/*

  * 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.gora;

 import java.io.IOException;

 import java.util.Set;

 import org.apache.giraph.edge.Edge;

 import org.apache.giraph.edge.EdgeFactory;

 import org.apache.giraph.graph.Vertex;

 import org.apache.giraph.io.gora.generated.GVertex;

 import org.apache.hadoop.io.DoubleWritable;

 import org.apache.hadoop.io.FloatWritable;

 import org.apache.hadoop.io.LongWritable;

 import org.apache.hadoop.mapreduce.InputSplit;

 import org.apache.hadoop.mapreduce.TaskAttemptContext;

 /**

  * Example implementation of a specific reader for a generated data bean.

  */

 public class GoraGVertexVertexInputFormat

   extends GoraVertexInputFormat<LongWritable, DoubleWritable,

           FloatWritable> {

   /**

    * DEfault constructor

    */

   public GoraGVertexVertexInputFormat() {

   }

   /**

    * Creates specific vertex reader to be used inside Hadoop.

    * @param split split to be read.

    * @param context JobContext to be used.

    * @return GoraVertexReader Vertex reader to be used by Hadoop.

    */

   @Override

   public GoraVertexReader createVertexReader(

       InputSplit split, TaskAttemptContext context) throws IOException {

     return new GoraGVertexVertexReader();

   }

   /**

    * Gora vertex reader

    */

   protected class GoraGVertexVertexReader extends GoraVertexReader {

     /**

      * Transforms a GoraObject into a Vertex object.

      * @param goraObject Object from Gora to be translated.

      * @return Vertex Result from transforming the gora object.

      */

     @Override

     protected Vertex<LongWritable, DoubleWritable, FloatWritable>

     transformVertex(Object goraObject) {

       Vertex<LongWritable, DoubleWritable, FloatWritable> vertex;

       /* create the actual vertex */

       vertex = getConf().createVertex();

       GVertex tmpGVertex = (GVertex) goraObject;

       LongWritable vrtxId = new LongWritable(

         Long.parseLong(tmpGVertex.getVertexId().toString()));

       DoubleWritable vrtxValue = new DoubleWritable(

         tmpGVertex.getVertexValue());

       vertex.initialize(vrtxId, vrtxValue);

       if (tmpGVertex.getEdges() != null && !tmpGVertex.getEdges().isEmpty()) {

         Set<CharSequence> keyIt = tmpGVertex.getEdges().keySet();

         for (CharSequence key : keyIt) {

           String keyVal = key.toString();

           String valVal = tmpGVertex.getEdges().get(key).toString();

           Edge<LongWritable, FloatWritable> edge;

           if (!keyVal.contains("vertexId") && !keyVal.contains("value")) {

             edge = EdgeFactory.create(

                 new LongWritable(Long.parseLong(keyVal)),

                 new FloatWritable(Float.parseFloat(valVal)));

             vertex.addEdge(edge);

           }

         }

       }

       return vertex;

     }

   }

 }