Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
DelegateValueChangeListener |
|
| 2.111111111111111;2.111 |
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.taglib.core; | |
20 | ||
21 | import javax.el.ELException; | |
22 | import javax.el.ValueExpression; | |
23 | import javax.faces.FacesException; | |
24 | import javax.faces.component.StateHolder; | |
25 | import javax.faces.context.FacesContext; | |
26 | import javax.faces.event.AbortProcessingException; | |
27 | import javax.faces.event.ValueChangeEvent; | |
28 | import javax.faces.event.ValueChangeListener; | |
29 | ||
30 | /** | |
31 | * This class is used in conjunction with ValueChangeListenerTag. | |
32 | * | |
33 | * When a tag like this is in a jsp page: | |
34 | * | |
35 | * <f:valueChangeListener binding="#{mybean}"/> | |
36 | * | |
37 | * or | |
38 | * | |
39 | * <f:valueChangeListener type="#{'anyid'}" binding="#{mybean}"/> | |
40 | * | |
41 | * The value of mybean could be already on the context, so this converter avoid creating a new variable and use the | |
42 | * previous one. | |
43 | * | |
44 | * @author Leonardo Uribe (latest modification by $Author$) | |
45 | * @version $Revision$ $Date$ | |
46 | */ | |
47 | public class DelegateValueChangeListener implements ValueChangeListener, StateHolder | |
48 | { | |
49 | ||
50 | private ValueExpression _type; | |
51 | private ValueExpression _binding; | |
52 | ||
53 | public DelegateValueChangeListener() | |
54 | 0 | { |
55 | 0 | } |
56 | ||
57 | public DelegateValueChangeListener(ValueExpression type, ValueExpression binding) | |
58 | { | |
59 | 0 | super(); |
60 | 0 | _type = type; |
61 | 0 | _binding = binding; |
62 | 0 | } |
63 | ||
64 | public boolean isTransient() | |
65 | { | |
66 | 0 | return false; |
67 | } | |
68 | ||
69 | public void restoreState(FacesContext facesContext, Object state) | |
70 | { | |
71 | 0 | Object[] values = (Object[]) state; |
72 | 0 | _type = (ValueExpression) values[0]; |
73 | 0 | _binding = (ValueExpression) values[1]; |
74 | 0 | } |
75 | ||
76 | public Object saveState(FacesContext facesContext) | |
77 | { | |
78 | 0 | Object[] values = new Object[2]; |
79 | 0 | values[0] = _type; |
80 | 0 | values[1] = _binding; |
81 | 0 | return values; |
82 | } | |
83 | ||
84 | public void setTransient(boolean arg0) | |
85 | { | |
86 | // Do nothing | |
87 | 0 | } |
88 | ||
89 | private ValueChangeListener _getDelegate() | |
90 | { | |
91 | 0 | return _createValueChangeListener(); |
92 | } | |
93 | ||
94 | private ValueChangeListener _createValueChangeListener() | |
95 | { | |
96 | 0 | FacesContext facesContext = FacesContext.getCurrentInstance(); |
97 | 0 | ValueChangeListener listener = null; |
98 | // type and/or binding must be specified | |
99 | try | |
100 | { | |
101 | 0 | if (null != _binding) |
102 | { | |
103 | try | |
104 | { | |
105 | 0 | listener = (ValueChangeListener)_binding.getValue(facesContext.getELContext()); |
106 | 0 | if (null != listener) |
107 | { | |
108 | 0 | return listener; |
109 | } | |
110 | } | |
111 | 0 | catch (ELException e) |
112 | { | |
113 | // throw new JspException("Exception while evaluating the binding attribute of Component " | |
114 | // + component.getId(), e); | |
115 | 0 | } |
116 | } | |
117 | ||
118 | 0 | if (null != _type) |
119 | { | |
120 | // FIXME: The listener never get created, check when this class is really used. | |
121 | /*String className; | |
122 | if (_type.isLiteralText()) | |
123 | { | |
124 | className = _type.getExpressionString(); | |
125 | } | |
126 | else | |
127 | { | |
128 | className = (String) _type.getValue(facesContext.getELContext()); | |
129 | }*/ | |
130 | ||
131 | 0 | listener = null; |
132 | // listener = (ActionListener) ClassUtils.newInstance(className); | |
133 | 0 | if (null != _binding) |
134 | { | |
135 | try | |
136 | { | |
137 | 0 | _binding.setValue(facesContext.getELContext(), listener); |
138 | } | |
139 | 0 | catch (ELException e) |
140 | { | |
141 | // throw new JspException("Exception while evaluating the binding attribute of Component " | |
142 | // + component.getId(), e); | |
143 | 0 | } |
144 | } | |
145 | ||
146 | 0 | return listener; |
147 | } | |
148 | } | |
149 | 0 | catch (ClassCastException e) |
150 | { | |
151 | 0 | throw new FacesException(e); |
152 | 0 | } |
153 | ||
154 | 0 | return listener; |
155 | } | |
156 | ||
157 | public void processValueChange(ValueChangeEvent event) throws AbortProcessingException | |
158 | { | |
159 | 0 | _getDelegate().processValueChange(event); |
160 | 0 | } |
161 | } |