/*
    * 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());
    }
  }