/*

  * 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.comm.requests;

 import org.apache.giraph.utils.UnsafeByteArrayInputStream;

 import java.io.ByteArrayInputStream;

 import java.io.DataInput;

 import java.io.DataInputStream;

 import java.io.DataOutput;

 import java.io.IOException;

 /**

  * Abstract request which has a byte array as its data

  */

 public abstract class ByteArrayRequest extends WritableRequest {

   /** Request data */

   private byte[] data;

   /**

    * Constructor

    *

    * @param data Request data

    */

   ByteArrayRequest(byte[] data) {

     this.data = data;

   }

   /**

    * Constructor used for reflection only

    */

   ByteArrayRequest() {

   }

   /**

    * Get request data

    *

    * @return Request data

    */

   public byte[] getData() {

     return data;

   }

   /**

    * Get request data in the form of {@link DataInput}

    *

    * @return Request data as {@link DataInput}

    */

   public DataInput getDataInput() {

     return new DataInputStream(new ByteArrayInputStream(data));

   }

   /**

    * Wraps the byte array with UnsafeByteArrayInputStream stream.

    * @return UnsafeByteArrayInputStream

    */

   public UnsafeByteArrayInputStream getUnsafeByteArrayInput() {

     return new UnsafeByteArrayInputStream(data);

   }

   @Override

   void readFieldsRequest(DataInput input) throws IOException {

     int dataLength = input.readInt();

     data = new byte[dataLength];

     input.readFully(data);

   }

   @Override

   void writeRequest(DataOutput output) throws IOException {

     output.writeInt(data.length);

     output.write(data);

   }

   @Override

   public int getSerializedSize() {

     // 4 for the length of data, plus number of data bytes

     return super.getSerializedSize() + 4 + data.length;

   }

 }