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 javax.faces.validator;
20
21 import javax.el.ELContext;
22 import javax.el.ValueExpression;
23 import javax.el.ValueReference;
24 import javax.faces.el.CompositeComponentExpressionHolder;
25
26 /**
27 * Utility class that isolates UEL calls, to prevent ClassNotFoundException
28 * when bean validation is used without it. It is a similar hack to the one
29 * used in portlet case.
30 *
31 * @since 2.0
32 */
33 final class _BeanValidatorUELUtils
34 {
35
36 /**
37 * Get the ValueReference from the ValueExpression.
38 *
39 * @param valueExpression
40 * @param elCtx
41 * @return A ValueReferenceWrapper with the necessary information about the ValueReference.
42 */
43 public static _ValueReferenceWrapper getUELValueReferenceWrapper(ValueExpression valueExpression,
44 final ELContext elCtx)
45 {
46 ValueReference valueReference = valueExpression.getValueReference(elCtx);
47
48 while (valueReference != null
49 && valueReference.getBase() instanceof CompositeComponentExpressionHolder)
50 {
51 valueExpression = ((CompositeComponentExpressionHolder) valueReference.getBase())
52 .getExpression((String) valueReference.getProperty());
53 if(valueExpression == null)
54 {
55 break;
56 }
57 valueReference = valueExpression.getValueReference(elCtx);
58 }
59
60 if (valueReference != null)
61 {
62 return new _ValueReferenceWrapper(valueReference.getBase(), valueReference.getProperty());
63 }
64
65 return null;
66 }
67
68 }