/*

  * 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 org.apache.giraph.bsp;

 import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;

 import org.apache.hadoop.io.Text;

 import org.apache.hadoop.mapreduce.JobContext;

 import org.apache.hadoop.mapreduce.OutputCommitter;

 import org.apache.hadoop.mapreduce.OutputFormat;

 import org.apache.hadoop.mapreduce.RecordWriter;

 import org.apache.hadoop.mapreduce.TaskAttemptContext;

 import org.apache.log4j.Logger;

 import java.io.IOException;

 /**

  * This is for internal use only.  Allows the vertex output format routines

  * to be called as if a normal Hadoop job.

  */

 public class BspOutputFormat extends OutputFormat<Text, Text> {

   /** Class logger */

   private static Logger LOG = Logger.getLogger(BspOutputFormat.class);

   @Override

   public void checkOutputSpecs(JobContext context)

     throws IOException, InterruptedException {

     ImmutableClassesGiraphConfiguration conf =

         new ImmutableClassesGiraphConfiguration(context.getConfiguration());

     if (!conf.hasVertexOutputFormat() && !conf.hasEdgeOutputFormat()) {

       LOG.warn("checkOutputSpecs: ImmutableOutputCommiter" +

           " will not check anything");

       return;

     }

     if (conf.hasVertexOutputFormat()) {

       conf.createWrappedVertexOutputFormat().checkOutputSpecs(context);

     }

     if (conf.hasEdgeOutputFormat()) {

       conf.createWrappedEdgeOutputFormat().checkOutputSpecs(context);

     }

   }

   @Override

   public OutputCommitter getOutputCommitter(TaskAttemptContext context)

     throws IOException, InterruptedException {

     ImmutableClassesGiraphConfiguration conf =

         new ImmutableClassesGiraphConfiguration(context.getConfiguration());

     if (!conf.hasVertexOutputFormat() && !conf.hasEdgeOutputFormat()) {

       LOG.warn("getOutputCommitter: Returning " +

           "ImmutableOutputCommiter (does nothing).");

       return new ImmutableOutputCommitter();

     }

     if (conf.hasVertexOutputFormat()) {

       return conf.createWrappedVertexOutputFormat().getOutputCommitter(context);

     } else {

       return conf.createWrappedEdgeOutputFormat().getOutputCommitter(context);

     }

   }

   @Override

   public RecordWriter<Text, Text> getRecordWriter(TaskAttemptContext context)

     throws IOException, InterruptedException {

     return new BspRecordWriter();

   }

 }