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55
56 package org.apache.commons.el;
57
58 import javax.servlet.jsp.el.ELException JavaDoc;
59 import java.math.BigInteger JavaDoc;
60
61 /**
62  *
63  * <p>The implementation of the modulus operator
64  *
65  * @author Nathan Abramson - Art Technology Group
66  * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: luehe $
67  **/
68
69 public class ModulusOperator
70   extends BinaryOperator
71 {
72   //-------------------------------------
73 // Singleton
74 //-------------------------------------
75
76   public static final ModulusOperator SINGLETON =
77     new ModulusOperator ();
78
79   //-------------------------------------
80 /**
81    *
82    * Constructor
83    **/
84   public ModulusOperator ()
85   {
86   }
87
88   //-------------------------------------
89 // Expression methods
90 //-------------------------------------
91 /**
92    *
93    * Returns the symbol representing the operator
94    **/
95   public String JavaDoc getOperatorSymbol ()
96   {
97     return "%";
98   }
99
100   //-------------------------------------
101 /**
102    *
103    * Applies the operator to the given value
104    **/
105   public Object JavaDoc apply (Object JavaDoc pLeft,
106                Object JavaDoc pRight,
107                Logger pLogger)
108     throws ELException JavaDoc
109   {
110     if (pLeft == null &&
111     pRight == null) {
112       if (pLogger.isLoggingWarning ()) {
113     pLogger.logWarning
114       (Constants.ARITH_OP_NULL,
115        getOperatorSymbol ());
116       }
117       return PrimitiveObjects.getInteger (0);
118     }
119
120     if ((pLeft != null &&
121      (Coercions.isFloatingPointType (pLeft) ||
122       Coercions.isFloatingPointString (pLeft))) ||
123       Coercions.isBigDecimal(pLeft) ||
124     (pRight != null &&
125      (Coercions.isFloatingPointType (pRight) ||
126       Coercions.isFloatingPointString (pRight) ||
127       Coercions.isBigDecimal(pRight)))) {
128       double left =
129     Coercions.coerceToPrimitiveNumber (pLeft, Double JavaDoc.class, pLogger).
130     doubleValue ();
131       double right =
132     Coercions.coerceToPrimitiveNumber (pRight, Double JavaDoc.class, pLogger).
133     doubleValue ();
134
135       try {
136     return PrimitiveObjects.getDouble (left % right);
137       }
138       catch (Exception JavaDoc exc) {
139     if (pLogger.isLoggingError ()) {
140       pLogger.logError
141         (Constants.ARITH_ERROR,
142          getOperatorSymbol (),
143          "" + left,
144          "" + right);
145     }
146     return PrimitiveObjects.getInteger (0);
147       }
148     }
149     else if (Coercions.isBigInteger(pLeft) || Coercions.isBigInteger(pRight)) {
150         BigInteger JavaDoc left = (BigInteger JavaDoc)
151              Coercions.coerceToPrimitiveNumber(pLeft, BigInteger JavaDoc.class, pLogger);
152         BigInteger JavaDoc right = (BigInteger JavaDoc)
153             Coercions.coerceToPrimitiveNumber(pRight, BigInteger JavaDoc.class, pLogger);
154
155         try {
156             return left.remainder(right);
157         } catch (Exception JavaDoc exc) {
158             if (pLogger.isLoggingError()) {
159                 pLogger.logError
160                     (Constants.ARITH_ERROR,
161                         getOperatorSymbol(),
162                         "" + left,
163                         "" + right);
164             }
165             return PrimitiveObjects.getInteger(0);
166         }
167     }
168     else {
169       long left =
170     Coercions.coerceToPrimitiveNumber (pLeft, Long JavaDoc.class, pLogger).
171     longValue ();
172       long right =
173     Coercions.coerceToPrimitiveNumber (pRight, Long JavaDoc.class, pLogger).
174     longValue ();
175
176       try {
177     return PrimitiveObjects.getLong (left % right);
178       }
179       catch (Exception JavaDoc exc) {
180     if (pLogger.isLoggingError ()) {
181       pLogger.logError
182         (Constants.ARITH_ERROR,
183          getOperatorSymbol (),
184          "" + left,
185          "" + right);
186     }
187     return PrimitiveObjects.getInteger (0);
188       }
189     }
190   }
191
192   //-------------------------------------
193 }
194
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