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.jbpm.jpdl.el.impl;
057:
058: import org.jbpm.jpdl.el.ELException;
059:
060: import java.math.BigInteger;
061: import java.math.BigDecimal;
062:
063: /**
064: *
065: * <p>The implementation of the unary minus operator
066: *
067: * @author Nathan Abramson - Art Technology Group
068: * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author$
069: **/
070:
071: public class UnaryMinusOperator extends UnaryOperator {
072: //-------------------------------------
073: // Singleton
074: //-------------------------------------
075:
076: public static final UnaryMinusOperator SINGLETON = new UnaryMinusOperator();
077:
078: //-------------------------------------
079: /**
080: *
081: * Constructor
082: **/
083: public UnaryMinusOperator() {
084: }
085:
086: //-------------------------------------
087: // Expression methods
088: //-------------------------------------
089: /**
090: *
091: * Returns the symbol representing the operator
092: **/
093: public String getOperatorSymbol() {
094: return "-";
095: }
096:
097: //-------------------------------------
098: /**
099: *
100: * Applies the operator to the given value
101: **/
102: public Object apply(Object pValue, Logger pLogger)
103: throws ELException {
104: if (pValue == null) {
105: /*
106: if (pLogger.isLoggingWarning ()) {
107: pLogger.logWarning
108: (Constants.ARITH_OP_NULL,
109: getOperatorSymbol ());
110: }
111: */
112: return PrimitiveObjects.getInteger(0);
113: }
114:
115: else if (pValue instanceof BigInteger) {
116: return ((BigInteger) pValue).negate();
117: }
118:
119: else if (pValue instanceof BigDecimal) {
120: return ((BigDecimal) pValue).negate();
121: }
122:
123: else if (pValue instanceof String) {
124: if (Coercions.isFloatingPointString(pValue)) {
125: double dval = ((Number) (Coercions
126: .coerceToPrimitiveNumber(pValue, Double.class,
127: pLogger))).doubleValue();
128: return PrimitiveObjects.getDouble(-dval);
129: } else {
130: long lval = ((Number) (Coercions
131: .coerceToPrimitiveNumber(pValue, Long.class,
132: pLogger))).longValue();
133: return PrimitiveObjects.getLong(-lval);
134: }
135: }
136:
137: else if (pValue instanceof Byte) {
138: return PrimitiveObjects.getByte((byte) -(((Byte) pValue)
139: .byteValue()));
140: } else if (pValue instanceof Short) {
141: return PrimitiveObjects.getShort((short) -(((Short) pValue)
142: .shortValue()));
143: } else if (pValue instanceof Integer) {
144: return PrimitiveObjects
145: .getInteger((int) -(((Integer) pValue).intValue()));
146: } else if (pValue instanceof Long) {
147: return PrimitiveObjects.getLong((long) -(((Long) pValue)
148: .longValue()));
149: } else if (pValue instanceof Float) {
150: return PrimitiveObjects.getFloat((float) -(((Float) pValue)
151: .floatValue()));
152: } else if (pValue instanceof Double) {
153: return PrimitiveObjects
154: .getDouble((double) -(((Double) pValue)
155: .doubleValue()));
156: }
157:
158: else {
159: if (pLogger.isLoggingError()) {
160: pLogger.logError(Constants.UNARY_OP_BAD_TYPE,
161: getOperatorSymbol(), pValue.getClass()
162: .getName());
163: }
164: return PrimitiveObjects.getInteger(0);
165: }
166: }
167:
168: //-------------------------------------
169: }
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