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
20 package org.apache.myfaces.shared_orchestra.util;
21
22 import org.apache.commons.logging.Log;
23 import org.apache.commons.logging.LogFactory;
24
25 import javax.faces.context.FacesContext;
26 import javax.faces.component.UIComponent;
27 import javax.faces.component.UIInput;
28 import javax.faces.el.ValueBinding;
29 import java.util.Iterator;
30 import java.lang.reflect.Method;
31
32 /**
33 * @author Martin Marinschek (latest modification by $Author: grantsmith $)
34 * @version $Revision: 169655 $ $Date: 2005-05-11 18:45:06 +0200 (Mi, 11 Mai 2005) $
35 */
36 public class RestoreStateUtils
37 {
38 private static Log log = LogFactory.getLog(RestoreStateUtils.class);
39
40 /**
41 * Walk the component tree, executing any component-bindings to reattach
42 * components to their backing beans. Also, any UIInput component is
43 * marked as Valid.
44 * <p>
45 * Note that this method effectively breaks encapsulation; instead of
46 * asking each component to update itself and its children, this
47 * method just reaches into each component. That makes it impossible
48 * for any component to customise its behaviour at this point.
49 * <p>
50 * This has been filed as an issue against the spec. Until this
51 * issue is resolved, we'll add a new marker-interface for components
52 * to allow them to define their interest in handling children bindings themselves.
53 */
54 public static void recursivelyHandleComponentReferencesAndSetValid(FacesContext facesContext,
55 UIComponent parent)
56 {
57 recursivelyHandleComponentReferencesAndSetValid(facesContext, parent, false);
58 }
59
60 public static void recursivelyHandleComponentReferencesAndSetValid(FacesContext facesContext,
61 UIComponent parent, boolean forceHandle)
62 {
63 Method handleBindingsMethod = getBindingMethod(parent);
64
65 if(handleBindingsMethod!=null && !forceHandle)
66 {
67 try
68 {
69 handleBindingsMethod.invoke(parent,new Object[]{});
70 }
71 catch (Throwable th)
72 {
73 log.error("Exception while invoking handleBindings on component with client-id:"
74 +parent.getClientId(facesContext),th);
75 }
76 }
77 else
78 {
79 for (Iterator it = parent.getFacetsAndChildren(); it.hasNext(); )
80 {
81 UIComponent component = (UIComponent)it.next();
82
83 ValueBinding binding = component.getValueBinding("binding"); //TODO: constant
84 if (binding != null && !binding.isReadOnly(facesContext))
85 {
86 binding.setValue(facesContext, component);
87 }
88
89 if (component instanceof UIInput)
90 {
91 ((UIInput)component).setValid(true);
92 }
93
94 recursivelyHandleComponentReferencesAndSetValid(facesContext, component);
95 }
96 }
97 }
98
99 /**This is all a hack to work around a spec-bug which will be fixed in JSF2.0
100 *
101 * @param parent
102 * @return true if this component is bindingAware (e.g. aliasBean)
103 */
104 private static Method getBindingMethod(UIComponent parent)
105 {
106 Class[] clazzes = parent.getClass().getInterfaces();
107
108 for (int i = 0; i < clazzes.length; i++)
109 {
110 Class clazz = clazzes[i];
111
112 if(clazz.getName().indexOf("BindingAware")!=-1)
113 {
114 try
115 {
116 return parent.getClass().getMethod("handleBindings",new Class[]{});
117 }
118 catch (NoSuchMethodException e)
119 {
120 // return
121 }
122 }
123 }
124
125 return null;
126 }
127 }