/*

  * 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.io.formats;

 import org.apache.giraph.edge.Edge;

 import org.apache.giraph.graph.Vertex;

 import org.apache.hadoop.io.DoubleWritable;

 import org.apache.hadoop.io.FloatWritable;

 import org.apache.hadoop.io.LongWritable;

 import org.apache.hadoop.io.Text;

 import org.apache.hadoop.mapreduce.TaskAttemptContext;

 import org.json.JSONArray;

 import org.json.JSONException;

 import java.io.IOException;

 /**

  * VertexOutputFormat that supports JSON encoded vertices featuring

  * <code>double</code> values and <code>float</code> out-edge weights

  */

 public class JsonLongDoubleFloatDoubleVertexOutputFormat extends

   TextVertexOutputFormat<LongWritable, DoubleWritable,

   FloatWritable> {

   @Override

   public TextVertexWriter createVertexWriter(

       TaskAttemptContext context) {

     return new JsonLongDoubleFloatDoubleVertexWriter();

   }

  /**

   * VertexWriter that supports vertices with <code>double</code>

   * values and <code>float</code> out-edge weights.

   */

   private class JsonLongDoubleFloatDoubleVertexWriter extends

     TextVertexWriterToEachLine {

     @Override

     public Text convertVertexToLine(

       Vertex<LongWritable, DoubleWritable, FloatWritable> vertex

     ) throws IOException {

       JSONArray jsonVertex = new JSONArray();

       try {

         jsonVertex.put(vertex.getId().get());

         jsonVertex.put(vertex.getValue().get());

         JSONArray jsonEdgeArray = new JSONArray();

         for (Edge<LongWritable, FloatWritable> edge : vertex.getEdges()) {

           JSONArray jsonEdge = new JSONArray();

           jsonEdge.put(edge.getTargetVertexId().get());

           jsonEdge.put(edge.getValue().get());

           jsonEdgeArray.put(jsonEdge);

         }

         jsonVertex.put(jsonEdgeArray);

       } catch (JSONException e) {

         throw new IllegalArgumentException(

           "writeVertex: Couldn't write vertex " + vertex);

       }

       return new Text(jsonVertex.toString());

     }

   }

 }