/*

  * 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.examples;

 import java.io.IOException;

 import org.apache.hadoop.io.FloatWritable;

 import org.apache.hadoop.io.IntWritable;

 import org.apache.hadoop.io.LongWritable;

 import org.apache.hadoop.io.Text;

 import org.apache.hadoop.mapreduce.RecordWriter;

 import org.apache.hadoop.mapreduce.TaskAttemptContext;

 import org.apache.giraph.graph.BasicVertex;

 import org.apache.giraph.graph.VertexWriter;

 import org.apache.giraph.lib.TextVertexOutputFormat;

 /**

  * Simple text based vertex output format example.

  */

 public class SimpleTextVertexOutputFormat extends

     TextVertexOutputFormat<LongWritable, IntWritable, FloatWritable> {

   /**

    * Simple text based vertex writer

    */

   private static class SimpleTextVertexWriter

     extends TextVertexWriter<LongWritable, IntWritable, FloatWritable> {

     /**

      * Initialize with the LineRecordWriter.

      *

      * @param lineRecordWriter Line record writer from TextOutputFormat

      */

     public SimpleTextVertexWriter(

         RecordWriter<Text, Text> lineRecordWriter) {

       super(lineRecordWriter);

     }

     @Override

     public void writeVertex(

       BasicVertex<LongWritable, IntWritable, FloatWritable, ?> vertex)

       throws IOException, InterruptedException {

       getRecordWriter().write(

           new Text(vertex.getVertexId().toString()),

           new Text(vertex.getVertexValue().toString()));

     }

   }

   @Override

   public VertexWriter<LongWritable, IntWritable, FloatWritable>

   createVertexWriter(TaskAttemptContext context)

     throws IOException, InterruptedException {

     RecordWriter<Text, Text> recordWriter =

         textOutputFormat.getRecordWriter(context);

     return new SimpleTextVertexWriter(recordWriter);

   }

 }