Expression


1   /*
2    * Copyright 1999-2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */ 
16  
17  package org.apache.taglibs.standard.lang.jstl;
18  
19  import java.util.Map  ;
20  
21  /**
22   *
23   * <p>The abstract class from which all expression types
24   * derive.
25   * 
26   * @author Nathan Abramson - Art Technology Group
27   * @author Shawn Bayern
28   * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: pierred $
29   **/
30  
31  public abstract class Expression
32  {
33    //-------------------------------------
34    // Member variables
35    //-------------------------------------
36  
37    //-------------------------------------
38    /**
39     *
40     * Returns the expression in the expression language syntax
41     **/
42    public abstract String   getExpressionString ();
43  
44    //-------------------------------------
45    /**
46     *
47     * Evaluates the expression in the given context
48     **/
49    public abstract Object   evaluate (Object   pContext,
50                     VariableResolver pResolver,
51                     Map   functions,
52                     String   defaultPrefix,
53                     Logger pLogger)
54      throws ELException;
55  
56    //-------------------------------------
57  
58  }
59
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