VariableResolver


1   /*
2   * Licensed to the Apache Software Foundation (ASF) under one or more
3   * contributor license agreements.  See the NOTICE file distributed with
4   * this work for additional information regarding copyright ownership.
5   * The ASF licenses this file to You under the Apache License, Version 2.0
6   * (the "License"); you may not use this file except in compliance with
7   * the License.  You may obtain a copy of the License at
8   *
9   *     http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17  
18  package javax.servlet.jsp.el;
19  
20  /**
21   * <p>This class is used to customize the way an ExpressionEvaluator resolves
22   * variable references at evaluation time.  For example, instances of this class can
23   * implement their own variable lookup mechanisms, or introduce the
24   * notion of "implicit variables" which override any other variables.
25   * An instance of this class should be passed when evaluating
26   * an expression.</p>
27   *
28   * <p>An instance of this class includes the context against which resolution
29   * will happen</p>
30   *
31   * @since 2.0
32   * @deprecated
33   */
34  public interface VariableResolver
35  {
36    //-------------------------------------
37    /**
38     * Resolves the specified variable.
39     * Returns null if the variable is not found.
40     * 
41     * @param pName the name of the variable to resolve
42     * @return the result of the variable resolution
43     *
44     * @throws ELException if a failure occurred while trying to resolve
45     *     the given variable
46     **/
47    public Object   resolveVariable (String   pName)
48      throws ELException  ;
49                      
50    //-------------------------------------
51  }
52
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