LiteralSelector


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  ;
32  import javax.jms.Message  ;
33  
34  /**
35   * The base selector.
36   */
37  public class LiteralSelector extends Selector  {
38    private Object   _value;
39  
40    LiteralSelector(Object   value)
41    {
42      _value = value;
43    }
44  
45    /**
46     * Evaluate the message.  The boolean literal selector returns
47     * the value of the boolean.
48     */
49    Object   evaluate(Message   message)
50      throws JMSException  
51    {
52      return _value;
53    }
54  
55    boolean isUnknown()
56    {
57      return false;
58    }
59  
60    boolean isNumber()
61    {
62      return isNumber(_value);
63    }
64  
65    public String   toString()
66    {
67      if (_value instanceof String  )
68        return "'" + _value + "'";
69      else
70        return String.valueOf(_value);
71    }
72  }
73
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