com.moz.fiji.mapreduce.MapReduceJobInput.java Source code

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Here is the source code for com.moz.fiji.mapreduce.MapReduceJobInput.java

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/**
 * (c) Copyright 2012 WibiData, Inc.
 *
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * 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 com.moz.fiji.mapreduce;

import java.io.IOException;
import java.util.Map;

import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.Job;

import com.moz.fiji.annotations.ApiAudience;
import com.moz.fiji.annotations.ApiStability;
import com.moz.fiji.annotations.Inheritance;

/** Base class for types of input to a MapReduce job. */
@ApiAudience.Public
@ApiStability.Stable
@Inheritance.Sealed
public abstract class MapReduceJobInput {

    /**
     * Initializes the job input with the given parameters.
     *
     * @param params Parameters, usually parsed from the command-line.
     * @throws IOException on I/O error.
     */
    public abstract void initialize(Map<String, String> params) throws IOException;

    /**
     * Configure a job to use this type of input for the MapReduce.
     *
     * @param job The job to configure with input.
     * @throws IOException If there is an error during configuration.
     */
    public void configure(Job job) throws IOException {
        job.setInputFormatClass(getInputFormatClass());
    }

    /**
     * Returns the class to use for this MapReduce input format type.
     *
     * @return The MR input format class.
     */
    protected abstract Class<? extends InputFormat> getInputFormatClass();
}