ProtoParquetOutputFormat.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 parquet.proto;

import com.google.protobuf.Message;
import com.google.protobuf.MessageOrBuilder;
import org.apache.hadoop.mapreduce.Job;
import parquet.hadoop.ParquetOutputFormat;
import parquet.hadoop.util.ContextUtil;

/**
 * A Hadoop {@link org.apache.hadoop.mapreduce.OutputFormat} for Protocol Buffer Parquet files.
 * <p/>
 * Usage:
 * <p/>
 * <pre>
 * {@code
 * final Job job = new Job(conf, "Parquet writing job");
 * job.setOutputFormatClass(ProtoParquetOutputFormat.class);
 * ProtoParquetOutputFormat.setOutputPath(job, parquetPath);
 * ProtoParquetOutputFormat.setProtobufClass(job, YourProtocolbuffer.class);
 * }
 * </pre>
 *
 * @author Lukas Nalezenec
 */
public class ProtoParquetOutputFormat<T extends MessageOrBuilder> extends ParquetOutputFormat<T> {

  public static void setProtobufClass(Job job, Class<? extends Message> protoClass) {
    ProtoWriteSupport.setSchema(ContextUtil.getConfiguration(job), protoClass);
  }

  public ProtoParquetOutputFormat(Class<? extends Message> msg) {
    super(new ProtoWriteSupport(msg));
  }

  public ProtoParquetOutputFormat() {
    super(new ProtoWriteSupport());
  }

}