/*

  * 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.hadoop.io.WritableComparable;

 import java.io.DataInput;

 import java.io.DataOutput;

 import java.io.IOException;

 /**

  * Stores pairs of vertex id and generic data in a single byte array

  *

  * @param <I> Vertex id

  * @param <T> Data

  */

 public abstract class ByteArrayVertexIdData<I extends WritableComparable,

     T> extends AbstractVertexIdData<I, T> {

   /**

    * Get the underlying byte-array.

    *

    * @return The underlying byte-array

    */

   public byte[] getByteArray() {

     return extendedDataOutput.getByteArray();

   }

   @Override

   public void write(DataOutput dataOutput) throws IOException {

     WritableUtils.writeExtendedDataOutput(extendedDataOutput, dataOutput);

   }

   @Override

   public void readFields(DataInput dataInput) throws IOException {

     extendedDataOutput =

         WritableUtils.readExtendedDataOutput(dataInput, getConf());

   }

 }