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>Represents a dynamic value, which consists of a prefix and an
067: * optional set of ValueSuffix elements. A prefix is something like
068: * an identifier, and a suffix is something like a "property of" or
069: * "indexed element of" operator.
070: *
071: * @author Nathan Abramson - Art Technology Group
072: * @author Shawn Bayern
073: * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author$
074: **/
075:
076: public class ComplexValue extends Expression {
077: //-------------------------------------
078: // Properties
079: //-------------------------------------
080: // property prefix
081:
082: Expression mPrefix;
083:
084: public Expression getPrefix() {
085: return mPrefix;
086: }
087:
088: public void setPrefix(Expression pPrefix) {
089: mPrefix = pPrefix;
090: }
091:
092: //-------------------------------------
093: // property suffixes
094:
095: List mSuffixes;
096:
097: public List getSuffixes() {
098: return mSuffixes;
099: }
100:
101: public void setSuffixes(List pSuffixes) {
102: mSuffixes = pSuffixes;
103: }
104:
105: //-------------------------------------
106: /**
107: *
108: * Constructor
109: **/
110: public ComplexValue(Expression pPrefix, List pSuffixes) {
111: mPrefix = pPrefix;
112: mSuffixes = pSuffixes;
113: }
114:
115: //-------------------------------------
116: // Expression methods
117: //-------------------------------------
118: /**
119: *
120: * Returns the expression in the expression language syntax
121: **/
122: public String getExpressionString() {
123: StringBuffer buf = new StringBuffer();
124: buf.append(mPrefix.getExpressionString());
125:
126: for (int i = 0; mSuffixes != null && i < mSuffixes.size(); i++) {
127: ValueSuffix suffix = (ValueSuffix) mSuffixes.get(i);
128: buf.append(suffix.getExpressionString());
129: }
130:
131: return buf.toString();
132: }
133:
134: //-------------------------------------
135: /**
136: *
137: * Evaluates by evaluating the prefix, then applying the suffixes
138: **/
139: public Object evaluate(VariableResolver pResolver,
140: FunctionMapper functions, Logger pLogger)
141: throws ELException {
142: Object ret = mPrefix.evaluate(pResolver, functions, pLogger);
143:
144: // Apply the suffixes
145: for (int i = 0; mSuffixes != null && i < mSuffixes.size(); i++) {
146: ValueSuffix suffix = (ValueSuffix) mSuffixes.get(i);
147: ret = suffix.evaluate(ret, pResolver, functions, pLogger);
148: }
149:
150: return ret;
151: }
152:
153: //-------------------------------------
154: }
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