/*

  * 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.lib;

 import org.apache.giraph.graph.Edge;

 import org.apache.hadoop.io.DoubleWritable;

 import org.apache.hadoop.io.LongWritable;

 import org.apache.hadoop.io.Text;

 import org.apache.hadoop.io.Writable;

 import org.apache.hadoop.mapreduce.InputSplit;

 import org.apache.hadoop.mapreduce.RecordReader;

 import org.apache.hadoop.mapreduce.TaskAttemptContext;

 import java.io.IOException;

 /**

  * Class to read graphs stored as adjacency lists with ids represented by

  * Strings and values as doubles.  This is a good inputformat for reading

  * graphs where the id types do not matter and can be stashed in a String.

  *

  * @param <M> Message type.

  */

 public class TextDoubleDoubleAdjacencyListVertexInputFormat<M extends Writable>

     extends TextVertexInputFormat<Text, DoubleWritable, DoubleWritable, M>  {

   /**

    * Vertex reader used with

    * {@link TextDoubleDoubleAdjacencyListVertexInputFormat}

    *

    * @param <M> Message type.

    */

   static class VertexReader<M extends Writable> extends

       AdjacencyListVertexReader<Text, DoubleWritable, DoubleWritable, M> {

     /**

      * Constructor without sanitzer.

      *

      * @param lineRecordReader Internal reader.

      */

     VertexReader(RecordReader<LongWritable, Text> lineRecordReader) {

       super(lineRecordReader);

     }

     /**

      * Constructor with {@link LineRecordReader}

      *

      * @param lineRecordReader Internal reader.

      * @param sanitizer Sanitizer of the lines.

      */

     VertexReader(RecordReader<LongWritable, Text> lineRecordReader,

         LineSanitizer sanitizer) {

       super(lineRecordReader, sanitizer);

     }

     @Override

     public void decodeId(String s, Text id) {

       id.set(s);

     }

     @Override

     public void decodeValue(String s, DoubleWritable value) {

       value.set(Double.valueOf(s));

     }

     @Override

     public void decodeEdge(String s1, String s2,

                            Edge<Text, DoubleWritable> textIntWritableEdge) {

       textIntWritableEdge.setDestVertexId(new Text(s1));

       textIntWritableEdge.setEdgeValue(new DoubleWritable(Double.valueOf(s2)));

     }

   }

   @Override

   public org.apache.giraph.graph.VertexReader<Text, DoubleWritable,

       DoubleWritable, M> createVertexReader(InputSplit split,

       TaskAttemptContext context) throws IOException {

     return new VertexReader<M>(textInputFormat.createRecordReader(

         split, context));

   }

 }