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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;
    19
    20  import java.io.Serializable;
    21
    22  /***
    23   * Represents a message identity, either by using a unique
    24   * message number, which is ordered and must not be zero or
    25   * by specifying the String messageID.
    26   * <p/>
    27   * Typically a client accessing the MessageStore may have
    28   * one or the other. Depending on which one is specified the
    29   * other value may be filled in by operations on the MessageStore
    30   *
    31   * @version $Revision: 1.10 $
    32   */
    33  public class MessageIdentity implements Comparable, Serializable {
    34      private static final long serialVersionUID = -5754338187296859149L;
    35
    36      private String messageID;
    37      private Object sequenceNumber;
    38
    39      public MessageIdentity() {
    40      }
    41
    42      public MessageIdentity(String messageID) {
    43          this.messageID = messageID;
    44      }
    45
    46      public MessageIdentity(String messageID, Object sequenceNumber) {
    47          this.messageID = messageID;
    48          this.sequenceNumber = sequenceNumber;
    49      }
    50
    51      public int hashCode() {
    52          return messageID != null ? messageID.hashCode() ^ 0xcafebabe : -1;
    53      }
    54
    55      public boolean equals(Object that) {
    56          return that instanceof MessageIdentity && equals((MessageIdentity) that);
    57      }
    58
    59      public boolean equals(MessageIdentity that) {
    60          return messageID.equals(that.messageID);
    61      }
    62
    63      public int compareTo(Object object) {
    64          if (this == object) {
    65              return 0;
    66          }
    67          else {
    68              if (object instanceof MessageIdentity) {
    69                  MessageIdentity that = (MessageIdentity) object;
    70                  return messageID.compareTo(that.messageID);
    71              }
    72              else {
    73                  return -1;
    74              }
    75          }
    76      }
    77
    78      public String toString() {
    79          return super.toString() + "[id=" + messageID + "; sequenceNo=" + sequenceNumber + "]";
    80      }
    81
    82      public String getMessageID() {
    83          return messageID;
    84      }
    85
    86      public void setMessageID(String messageID) {
    87          this.messageID = messageID;
    88      }
    89
    90      /***
    91       * @return the sequence number which may be a number or some database specific type
    92       */
    93      public Object getSequenceNumber() {
    94          return sequenceNumber;
    95      }
    96
    97      public void setSequenceNumber(Object sequenceNumber) {
    98          this.sequenceNumber = sequenceNumber;
    99      }
    100
    101 }