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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  package org.codehaus.activemq.service.impl;
    19
    20  import org.codehaus.activemq.message.ActiveMQMessage;
    21  import org.codehaus.activemq.message.DefaultWireFormat;
    22  import org.codehaus.activemq.message.WireFormat;
    23  import org.codehaus.activemq.util.JMSExceptionHelper;
    24
    25  import javax.jms.JMSException;
    26  import java.io.Externalizable;
    27  import java.io.IOException;
    28  import java.io.ObjectInput;
    29  import java.io.ObjectOutput;
    30
    31
    32  /***
    33   * An entry for a message in a container
    34   *
    35   * @version $Revision: 1.3 $
    36   */
    37  public class MessageEntry implements Externalizable {
    38      private static final long serialVersionUID = -3590625465815936811L;
    39      private static final WireFormat wireFormat = new DefaultWireFormat();
    40
    41
    42      private ActiveMQMessage message;
    43
    44      /***
    45       * Only used by serialisation
    46       */
    47      public MessageEntry() {
    48      }
    49
    50      public MessageEntry(ActiveMQMessage msg) {
    51          this.message = msg;
    52      }
    53
    54
    55      /***
    56       * @return Returns the message.
    57       */
    58      public ActiveMQMessage getMessage() {
    59          return message;
    60      }
    61
    62      /***
    63       * @return a hashCode for this object
    64       */
    65      public int hashCode() {
    66          return message != null ? message.hashCode() : super.hashCode();
    67      }
    68
    69      /***
    70       * Tests equivalence with an other object
    71       *
    72       * @param obj the object to test against
    73       * @return true/false
    74       */
    75
    76      public boolean equals(Object obj) {
    77          boolean result = false;
    78          if (obj != null && obj instanceof MessageEntry) {
    79              MessageEntry other = (MessageEntry) obj;
    80              result = (this.message != null && other.message != null && this.message.equals(other.message) ||
    81                      this.message == null && other.message == null);
    82          }
    83          return result;
    84      }
    85
    86      public void writeExternal(ObjectOutput out) throws IOException {
    87          try {
    88              wireFormat.writePacket(message, out);
    89          }
    90          catch (JMSException e) {
    91              throw JMSExceptionHelper.newIOException(e);
    92          }
    93      }
    94
    95      public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
    96          message = (ActiveMQMessage) wireFormat.readPacket(in);
    97      }
    98  }