001: /*
002: * The Apache Software License, Version 1.1
003: *
004: * Copyright (c) 1999 The Apache Software Foundation. All rights
005: * reserved.
006: *
007: * Redistribution and use in source and binary forms, with or without
008: * modification, are permitted provided that the following conditions
009: * are met:
010: *
011: * 1. Redistributions of source code must retain the above copyright
012: * notice, this list of conditions and the following disclaimer.
013: *
014: * 2. Redistributions in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * 3. The end-user documentation included with the redistribution, if
020: * any, must include the following acknowlegement:
021: * "This product includes software developed by the
022: * Apache Software Foundation (http://www.apache.org/)."
023: * Alternately, this acknowlegement may appear in the software itself,
024: * if and wherever such third-party acknowlegements normally appear.
025: *
026: * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
027: * Foundation" must not be used to endorse or promote products derived
028: * from this software without prior written permission. For written
029: * permission, please contact apache@apache.org.
030: *
031: * 5. Products derived from this software may not be called "Apache"
032: * nor may "Apache" appear in their names without prior written
033: * permission of the Apache Group.
034: *
035: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
036: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
039: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046: * SUCH DAMAGE.
047: * ====================================================================
048: *
049: * This software consists of voluntary contributions made by many
050: * individuals on behalf of the Apache Software Foundation. For more
051: * information on the Apache Software Foundation, please see
052: * <http://www.apache.org/>.
053: *
054: */
055:
056: package org.apache.commons.el;
057:
058: import javax.servlet.jsp.el.ELException;
059: import java.math.BigInteger;
060: import java.math.BigDecimal;
061:
062: /**
063: *
064: * <p>The implementation of the unary minus operator
065: *
066: * @author Nathan Abramson - Art Technology Group
067: * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: luehe $
068: **/
069:
070: public class UnaryMinusOperator extends UnaryOperator {
071: //-------------------------------------
072: // Singleton
073: //-------------------------------------
074:
075: public static final UnaryMinusOperator SINGLETON = new UnaryMinusOperator();
076:
077: //-------------------------------------
078: /**
079: *
080: * Constructor
081: **/
082: public UnaryMinusOperator() {
083: }
084:
085: //-------------------------------------
086: // Expression methods
087: //-------------------------------------
088: /**
089: *
090: * Returns the symbol representing the operator
091: **/
092: public String getOperatorSymbol() {
093: return "-";
094: }
095:
096: //-------------------------------------
097: /**
098: *
099: * Applies the operator to the given value
100: **/
101: public Object apply(Object pValue, Logger pLogger)
102: throws ELException {
103: if (pValue == null) {
104: /*
105: if (pLogger.isLoggingWarning ()) {
106: pLogger.logWarning
107: (Constants.ARITH_OP_NULL,
108: getOperatorSymbol ());
109: }
110: */
111: return PrimitiveObjects.getInteger(0);
112: }
113:
114: else if (pValue instanceof BigInteger) {
115: return ((BigInteger) pValue).negate();
116: }
117:
118: else if (pValue instanceof BigDecimal) {
119: return ((BigDecimal) pValue).negate();
120: }
121:
122: else if (pValue instanceof String) {
123: if (Coercions.isFloatingPointString(pValue)) {
124: double dval = ((Number) (Coercions
125: .coerceToPrimitiveNumber(pValue, Double.class,
126: pLogger))).doubleValue();
127: return PrimitiveObjects.getDouble(-dval);
128: } else {
129: long lval = ((Number) (Coercions
130: .coerceToPrimitiveNumber(pValue, Long.class,
131: pLogger))).longValue();
132: return PrimitiveObjects.getLong(-lval);
133: }
134: }
135:
136: else if (pValue instanceof Byte) {
137: return PrimitiveObjects.getByte((byte) -(((Byte) pValue)
138: .byteValue()));
139: } else if (pValue instanceof Short) {
140: return PrimitiveObjects.getShort((short) -(((Short) pValue)
141: .shortValue()));
142: } else if (pValue instanceof Integer) {
143: return PrimitiveObjects
144: .getInteger((int) -(((Integer) pValue).intValue()));
145: } else if (pValue instanceof Long) {
146: return PrimitiveObjects.getLong((long) -(((Long) pValue)
147: .longValue()));
148: } else if (pValue instanceof Float) {
149: return PrimitiveObjects.getFloat((float) -(((Float) pValue)
150: .floatValue()));
151: } else if (pValue instanceof Double) {
152: return PrimitiveObjects
153: .getDouble((double) -(((Double) pValue)
154: .doubleValue()));
155: }
156:
157: else {
158: if (pLogger.isLoggingError()) {
159: pLogger.logError(Constants.UNARY_OP_BAD_TYPE,
160: getOperatorSymbol(), pValue.getClass()
161: .getName());
162: }
163: return PrimitiveObjects.getInteger(0);
164: }
165: }
166:
167: //-------------------------------------
168: }
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