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 java.util.List;
059:
060: import org.jbpm.jpdl.el.ELException;
061: import org.jbpm.jpdl.el.FunctionMapper;
062: import org.jbpm.jpdl.el.VariableResolver;
063:
064: /**
065: *
066: * <p>An expression representing one or more unary operators on a
067: * value
068: *
069: * @author Nathan Abramson - Art Technology Group
070: * @author Shawn Bayern
071: * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author$
072: **/
073:
074: public class UnaryOperatorExpression extends Expression {
075: //-------------------------------------
076: // Properties
077: //-------------------------------------
078: // property operator
079:
080: UnaryOperator mOperator;
081:
082: public UnaryOperator getOperator() {
083: return mOperator;
084: }
085:
086: public void setOperator(UnaryOperator pOperator) {
087: mOperator = pOperator;
088: }
089:
090: //-------------------------------------
091: // property operators
092:
093: List mOperators;
094:
095: public List getOperators() {
096: return mOperators;
097: }
098:
099: public void setOperators(List pOperators) {
100: mOperators = pOperators;
101: }
102:
103: //-------------------------------------
104: // property expression
105:
106: Expression mExpression;
107:
108: public Expression getExpression() {
109: return mExpression;
110: }
111:
112: public void setExpression(Expression pExpression) {
113: mExpression = pExpression;
114: }
115:
116: //-------------------------------------
117: /**
118: *
119: * Constructor
120: **/
121: public UnaryOperatorExpression(UnaryOperator pOperator,
122: List pOperators, Expression pExpression) {
123: mOperator = pOperator;
124: mOperators = pOperators;
125: mExpression = pExpression;
126: }
127:
128: //-------------------------------------
129: // Expression methods
130: //-------------------------------------
131: /**
132: *
133: * Returns the expression in the expression language syntax
134: **/
135: public String getExpressionString() {
136: StringBuffer buf = new StringBuffer();
137: buf.append("(");
138: if (mOperator != null) {
139: buf.append(mOperator.getOperatorSymbol());
140: buf.append(" ");
141: } else {
142: for (int i = 0; i < mOperators.size(); i++) {
143: UnaryOperator operator = (UnaryOperator) mOperators
144: .get(i);
145: buf.append(operator.getOperatorSymbol());
146: buf.append(" ");
147: }
148: }
149: buf.append(mExpression.getExpressionString());
150: buf.append(")");
151: return buf.toString();
152: }
153:
154: //-------------------------------------
155: /**
156: *
157: * Evaluates to the literal value
158: **/
159: public Object evaluate(VariableResolver pResolver,
160: FunctionMapper functions, Logger pLogger)
161: throws ELException {
162: Object value = mExpression.evaluate(pResolver, functions,
163: pLogger);
164: if (mOperator != null) {
165: value = mOperator.apply(value, pLogger);
166: } else {
167: for (int i = mOperators.size() - 1; i >= 0; i--) {
168: UnaryOperator operator = (UnaryOperator) mOperators
169: .get(i);
170: value = operator.apply(value, pLogger);
171: }
172: }
173: return value;
174: }
175:
176: //-------------------------------------
177: }
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