/*

  * 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 org.apache.giraph.graph.Vertex;

 import org.apache.giraph.io.formats.TextVertexOutputFormat;

 import org.apache.hadoop.io.DoubleWritable;

 import org.apache.hadoop.io.LongWritable;

 import org.apache.hadoop.io.NullWritable;

 import org.apache.hadoop.io.Text;

 import org.apache.hadoop.mapreduce.TaskAttemptContext;

 import java.io.IOException;

 /**

  * Output format for vertices with a long as id, a double as value and

  * null edges

  */

 public class VertexWithDoubleValueNullEdgeTextOutputFormat extends

     TextVertexOutputFormat<LongWritable, DoubleWritable, NullWritable> {

   @Override

   public TextVertexWriter createVertexWriter(TaskAttemptContext context)

     throws IOException, InterruptedException {

     return new VertexWithDoubleValueWriter();

   }

   /**

    * Vertex writer used with

    * {@link VertexWithDoubleValueNullEdgeTextOutputFormat}.

    */

   public class VertexWithDoubleValueWriter extends TextVertexWriter {

     @Override

     public void writeVertex(

         Vertex<LongWritable, DoubleWritable, NullWritable> vertex)

       throws IOException, InterruptedException {

       StringBuilder output = new StringBuilder();

       output.append(vertex.getId().get());

       output.append('\t');

       output.append(vertex.getValue().get());

       getRecordWriter().write(new Text(output.toString()), null);

     }

   }

 }