/apache/hcatalog/templeton/tool/SingleInputFormat.java

/**
 * 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 org.apache.hcatalog.templeton.tool;

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

import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;

/**
 * An empty InputFormat.
 */
public class SingleInputFormat
    extends InputFormat<NullWritable, NullWritable> {
    public List<InputSplit> getSplits(JobContext job)
        throws IOException {
        List<InputSplit> res = new ArrayList<InputSplit>();
        res.add(new NullSplit());
        return res;
    }

    public RecordReader<NullWritable, NullWritable>
    createRecordReader(InputSplit split,
                       TaskAttemptContext context)
        throws IOException {
        return new NullRecordReader();
    }
}