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Java > Open Source Codes > com > caucho > jmx > query > LtExpr


1 /*
2  * Copyright (c) 1998-2003 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.jmx.query;
30
31 import javax.management.*;
32
33 /**
34  * Implementation of a less-than query
35  */
36 public class LtExpr extends AbstractExp implements QueryExp {
37   private ValueExp _v1;
38   private ValueExp _v2;
39
40   /**
41    * Creates a new less-than query.
42    */
43   public LtExpr(ValueExp v1, ValueExp v2)
44   {
45     _v1 = v1;
46     _v2 = v2;
47   }
48
49   /**
50    * Evaluates the expression to a boolean.
51    *
52    * @param name the object to test.
53    *
54    * @return true if the query is a match.
55    */
56   public boolean apply(ObjectName name)
57     throws BadStringOperationException, BadBinaryOpValueExpException,
58        BadAttributeValueExpException, InvalidApplicationException
59   {
60     return toDouble(_v1.apply(name)) < toDouble(_v2.apply(name));
61   }
62   
63   /**
64    * Returns the expression for the query.
65    */
66   public String toString()
67   {
68     return "lt(" + _v1 + "," + _v2 + ")";
69   }
70 }
71
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