/*

  * 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.utils;

 import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;

 import org.apache.giraph.edge.Edge;

 import org.apache.hadoop.io.Writable;

 import org.apache.hadoop.io.WritableComparable;

 import java.io.IOException;

 /**

  * Stores vertex id and edge pairs in a single byte array.

  *

  * @param <I> Vertex id

  * @param <E> Edge value

  */

 @SuppressWarnings("unchecked")

 public class ByteArrayVertexIdEdges<I extends WritableComparable,

     E extends Writable> extends ByteArrayVertexIdData<I, Edge<I,

     E>> implements VertexIdEdges<I, E> {

   /**

    * Cast the {@link ImmutableClassesGiraphConfiguration} so it can be used

    * to generate edge objects.

    *

    * @return Casted configuration

    */

   @Override

   public ImmutableClassesGiraphConfiguration<I, ?, E> getConf() {

     return (ImmutableClassesGiraphConfiguration<I, ?, E>) super.getConf();

   }

   @Override

   public Edge<I, E> createData() {

     return getConf().createReusableEdge();

   }

   @Override

   public void writeData(ExtendedDataOutput out, Edge<I, E> edge)

     throws IOException {

     WritableUtils.writeEdge(out, edge);

   }

   @Override

   public void readData(ExtendedDataInput in, Edge<I, E> edge)

     throws IOException {

     WritableUtils.readEdge(in, edge);

   }

   @Override

   public ByteStructVertexIdEdgeIterator<I, E> getVertexIdEdgeIterator() {

     return new ByteStructVertexIdEdgeIterator<>(this);

   }

 }