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 java.util.List;
059: import javax.servlet.jsp.el.ELException;
060: import javax.servlet.jsp.el.VariableResolver;
061: import javax.servlet.jsp.el.FunctionMapper;
062:
063: /**
064: *
065: * <p>Represents a dynamic value, which consists of a prefix and an
066: * optional set of ValueSuffix elements. A prefix is something like
067: * an identifier, and a suffix is something like a "property of" or
068: * "indexed element of" operator.
069: *
070: * @author Nathan Abramson - Art Technology Group
071: * @author Shawn Bayern
072: * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: luehe $
073: **/
074:
075: public class ComplexValue extends Expression {
076: //-------------------------------------
077: // Properties
078: //-------------------------------------
079: // property prefix
080:
081: Expression mPrefix;
082:
083: public Expression getPrefix() {
084: return mPrefix;
085: }
086:
087: public void setPrefix(Expression pPrefix) {
088: mPrefix = pPrefix;
089: }
090:
091: //-------------------------------------
092: // property suffixes
093:
094: List mSuffixes;
095:
096: public List getSuffixes() {
097: return mSuffixes;
098: }
099:
100: public void setSuffixes(List pSuffixes) {
101: mSuffixes = pSuffixes;
102: }
103:
104: //-------------------------------------
105: /**
106: *
107: * Constructor
108: **/
109: public ComplexValue(Expression pPrefix, List pSuffixes) {
110: mPrefix = pPrefix;
111: mSuffixes = pSuffixes;
112: }
113:
114: //-------------------------------------
115: // Expression methods
116: //-------------------------------------
117: /**
118: *
119: * Returns the expression in the expression language syntax
120: **/
121: public String getExpressionString() {
122: StringBuffer buf = new StringBuffer();
123: buf.append(mPrefix.getExpressionString());
124:
125: for (int i = 0; mSuffixes != null && i < mSuffixes.size(); i++) {
126: ValueSuffix suffix = (ValueSuffix) mSuffixes.get(i);
127: buf.append(suffix.getExpressionString());
128: }
129:
130: return buf.toString();
131: }
132:
133: //-------------------------------------
134: /**
135: *
136: * Evaluates by evaluating the prefix, then applying the suffixes
137: **/
138: public Object evaluate(VariableResolver pResolver,
139: FunctionMapper functions, Logger pLogger)
140: throws ELException {
141: Object ret = mPrefix.evaluate(pResolver, functions, pLogger);
142:
143: // Apply the suffixes
144: for (int i = 0; mSuffixes != null && i < mSuffixes.size(); i++) {
145: ValueSuffix suffix = (ValueSuffix) mSuffixes.get(i);
146: ret = suffix.evaluate(ret, pResolver, functions, pLogger);
147: }
148:
149: return ret;
150: }
151:
152: //-------------------------------------
153: }
|