/*

  * 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;

 /**

  * InputFormat for reading graphs stored as (ordered) adjacency lists

  * with the vertex ids longs and the vertex values and edges doubles.

  * For example:

  * 22 0.1 45 0.3 99 0.44

  * to repesent a vertex with id 22, value of 0.1 and edges to nodes 45 and 99,

  * with values of 0.3 and 0.44, respectively.

  *

  * @param <M> Message data

  */

 public class LongDoubleDoubleAdjacencyListVertexInputFormat<M extends Writable>

     extends TextVertexInputFormat<LongWritable, DoubleWritable,

     DoubleWritable, M> {

   /**

    * VertexReader associated with

    * {@link LongDoubleDoubleAdjacencyListVertexInputFormat}.

    *

    * @param <M> Message data.

    */

   static class VertexReader<M extends Writable> extends

       AdjacencyListVertexReader<LongWritable, DoubleWritable,

       DoubleWritable, M> {

     /**

      * Constructor with Line record reader.

      *

      * @param lineRecordReader Reader to internally use.

      */

     VertexReader(RecordReader<LongWritable, Text> lineRecordReader) {

       super(lineRecordReader);

     }

     /**

      * Constructor with Line record reader and sanitizer.

      *

      * @param lineRecordReader Reader to internally use.

      * @param sanitizer Line sanitizer.

      */

     VertexReader(RecordReader<LongWritable, Text> lineRecordReader,

         LineSanitizer sanitizer) {

       super(lineRecordReader, sanitizer);

     }

     @Override

     public void decodeId(String s, LongWritable id) {

       id.set(Long.valueOf(s));

     }

     @Override

     public void decodeValue(String s, DoubleWritable value) {

       value.set(Double.valueOf(s));

     }

     @Override

     public void decodeEdge(

         String s1,

         String s2,

         Edge<LongWritable, DoubleWritable> textIntWritableEdge) {

       textIntWritableEdge.setDestVertexId(new LongWritable(Long.valueOf(s1)));

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

     }

   }

   @Override

   public org.apache.giraph.graph.VertexReader<LongWritable,

   DoubleWritable, DoubleWritable, M> createVertexReader(

       InputSplit split,

       TaskAttemptContext context) throws IOException {

     return new VertexReader<M>(textInputFormat.createRecordReader(

         split, context));

   }

 }