Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
AttributeTag |
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| 0.0;0 |
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.servlet.jsp.tagext.TagSupport; | |
22 | import javax.servlet.jsp.JspException; | |
23 | import javax.faces.webapp.UIComponentClassicTagBase; | |
24 | import javax.faces.webapp.UIComponentELTag; | |
25 | import javax.faces.component.UIComponent; | |
26 | import javax.faces.context.FacesContext; | |
27 | import javax.el.ValueExpression; | |
28 | import javax.el.ELContext; | |
29 | ||
30 | import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFJspAttribute; | |
31 | import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFJspTag; | |
32 | ||
33 | /** | |
34 | * This tag associates an attribute with the nearest parent | |
35 | * UIComponent. | |
36 | * <p> | |
37 | * When the value is not an EL expression, this tag has the same effect | |
38 | * as calling component.getAttributes.put(name, value). When the attribute | |
39 | * name specified matches a standard property of the component, that | |
40 | * property is set. However it is also valid to assign attributes | |
41 | * to components using any arbitrary name; the component itself won't | |
42 | * make any use of these but other objects such as custom renderers, | |
43 | * validators or action listeners can later retrieve the attribute | |
44 | * from the component by name. | |
45 | * </p> | |
46 | * <p> | |
47 | * When the value is an EL expression, this tag has the same effect | |
48 | * as calling component.setValueBinding. A call to method | |
49 | * component.getAttributes().get(name) will then cause that | |
50 | * expression to be evaluated and the result of the expression is | |
51 | * returned, not the original EL expression string. | |
52 | * </p> | |
53 | * <p> | |
54 | * See the javadoc for UIComponent.getAttributes for more details. | |
55 | * </p> | |
56 | * <p> | |
57 | * Unless otherwise specified, all attributes accept static values | |
58 | * or EL expressions. | |
59 | * </p> | |
60 | * | |
61 | * @author Manfred Geiler (latest modification by $Author: lu4242 $) | |
62 | * @author Bruno Aranda (JSR-252) | |
63 | * @version $Revision: 693358 $ $Date: 2008-09-08 22:54:29 -0500 (Mon, 08 Sep 2008) $ | |
64 | */ | |
65 | @JSFJspTag( | |
66 | name="f:attribute", | |
67 | bodyContent="empty") | |
68 | 0 | public class AttributeTag |
69 | extends TagSupport | |
70 | { | |
71 | private static final long serialVersionUID = 31476300171678632L; | |
72 | private ValueExpression _nameExpression; | |
73 | private ValueExpression _valueExpression; | |
74 | ||
75 | /** | |
76 | * The name of the attribute. | |
77 | * | |
78 | * @param nameExpression | |
79 | */ | |
80 | @JSFJspAttribute( | |
81 | rtexprvalue=true, | |
82 | className="java.lang.String") | |
83 | public void setName(ValueExpression nameExpression) | |
84 | { | |
85 | 0 | _nameExpression = nameExpression; |
86 | 0 | } |
87 | ||
88 | /** | |
89 | * The attribute's value. | |
90 | * | |
91 | * @param valueExpression | |
92 | */ | |
93 | @JSFJspAttribute( | |
94 | rtexprvalue=true, | |
95 | className="java.lang.Object") | |
96 | public void setValue(ValueExpression valueExpression) | |
97 | { | |
98 | 0 | _valueExpression = valueExpression; |
99 | 0 | } |
100 | ||
101 | ||
102 | public int doStartTag() throws JspException | |
103 | { | |
104 | 0 | UIComponentClassicTagBase componentTag = UIComponentELTag.getParentUIComponentClassicTagBase(pageContext); |
105 | 0 | if (componentTag == null) |
106 | { | |
107 | 0 | throw new JspException("no parent UIComponentTag found"); |
108 | } | |
109 | 0 | UIComponent component = componentTag.getComponentInstance(); |
110 | 0 | if (component == null) |
111 | { | |
112 | 0 | throw new JspException("parent UIComponentTag has no UIComponent"); |
113 | } | |
114 | ||
115 | 0 | FacesContext facesContext = FacesContext.getCurrentInstance(); |
116 | 0 | ELContext elContext = facesContext.getELContext(); |
117 | ||
118 | 0 | String name = null; |
119 | 0 | Object value = null; |
120 | 0 | boolean isLiteral = false; |
121 | ||
122 | 0 | if (_nameExpression != null) |
123 | { | |
124 | 0 | name = (String) _nameExpression.getValue(elContext); |
125 | } | |
126 | ||
127 | 0 | if (_valueExpression != null) |
128 | { | |
129 | 0 | isLiteral = _valueExpression.isLiteralText(); |
130 | 0 | value = _valueExpression.getValue(elContext); |
131 | } | |
132 | ||
133 | 0 | if (name != null) |
134 | { | |
135 | 0 | if (component.getAttributes().get(name) == null) |
136 | { | |
137 | 0 | if (isLiteral) |
138 | { | |
139 | 0 | component.getAttributes().put(name, value); |
140 | } | |
141 | else | |
142 | { | |
143 | 0 | component.setValueExpression(name, _valueExpression); |
144 | } | |
145 | } | |
146 | } | |
147 | ||
148 | 0 | return SKIP_BODY; |
149 | } | |
150 | ||
151 | /** | |
152 | * @deprecated | |
153 | */ | |
154 | public void release() | |
155 | { | |
156 | 0 | super.release(); |
157 | 0 | _nameExpression = null; |
158 | 0 | _valueExpression = null; |
159 | 0 | } |
160 | ||
161 | } |