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 }
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