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Java > Open Source Codes > com > caucho > jms > memory > MemoryQueueBrowser


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.jms.memory;
30
31 import com.caucho.jms.selector.Selector;
32 import com.caucho.jms.selector.SelectorParser;
33 import com.caucho.jms.session.SessionImpl;
34 import com.caucho.log.Log;
35 import com.caucho.util.L10N;
36 import com.caucho.util.NullEnumeration;
37
38 import javax.jms.JMSException JavaDoc;
39 import javax.jms.Queue JavaDoc;
40 import javax.jms.QueueBrowser JavaDoc;
41 import java.util.Enumeration JavaDoc;
42 import java.util.logging.Logger JavaDoc;
43
44 /**
45  * A basic queue.
46  */
47 public class MemoryQueueBrowser implements QueueBrowser JavaDoc {
48   static final Logger JavaDoc log = Log.open(MemoryQueueBrowser.class);
49   static final L10N L = new L10N(MemoryQueueBrowser.class);
50
51   private SessionImpl _session;
52   protected MemoryQueue _queue;
53   private String JavaDoc _messageSelector;
54   private Selector _selector;
55   
56   MemoryQueueBrowser(SessionImpl session,
57              MemoryQueue queue,
58              String JavaDoc messageSelector)
59     throws JMSException JavaDoc
60   {
61     _session = session;
62     _queue = queue;
63     _messageSelector = messageSelector;
64     if (_messageSelector != null) {
65       SelectorParser parser = new SelectorParser();
66       _selector = parser.parse(messageSelector);
67     }
68   }
69
70   /**
71    * Returns the browser's queue.
72    */
73   public Queue JavaDoc getQueue()
74     throws JMSException JavaDoc
75   {
76     return (Queue JavaDoc) _queue;
77   }
78
79   /**
80    * Returns the message selector.
81    */
82   public String JavaDoc getMessageSelector()
83     throws JMSException JavaDoc
84   {
85     return _messageSelector;
86   }
87
88   /**
89    * Returns an enumeration of the matching messages.
90    */
91   public Enumeration getEnumeration()
92     throws JMSException JavaDoc
93   {
94     if (_session.isActive())
95       return _queue.getEnumeration(_selector);
96     else
97       return NullEnumeration.create();
98   }
99
100   public void close()
101     throws JMSException JavaDoc
102   {
103   }
104 }
105
106
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