1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.myfaces.view.facelets.el;
20
21 import javax.el.VariableMapper;
22
23 /**
24 * Defines an interface to detect when an EL expression has been
25 * resolved by a facelets variable mapper and in that way allow cache it
26 * if it is possible. This class should be implemented by any
27 * "facelets contextual" variable mapper.
28 *
29 * @since 2.0.8
30 * @author Leonardo Uribe
31 *
32 */
33 public abstract class VariableMapperBase extends VariableMapper
34 {
35
36 /**
37 * Check if a variable has been resolved by this variable mapper
38 * or any parent "facelets contextual" variable mapper.
39 *
40 * @return
41 */
42 public abstract boolean isAnyFaceletsVariableResolved();
43
44 /**
45 * Indicates an expression will be resolved, so preparations
46 * should be done to detect if a contextual variable has been resolved.
47 */
48 public abstract void beforeConstructELExpression();
49
50 /**
51 * Cleanup all initialization done.
52 */
53 public abstract void afterConstructELExpression();
54 }