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    1   /***
    2    *
    3    * Copyright 2004 Protique Ltd
    4    *
    5    * Licensed under the Apache License, Version 2.0 (the "License");
    6    * you may not use this file except in compliance with the License.
    7    * You may obtain a copy of the License at
    8    *
    9    * http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   *
    17   **/
    18
    19
    20  package org.codehaus.activemq.message;
    21
    22  import java.io.DataOutput;
    23  import java.io.IOException;
    24
    25  /***
    26   * Allows instances implementing Packet to written to a DataOutput
    27   */
    28
    29  public interface PacketWriter {
    30
    31      /***
    32       * Return the type of Packet
    33       *
    34       * @return integer representation of the type of Packet
    35       */
    36
    37      public int getPacketType();
    38
    39      /***
    40       * @param packet
    41       * @return true if this PacketWriter can write this type of Packet
    42       */
    43      public boolean canWrite(Packet packet);
    44
    45      /***
    46       * Write a Packet instance to data output stream
    47       *
    48       * @param packet  the instance to be seralized
    49       * @param dataOut the output stream
    50       * @throws IOException thrown if an error occurs
    51       */
    52
    53      public void writePacket(Packet packet, DataOutput dataOut) throws IOException;
    54
    55      /***
    56       * Serializes a Packet int a byte array
    57       *
    58       * @param packet
    59       * @return the byte[]
    60       * @throws IOException
    61       */
    62
    63      public byte[] writePacketToByteArray(Packet packet) throws IOException;
    64
    65
    66  }