1. /*
  2. * The Apache Software License, Version 1.1
  3. *
  4. * Copyright (c) 1999 The Apache Software Foundation. All rights
  5. * reserved.
  6. *
  7. * Redistribution and use in source and binary forms, with or without
  8. * modification, are permitted provided that the following conditions
  9. * are met:
  10. *
  11. * 1. Redistributions of source code must retain the above copyright
  12. * notice, this list of conditions and the following disclaimer.
  13. *
  14. * 2. Redistributions in binary form must reproduce the above copyright
  15. * notice, this list of conditions and the following disclaimer in
  16. * the documentation and/or other materials provided with the
  17. * distribution.
  18. *
  19. * 3. The end-user documentation included with the redistribution, if
  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.
  25. *
  26. * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
  27. * Foundation" must not be used to endorse or promote products derived
  28. * from this software without prior written permission. For written
  29. * permission, please contact apache@apache.org.
  30. *
  31. * 5. Products derived from this software may not be called "Apache"
  32. * nor may "Apache" appear in their names without prior written
  33. * permission of the Apache Group.
  34. *
  35. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
  36. * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  37. * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  38. * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
  39. * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  41. * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  42. * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  43. * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  44. * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  45. * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  46. * SUCH DAMAGE.
  47. * ====================================================================
  48. *
  49. * This software consists of voluntary contributions made by many
  50. * individuals on behalf of the Apache Software Foundation. For more
  51. * information on the Apache Software Foundation, please see
  52. * <http://www.apache.org/>.
  53. *
  54. */
  55. package org.apache.commons.el;
  56. import javax.servlet.jsp.el.ELException;
  57. import java.math.BigDecimal;
  58. /**
  59. *
  60. * <p>The implementation of the divide operator
  61. *
  62. * @author Nathan Abramson - Art Technology Group
  63. * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: luehe $
  64. **/
  65. public class DivideOperator
  66. extends BinaryOperator
  67. {
  68. //-------------------------------------
  69. // Singleton
  70. //-------------------------------------
  71. public static final DivideOperator SINGLETON =
  72. new DivideOperator ();
  73. //-------------------------------------
  74. /**
  75. *
  76. * Constructor
  77. **/
  78. public DivideOperator ()
  79. {
  80. }
  81. //-------------------------------------
  82. // Expression methods
  83. //-------------------------------------
  84. /**
  85. *
  86. * Returns the symbol representing the operator
  87. **/
  88. public String getOperatorSymbol ()
  89. {
  90. return "/";
  91. }
  92. //-------------------------------------
  93. /**
  94. *
  95. * Applies the operator to the given value
  96. **/
  97. public Object apply (Object pLeft,
  98. Object pRight,
  99. Logger pLogger)
  100. throws ELException
  101. {
  102. if (pLeft == null &&
  103. pRight == null) {
  104. if (pLogger.isLoggingWarning ()) {
  105. pLogger.logWarning
  106. (Constants.ARITH_OP_NULL,
  107. getOperatorSymbol ());
  108. }
  109. return PrimitiveObjects.getInteger (0);
  110. }
  111. if (Coercions.isBigDecimal(pLeft) ||
  112. Coercions.isBigInteger(pLeft) ||
  113. Coercions.isBigDecimal(pRight) ||
  114. Coercions.isBigInteger(pRight)) {
  115. BigDecimal left = (BigDecimal)
  116. Coercions.coerceToPrimitiveNumber(pLeft, BigDecimal.class, pLogger);
  117. BigDecimal right = (BigDecimal)
  118. Coercions.coerceToPrimitiveNumber(pRight, BigDecimal.class, pLogger);
  119. try {
  120. return left.divide(right, BigDecimal.ROUND_HALF_UP);
  121. } catch (Exception exc) {
  122. if (pLogger.isLoggingError()) {
  123. pLogger.logError
  124. (Constants.ARITH_ERROR,
  125. getOperatorSymbol(),
  126. "" + left,
  127. "" + right);
  128. }
  129. return PrimitiveObjects.getInteger(0);
  130. }
  131. } else {
  132. double left =
  133. Coercions.coerceToPrimitiveNumber(pLeft, Double.class, pLogger).
  134. doubleValue();
  135. double right =
  136. Coercions.coerceToPrimitiveNumber(pRight, Double.class, pLogger).
  137. doubleValue();
  138. try {
  139. return PrimitiveObjects.getDouble(left / right);
  140. } catch (Exception exc) {
  141. if (pLogger.isLoggingError()) {
  142. pLogger.logError
  143. (Constants.ARITH_ERROR,
  144. getOperatorSymbol(),
  145. "" + left,
  146. "" + right);
  147. }
  148. return PrimitiveObjects.getInteger(0);
  149. }
  150. }
  151. }
  152. //-------------------------------------
  153. }