/*

  * 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.mapping.translate;

 import org.apache.giraph.conf.DefaultImmutableClassesGiraphConfigurable;

 import org.apache.giraph.worker.BspServiceWorker;

 import org.apache.giraph.worker.LocalData;

 import org.apache.hadoop.io.ByteWritable;

 import org.apache.hadoop.io.DoubleWritable;

 import org.apache.hadoop.io.FloatWritable;

 import org.apache.hadoop.io.IntWritable;

 import org.apache.hadoop.io.LongWritable;

 import org.apache.hadoop.io.NullWritable;

 import org.apache.hadoop.io.Writable;

 /**

  * Basic implementation of Translate Edge

  * where I = LongWritable & B = ByteWritable

  *

  * @param <E> edge value type

  */

 @SuppressWarnings("unchecked")

 public class LongByteTranslateEdge<E extends Writable>

   extends DefaultImmutableClassesGiraphConfigurable

   implements TranslateEdge<LongWritable, E> {

   /** Local data used for targetId translation of edge */

   private LocalData<LongWritable,

     ? extends Writable, E, ByteWritable> localData;

   @Override

   public void initialize(BspServiceWorker<LongWritable,

     ? extends Writable, E> service) {

     localData = (LocalData<LongWritable, ? extends Writable, E, ByteWritable>)

       service.getLocalData();

   }

   @Override

   public LongWritable translateId(LongWritable targetId) {

     LongWritable translatedId = new LongWritable();

     translatedId.set(targetId.get());

     localData.getMappingStoreOps().embedTargetInfo(translatedId);

     return translatedId;

   }

   @Override

   public E cloneValue(E edgeValue) {

     // If vertex input does not have create edges,

     // then you can use LongByteTranslateEdge directly

     throw new UnsupportedOperationException();

   }

   /**

    * Correct implementation of cloneValue when edgevalue = nullwritable

    */

   public static class NoEdgeValue

     extends LongByteTranslateEdge<NullWritable> {

     @Override

     public NullWritable cloneValue(NullWritable edgeValue) {

       return NullWritable.get();

     }

   }

   /**

    * Correct implementation of cloneValue when edgevalue = intwritable

    */

   public static class IntEdgeValue

       extends LongByteTranslateEdge<IntWritable> {

     @Override

     public IntWritable cloneValue(IntWritable edgeValue) {

       return new IntWritable(edgeValue.get());

     }

   }

   /**

    * Correct implementation of cloneValue when edgevalue = longwritable

    */

   public static class LongEdgeValue

     extends LongByteTranslateEdge<LongWritable> {

     @Override

     public LongWritable cloneValue(LongWritable edgeValue) {

       return new LongWritable(edgeValue.get());

     }

   }

   /**

    * Correct implementation of cloneValue when edgevalue = floatwritable

    */

   public static class FloatEdgeValue

     extends LongByteTranslateEdge<FloatWritable> {

     @Override

     public FloatWritable cloneValue(FloatWritable edgeValue) {

       return new FloatWritable(edgeValue.get());

     }

   }

   /**

    * Correct implementation of cloneValue when edgevalue = doublewritable

    */

   public static class DoubleEdgeValue

     extends LongByteTranslateEdge<DoubleWritable> {

     @Override

     public DoubleWritable cloneValue(DoubleWritable edgeValue) {

       return new DoubleWritable(edgeValue.get());

     }

   }

 }