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Java > Open Source Codes > org > apache > commons > el > LessThanOperator


1 /*
2  * The Apache Software License, Version 1.1
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20  * any, must include the following acknowlegement:
21  * "This product includes software developed by the
22  * Apache Software Foundation (http://www.apache.org/)."
23  * Alternately, this acknowlegement may appear in the software itself,
24  * if and wherever such third-party acknowlegements normally appear.
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55
56 package org.apache.commons.el;
57
58 import javax.servlet.jsp.el.ELException JavaDoc;
59 import java.math.BigDecimal JavaDoc;
60 import java.math.BigInteger JavaDoc;
61
62 /**
63  *
64  * <p>The implementation of the less than operator
65  *
66  * @author Nathan Abramson - Art Technology Group
67  * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: luehe $
68  **/
69
70 public class LessThanOperator
71   extends RelationalOperator
72 {
73   //-------------------------------------
74 // Singleton
75 //-------------------------------------
76
77   public static final LessThanOperator SINGLETON =
78     new LessThanOperator ();
79
80   //-------------------------------------
81 /**
82    *
83    * Constructor
84    **/
85   public LessThanOperator ()
86   {
87   }
88
89   //-------------------------------------
90 // Expression methods
91 //-------------------------------------
92 /**
93    *
94    * Returns the symbol representing the operator
95    **/
96   public String JavaDoc getOperatorSymbol ()
97   {
98     return "<";
99   }
100
101   //-------------------------------------
102 /**
103    *
104    * Applies the operator to the given value
105    **/
106   public Object JavaDoc apply (Object JavaDoc pLeft,
107                Object JavaDoc pRight,
108                Logger pLogger)
109     throws ELException JavaDoc
110   {
111     if (pLeft == pRight) {
112       return Boolean.FALSE;
113     }
114     else if (pLeft == null ||
115          pRight == null) {
116       return Boolean.FALSE;
117     }
118     else {
119       return super.apply (pLeft, pRight, pLogger);
120     }
121   }
122
123   //-------------------------------------
124 /**
125    *
126    * Applies the operator to the given double values
127    **/
128   public boolean apply (double pLeft, double pRight) {
129     return pLeft < pRight;
130   }
131   
132   //-------------------------------------
133 /**
134    *
135    * Applies the operator to the given long values
136    **/
137   public boolean apply (long pLeft, long pRight) {
138     return pLeft < pRight;
139   }
140   
141   //-------------------------------------
142 /**
143    *
144    * Applies the operator to the given String values
145    **/
146   public boolean apply (String JavaDoc pLeft, String JavaDoc pRight) {
147     return pLeft.compareTo (pRight) < 0;
148   }
149
150   //-------------------------------------
151
152     /**
153      *
154      * Applies the operator to the given BigDecimal values, returning a BigDecimal
155      **/
156     public boolean apply(BigDecimal JavaDoc pLeft, BigDecimal JavaDoc pRight) {
157         return isLess(pLeft.compareTo(pRight));
158     }
159
160     //-------------------------------------
161
162     /**
163      *
164      * Applies the operator to the given BigDecimal values, returning a BigDecimal
165      **/
166     public boolean apply(BigInteger JavaDoc pLeft, BigInteger JavaDoc pRight) {
167         return isLess(pLeft.compareTo(pRight));
168     }
169
170     //-------------------------------------
171 }
172
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