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1 /*
2  * The Apache Software License, Version 1.1
3  *
4  * Copyright (c) 1999 The Apache Software Foundation. All rights
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8  * modification, are permitted provided that the following conditions
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12  * notice, this list of conditions and the following disclaimer.
13  *
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15  * notice, this list of conditions and the following disclaimer in
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17  * distribution.
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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.
25  *
26  * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
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55
56 package org.apache.commons.el;
57
58 import java.util.Map JavaDoc;
59 import javax.servlet.jsp.el.ELException JavaDoc;
60 import javax.servlet.jsp.el.VariableResolver JavaDoc;
61 import javax.servlet.jsp.el.FunctionMapper JavaDoc;
62
63 /**
64  *
65  * <p>The abstract class from which all expression types
66  * derive.
67  *
68  * @author Nathan Abramson - Art Technology Group
69  * @author Shawn Bayern
70  * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: luehe $
71  **/
72
73 public abstract class Expression
74 {
75   //-------------------------------------
76 // Member variables
77 //-------------------------------------
78
79   //-------------------------------------
80 /**
81    *
82    * Returns the expression in the expression language syntax
83    **/
84   public abstract String JavaDoc getExpressionString ();
85
86   //-------------------------------------
87 /**
88    *
89    * Evaluates the expression in the given context
90    **/
91   public abstract Object JavaDoc evaluate (VariableResolver JavaDoc pResolver,
92                    FunctionMapper JavaDoc functions,
93                    Logger pLogger)
94     throws ELException JavaDoc;
95
96   //-------------------------------------
97
98 }
99
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