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Java > Open Source Codes > com > caucho > jms > selector > InSelector


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.selector;
30
31 import javax.jms.JMSException JavaDoc;
32 import javax.jms.Message JavaDoc;
33 import java.util.HashMap JavaDoc;
34
35 /**
36  * The base selector.
37  */
38 public class InSelector extends Selector {
39   private Selector _expr;
40   
41   private HashMap JavaDoc<String JavaDoc,String JavaDoc> _values;
42
43   InSelector(Selector expr)
44   {
45     _expr = expr;
46     _values = new HashMap JavaDoc<String JavaDoc,String JavaDoc>();
47   }
48
49   void addValue(String JavaDoc value)
50   {
51     _values.put(value, value);
52   }
53
54   /**
55    * Evaluate the message. The boolean literal selector returns
56    * the value of the boolean.
57    */
58   Object JavaDoc evaluate(Message JavaDoc message)
59     throws JMSException JavaDoc
60   {
61     Object JavaDoc lobj = _expr.evaluate(message);
62
63     if (! (lobj instanceof String JavaDoc))
64       return NULL;
65
66     return toBoolean(_values.get(lobj) != null);
67   }
68 }
69
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