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

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Here is the source code for com.cloudera.crunch.io.avro.AvroFileSourceTarget.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 java.io.IOException;

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

import com.cloudera.crunch.SourceTarget;
import com.cloudera.crunch.io.SourceTargetHelper;
import com.cloudera.crunch.type.PType;
import com.cloudera.crunch.type.avro.AvroInputFormat;
import com.cloudera.crunch.type.avro.AvroType;

public class AvroFileSourceTarget<T> extends AvroFileTarget implements SourceTarget<T> {

    private static final Log LOG = LogFactory.getLog(AvroFileSourceTarget.class);

    private final AvroType<T> ptype;

    public AvroFileSourceTarget(String path, AvroType<T> atype) {
        this(new Path(path), atype);
    }

    public AvroFileSourceTarget(Path path, AvroType<T> ptype) {
        super(path);
        this.ptype = ptype;
    }

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

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

    @Override
    public PType<T> getType() {
        return ptype;
    }

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

    @Override
    public void configureSource(Job job, int inputId) throws IOException {
        SourceTargetHelper.configureSource(job, inputId, AvroInputFormat.class, path);

        Configuration conf = job.getConfiguration();
        String inputSchema = conf.get("avro.input.schema");
        if (inputSchema == null) {
            conf.set("avro.input.schema", ptype.getSchema().toString());
        } else if (!inputSchema.equals(ptype.getSchema().toString())) {
            throw new IllegalStateException("Multiple Avro sources must use the same schema");
        }
    }

    @Override
    public long getSize(Configuration configuration) {
        try {
            return SourceTargetHelper.getPathSize(configuration, path);
        } catch (IOException e) {
            LOG.info(String.format("Exception thrown looking up size of: %s", path), e);
        }
        return 1L;
    }
}