com.cloudera.crunch.io.impl.FileTargetImpl.java Source code

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Here is the source code for com.cloudera.crunch.io.impl.FileTargetImpl.java

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/**
 * Copyright (c) 2012, Cloudera, Inc. All Rights Reserved.
 *
 * Cloudera, Inc. 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
 *
 * This software 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.io.impl;

import java.io.IOException;

import org.apache.commons.lang.builder.HashCodeBuilder;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.output.CrunchMultipleOutputs;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

import com.cloudera.crunch.SourceTarget;
import com.cloudera.crunch.io.OutputHandler;
import com.cloudera.crunch.io.PathTarget;
import com.cloudera.crunch.type.Converter;
import com.cloudera.crunch.type.PType;

public class FileTargetImpl implements PathTarget {

    protected final Path path;
    private final Class<? extends FileOutputFormat> outputFormatClass;

    public FileTargetImpl(Path path, Class<? extends FileOutputFormat> outputFormatClass) {
        this.path = path;
        this.outputFormatClass = outputFormatClass;
    }

    @Override
    public void configureForMapReduce(Job job, PType<?> ptype, Path outputPath, String name) {
        Converter converter = ptype.getConverter();
        Class keyClass = converter.getKeyClass();
        Class valueClass = converter.getValueClass();
        configureForMapReduce(job, keyClass, valueClass, outputPath, name);
    }

    protected void configureForMapReduce(Job job, Class keyClass, Class valueClass, Path outputPath, String name) {
        try {
            FileOutputFormat.setOutputPath(job, outputPath);
        } catch (IOException e) {
            throw new RuntimeException("failed to set output path to " + outputPath, e);
        }
        if (name == null) {
            job.setOutputFormatClass(outputFormatClass);
            job.setOutputKeyClass(keyClass);
            job.setOutputValueClass(valueClass);
        } else {
            CrunchMultipleOutputs.addNamedOutput(job, name, outputFormatClass, keyClass, valueClass);
        }
    }

    @Override
    public boolean accept(OutputHandler handler, PType<?> ptype) {
        handler.configure(this, ptype);
        return true;
    }

    @Override
    public Path getPath() {
        return path;
    }

    @Override
    public boolean equals(Object other) {
        if (other == null || !getClass().equals(other.getClass())) {
            return false;
        }
        FileTargetImpl o = (FileTargetImpl) other;
        return path.equals(o.path);
    }

    @Override
    public int hashCode() {
        return new HashCodeBuilder().append(path).toHashCode();
    }

    @Override
    public String toString() {
        return new StringBuilder().append(outputFormatClass.getSimpleName()).append("(").append(path).append(")")
                .toString();
    }

    @Override
    public <T> SourceTarget<T> asSourceTarget(PType<T> ptype) {
        // By default, assume that we cannot do this.
        return null;
    }
}