1 /*
2 * $Id: FacesCompositeELResolver.java,v 1.8.4.1 2007/12/17 21:14:35 rlubke Exp $
3 */
4 /*
5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
6 *
7 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
8 *
9 * The contents of this file are subject to the terms of either the GNU
10 * General Public License Version 2 only ("GPL") or the Common Development
11 * and Distribution License("CDDL") (collectively, the "License"). You
12 * may not use this file except in compliance with the License. You can obtain
13 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
14 * or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
15 * language governing permissions and limitations under the License.
16 *
17 * When distributing the software, include this License Header Notice in each
18 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
19 * Sun designates this particular file as subject to the "Classpath" exception
20 * as provided by Sun in the GPL Version 2 section of the License file that
21 * accompanied this code. If applicable, add the following below the License
22 * Header, with the fields enclosed by brackets [] replaced by your own
23 * identifying information: "Portions Copyrighted [year]
24 * [name of copyright owner]"
25 *
26 * Contributor(s):
27 *
28 * If you wish your version of this file to be governed by only the CDDL or
29 * only the GPL Version 2, indicate your decision by adding "[Contributor]
30 * elects to include this software in this distribution under the [CDDL or GPL
31 * Version 2] license." If you don't indicate a single choice of license, a
32 * recipient has the option to distribute your version of this file under
33 * either the CDDL, the GPL Version 2 or to extend the choice of license to
34 * its licensees as provided above. However, if you add GPL Version 2 code
35 * and therefore, elected the GPL Version 2 license, then the option applies
36 * only if the new code is made subject to such option by the copyright
37 * holder.
38 */
39
40 package com.sun.faces.el;
41
42 import com.sun.faces.util.RequestStateManager;
43
44 import java.beans.FeatureDescriptor;
45 import java.util.Iterator;
46
47 import javax.el.ELResolver;
48 import javax.el.ELContext;
49 import javax.el.CompositeELResolver;
50 import javax.el.ELException;
51
52 import javax.faces.context.FacesContext;
53
54 /**
55 * Maintains an ordered composite list of child <code>ELResolver for JSF</code>.
56 *
57 */
58 public class FacesCompositeELResolver extends CompositeELResolver {
59
60 public void add(ELResolver elResolver) {
61 super.add(elResolver);
62 }
63
64 public Object getValue(ELContext context, Object base, Object property)
65 throws ELException {
66
67 context.setPropertyResolved(false);
68 if (FacesContext.getCurrentInstance() == null) {
69 return null;
70 }
71 setChainType();
72 Object result = super.getValue(context, base, property);
73 clearChainType();
74
75 return result;
76 }
77
78 public Class<?> getType(ELContext context, Object base, Object property)
79 throws ELException {
80
81 context.setPropertyResolved(false);
82 if (FacesContext.getCurrentInstance() == null) {
83 return null;
84 }
85 setChainType();
86 Class<?> result = super.getType(context, base, property);
87 clearChainType();
88
89 return result;
90 }
91
92
93 public void setValue(ELContext context, Object base, Object property,
94 Object val) throws ELException {
95 context.setPropertyResolved(false);
96 if (FacesContext.getCurrentInstance() == null) {
97 return;
98 }
99 setChainType();
100 super.setValue(context, base, property, val);
101 clearChainType();
102 }
103
104
105 public boolean isReadOnly(ELContext context, Object base, Object property)
106 throws ELException {
107 context.setPropertyResolved(false);
108 if (FacesContext.getCurrentInstance() == null) {
109 return false;
110 }
111 setChainType();
112 boolean result = super.isReadOnly(context, base, property);
113 clearChainType();
114 return result;
115 }
116
117
118 public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
119 setChainType();
120 Iterator<FeatureDescriptor> result = super.getFeatureDescriptors(context, base);
121 clearChainType();
122 return result;
123 }
124
125 public Class<?> getCommonPropertyType(ELContext context, Object base) {
126 return null;
127 }
128
129 /**
130 * <p><b>JSP</b> indicates this CompositeELResolver instance is the
131 * JSP chain, specified in section 5.6.1 of the spec.</p>
132 *
133 * <p><b>Faces</b> indicates this CompositeELResolver instance is the
134 * JSF chain, specified in section 5.6.2 of the spec.</p>
135 */
136
137 public enum ELResolverChainType {
138 JSP,
139 Faces
140 }
141
142 private ELResolverChainType chainType;
143
144 /**
145 * <p>Guarantee that this instance knows of what chain it is a
146 * member.</p>
147 * @param chainType the {@link ELResolverChainType}
148 */
149 public FacesCompositeELResolver(ELResolverChainType chainType) {
150 this.chainType = chainType;
151 }
152
153 /**
154 * <p>Set a request scoped attribute indicating what kind of chain
155 * the current expression is.</p>
156 */
157
158 private void setChainType() {
159 RequestStateManager.set(FacesContext.getCurrentInstance(),
160 RequestStateManager.EL_RESOLVER_CHAIN_TYPE_NAME,
161 chainType);
162 }
163
164 /**
165 * <p>Clear the request scoped attribute indicating what kind of
166 * chain the current expression is.</p>
167 */
168
169 private void clearChainType() {
170 RequestStateManager.remove(FacesContext.getCurrentInstance(),
171 RequestStateManager.EL_RESOLVER_CHAIN_TYPE_NAME);
172 }
173
174 }
175
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