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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  package org.codehaus.activemq.message;
    20
    21  import java.io.DataInput;
    22  import java.io.IOException;
    23
    24  /***
    25   * Allows instances implementing Packet to read from a DataOutputStream
    26   */
    27
    28  public interface PacketReader {
    29
    30      /***
    31       * Return the type of Packet
    32       *
    33       * @return integer representation of the type of Packet
    34       */
    35
    36      public int getPacketType();
    37
    38      /***
    39       * @param packetType
    40       * @return true if this PacketReader can a Packet of this type
    41       */
    42      public boolean canRead(int packetType);
    43
    44      /***
    45       * @return a new Packet instance
    46       */
    47
    48      public Packet createPacket();
    49
    50      /***
    51       * build a Packet instance from the data input stream
    52       *
    53       * @param packet A Packet object
    54       * @param dataIn the data input stream to build the packet from
    55       * @throws IOException
    56       */
    57
    58      public void buildPacket(Packet packet, DataInput dataIn) throws IOException;
    59
    60      /***
    61       * Deserailizes a Packet from a byte array
    62       *
    63       * @param data
    64       * @return the deserialized Packet
    65       * @throws IOException
    66       */
    67
    68      public Packet readPacketFromByteArray(byte[] data) throws IOException;
    69
    70  }