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.BigInteger;
  58. import java.math.BigDecimal;
  59. /**
  60. *
  61. * <p>The implementation of the unary minus operator
  62. *
  63. * @author Nathan Abramson - Art Technology Group
  64. * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: luehe $
  65. **/
  66. public class UnaryMinusOperator
  67. extends UnaryOperator
  68. {
  69. //-------------------------------------
  70. // Singleton
  71. //-------------------------------------
  72. public static final UnaryMinusOperator SINGLETON =
  73. new UnaryMinusOperator ();
  74. //-------------------------------------
  75. /**
  76. *
  77. * Constructor
  78. **/
  79. public UnaryMinusOperator ()
  80. {
  81. }
  82. //-------------------------------------
  83. // Expression methods
  84. //-------------------------------------
  85. /**
  86. *
  87. * Returns the symbol representing the operator
  88. **/
  89. public String getOperatorSymbol ()
  90. {
  91. return "-";
  92. }
  93. //-------------------------------------
  94. /**
  95. *
  96. * Applies the operator to the given value
  97. **/
  98. public Object apply (Object pValue,
  99. Logger pLogger)
  100. throws ELException
  101. {
  102. if (pValue == null) {
  103. /*
  104. if (pLogger.isLoggingWarning ()) {
  105. pLogger.logWarning
  106. (Constants.ARITH_OP_NULL,
  107. getOperatorSymbol ());
  108. }
  109. */
  110. return PrimitiveObjects.getInteger (0);
  111. }
  112. else if (pValue instanceof BigInteger) {
  113. return ((BigInteger) pValue).negate();
  114. }
  115. else if (pValue instanceof BigDecimal) {
  116. return ((BigDecimal) pValue).negate();
  117. }
  118. else if (pValue instanceof String) {
  119. if (Coercions.isFloatingPointString (pValue)) {
  120. double dval =
  121. ((Number)
  122. (Coercions.coerceToPrimitiveNumber
  123. (pValue, Double.class, pLogger))).
  124. doubleValue ();
  125. return PrimitiveObjects.getDouble (-dval);
  126. }
  127. else {
  128. long lval =
  129. ((Number)
  130. (Coercions.coerceToPrimitiveNumber
  131. (pValue, Long.class, pLogger))).
  132. longValue ();
  133. return PrimitiveObjects.getLong (-lval);
  134. }
  135. }
  136. else if (pValue instanceof Byte) {
  137. return PrimitiveObjects.getByte
  138. ((byte) -(((Byte) pValue).byteValue ()));
  139. }
  140. else if (pValue instanceof Short) {
  141. return PrimitiveObjects.getShort
  142. ((short) -(((Short) pValue).shortValue ()));
  143. }
  144. else if (pValue instanceof Integer) {
  145. return PrimitiveObjects.getInteger
  146. ((int) -(((Integer) pValue).intValue ()));
  147. }
  148. else if (pValue instanceof Long) {
  149. return PrimitiveObjects.getLong
  150. ((long) -(((Long) pValue).longValue ()));
  151. }
  152. else if (pValue instanceof Float) {
  153. return PrimitiveObjects.getFloat
  154. ((float) -(((Float) pValue).floatValue ()));
  155. }
  156. else if (pValue instanceof Double) {
  157. return PrimitiveObjects.getDouble
  158. ((double) -(((Double) pValue).doubleValue ()));
  159. }
  160. else {
  161. if (pLogger.isLoggingError ()) {
  162. pLogger.logError
  163. (Constants.UNARY_OP_BAD_TYPE,
  164. getOperatorSymbol (),
  165. pValue.getClass ().getName ());
  166. }
  167. return PrimitiveObjects.getInteger (0);
  168. }
  169. }
  170. //-------------------------------------
  171. }