01: /*
02: * The Apache Software License, Version 1.1
03: *
04: * Copyright (c) 1999 The Apache Software Foundation. All rights
05: * reserved.
06: *
07: * Redistribution and use in source and binary forms, with or without
08: * modification, are permitted provided that the following conditions
09: * are met:
10: *
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: *
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in
16: * the documentation and/or other materials provided with the
17: * distribution.
18: *
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.
25: *
26: * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
27: * Foundation" must not be used to endorse or promote products derived
28: * from this software without prior written permission. For written
29: * permission, please contact apache@apache.org.
30: *
31: * 5. Products derived from this software may not be called "Apache"
32: * nor may "Apache" appear in their names without prior written
33: * permission of the Apache Group.
34: *
35: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46: * SUCH DAMAGE.
47: * ====================================================================
48: *
49: * This software consists of voluntary contributions made by many
50: * individuals on behalf of the Apache Software Foundation. For more
51: * information on the Apache Software Foundation, please see
52: * <http://www.apache.org/>.
53: *
54: */
55:
56: package org.apache.commons.el;
57:
58: import java.util.Map;
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>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: // Member variables
76: //-------------------------------------
77:
78: //-------------------------------------
79: /**
80: *
81: * Returns the expression in the expression language syntax
82: **/
83: public abstract String getExpressionString();
84:
85: //-------------------------------------
86: /**
87: *
88: * Evaluates the expression in the given context
89: **/
90: public abstract Object evaluate(VariableResolver pResolver,
91: FunctionMapper functions, Logger pLogger)
92: throws ELException;
93:
94: //-------------------------------------
95:
96: }
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