com.cloudera.crunch.io.avro.AvroFileTarget.java Source code

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Here is the source code for com.cloudera.crunch.io.avro.AvroFileTarget.java

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/**
 * Copyright (c) 2011, 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.avro;

import org.apache.commons.lang.builder.HashCodeBuilder;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.Job;

import com.cloudera.crunch.io.MapReduceTarget;
import com.cloudera.crunch.io.OutputHandler;
import com.cloudera.crunch.io.PathTarget;
import com.cloudera.crunch.io.SourceTargetHelper;
import com.cloudera.crunch.type.PType;
import com.cloudera.crunch.type.avro.AvroOutputFormat;
import com.cloudera.crunch.type.avro.AvroType;

public class AvroFileTarget implements PathTarget, MapReduceTarget {

    protected final Path path;

    public AvroFileTarget(String path) {
        this(new Path(path));
    }

    public AvroFileTarget(Path path) {
        this.path = path;
    }

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

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

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

    @Override
    public String toString() {
        return "AvroTarget(" + path.toString() + ")";
    }

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

    @Override
    public void configureForMapReduce(Job job, PType<?> ptype, Path outputPath, String name) {
        AvroType<?> atype = (AvroType<?>) ptype;
        Configuration conf = job.getConfiguration();
        String outputSchema = conf.get("avro.output.schema");
        if (outputSchema == null) {
            conf.set("avro.output.schema", atype.getSchema().toString());
        } else if (!outputSchema.equals(atype.getSchema().toString())) {
            throw new IllegalStateException("Avro targets must use the same output schema");
        }

        SourceTargetHelper.configureTarget(job, AvroOutputFormat.class, ptype.getDataBridge(), outputPath, name);
    }
}