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Java > Open Source Codes > org > apache > taglibs > standard > lang > jstl > GreaterThanOrEqualsOperator


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */

16
17 package org.apache.taglibs.standard.lang.jstl;
18
19 /**
20  *
21  * <p>The implementation of the greater than or equals operator
22  *
23  * @author Nathan Abramson - Art Technology Group
24  * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: pierred $
25  **/

26
27 public class GreaterThanOrEqualsOperator
28   extends RelationalOperator
29 {
30   //-------------------------------------
31
// Singleton
32
//-------------------------------------
33

34   public static final GreaterThanOrEqualsOperator SINGLETON =
35     new GreaterThanOrEqualsOperator ();
36
37   //-------------------------------------
38
/**
39    *
40    * Constructor
41    **/

42   public GreaterThanOrEqualsOperator ()
43   {
44   }
45
46   //-------------------------------------
47
// Expression methods
48
//-------------------------------------
49
/**
50    *
51    * Returns the symbol representing the operator
52    **/

53   public String JavaDoc getOperatorSymbol ()
54   {
55     return ">=";
56   }
57
58   //-------------------------------------
59
/**
60    *
61    * Applies the operator to the given value
62    **/

63   public Object JavaDoc apply (Object JavaDoc pLeft,
64                Object JavaDoc pRight,
65                Object JavaDoc pContext,
66                Logger pLogger)
67     throws ELException
68   {
69     if (pLeft == pRight) {
70       return Boolean.TRUE;
71     }
72     else if (pLeft == null ||
73          pRight == null) {
74       return Boolean.FALSE;
75     }
76     else {
77       return super.apply (pLeft, pRight, pContext, pLogger);
78     }
79   }
80
81   //-------------------------------------
82
/**
83    *
84    * Applies the operator to the given double values
85    **/

86   public boolean apply (double pLeft,
87             double pRight,
88             Logger pLogger)
89   {
90     return pLeft >= pRight;
91   }
92   
93   //-------------------------------------
94
/**
95    *
96    * Applies the operator to the given long values
97    **/

98   public boolean apply (long pLeft,
99             long pRight,
100             Logger pLogger)
101   {
102     return pLeft >= pRight;
103   }
104   
105   //-------------------------------------
106
/**
107    *
108    * Applies the operator to the given String values
109    **/

110   public boolean apply (String JavaDoc pLeft,
111             String JavaDoc pRight,
112             Logger pLogger)
113   {
114     return pLeft.compareTo (pRight) >= 0;
115   }
116
117   //-------------------------------------
118
}
119
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