Source code: org/apache/commons/el/ComplexValue.java
1 /*
2 * The Apache Software License, Version 1.1
3 *
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8 * modification, are permitted provided that the following conditions
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11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
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14 * 2. Redistributions in binary form must reproduce the above copyright
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19 * 3. The end-user documentation included with the redistribution, if
20 * any, must include the following acknowlegement:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowlegement may appear in the software itself,
24 * if and wherever such third-party acknowlegements normally appear.
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27 * Foundation" must not be used to endorse or promote products derived
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55
56 package org.apache.commons.el;
57
58 import java.util.List;
59 import javax.servlet.jsp.el.ELException;
60 import javax.servlet.jsp.el.VariableResolver;
61 import javax.servlet.jsp.el.FunctionMapper;
62
63 /**
64 *
65 * <p>Represents a dynamic value, which consists of a prefix and an
66 * optional set of ValueSuffix elements. A prefix is something like
67 * an identifier, and a suffix is something like a "property of" or
68 * "indexed element of" operator.
69 *
70 * @author Nathan Abramson - Art Technology Group
71 * @author Shawn Bayern
72 * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: luehe $
73 **/
74
75 public class ComplexValue
76 extends Expression
77 {
78 //-------------------------------------
79 // Properties
80 //-------------------------------------
81 // property prefix
82
83 Expression mPrefix;
84 public Expression getPrefix ()
85 { return mPrefix; }
86 public void setPrefix (Expression pPrefix)
87 { mPrefix = pPrefix; }
88
89 //-------------------------------------
90 // property suffixes
91
92 List mSuffixes;
93 public List getSuffixes ()
94 { return mSuffixes; }
95 public void setSuffixes (List pSuffixes)
96 { mSuffixes = pSuffixes; }
97
98 //-------------------------------------
99 /**
100 *
101 * Constructor
102 **/
103 public ComplexValue (Expression pPrefix,
104 List pSuffixes)
105 {
106 mPrefix = pPrefix;
107 mSuffixes = pSuffixes;
108 }
109
110 //-------------------------------------
111 // Expression methods
112 //-------------------------------------
113 /**
114 *
115 * Returns the expression in the expression language syntax
116 **/
117 public String getExpressionString ()
118 {
119 StringBuffer buf = new StringBuffer ();
120 buf.append (mPrefix.getExpressionString ());
121
122 for (int i = 0; mSuffixes != null && i < mSuffixes.size (); i++) {
123 ValueSuffix suffix = (ValueSuffix) mSuffixes.get (i);
124 buf.append (suffix.getExpressionString ());
125 }
126
127 return buf.toString ();
128 }
129
130 //-------------------------------------
131 /**
132 *
133 * Evaluates by evaluating the prefix, then applying the suffixes
134 **/
135 public Object evaluate (VariableResolver pResolver,
136 FunctionMapper functions,
137 Logger pLogger)
138 throws ELException
139 {
140 Object ret = mPrefix.evaluate (pResolver, functions, pLogger);
141
142 // Apply the suffixes
143 for (int i = 0; mSuffixes != null && i < mSuffixes.size (); i++) {
144 ValueSuffix suffix = (ValueSuffix) mSuffixes.get (i);
145 ret = suffix.evaluate (ret, pResolver, functions, pLogger);
146 }
147
148 return ret;
149 }
150
151 //-------------------------------------
152 }