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Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
Radio.java | 100% | 100% | 100% | 100% |
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1 | // Copyright 2004, 2005 The Apache Software Foundation | |
2 | // | |
3 | // Licensed under the Apache License, Version 2.0 (the "License"); | |
4 | // you may not use this file except in compliance with the License. | |
5 | // You may obtain a copy of the License at | |
6 | // | |
7 | // http://www.apache.org/licenses/LICENSE-2.0 | |
8 | // | |
9 | // Unless required by applicable law or agreed to in writing, software | |
10 | // distributed under the License is distributed on an "AS IS" BASIS, | |
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
12 | // See the License for the specific language governing permissions and | |
13 | // limitations under the License. | |
14 | ||
15 | package org.apache.tapestry.form; | |
16 | ||
17 | import org.apache.hivemind.ApplicationRuntimeException; | |
18 | import org.apache.tapestry.AbstractComponent; | |
19 | import org.apache.tapestry.IMarkupWriter; | |
20 | import org.apache.tapestry.IRequestCycle; | |
21 | import org.apache.tapestry.Tapestry; | |
22 | ||
23 | /** | |
24 | * Implements a component that manages an HTML <input type=radio> form element. | |
25 | * Such a component must be wrapped (possibly indirectly) | |
26 | * inside a {@link RadioGroup} component. | |
27 | * | |
28 | * [<a href="../../../../../ComponentReference/Radio.html">Component Reference</a>] | |
29 | * | |
30 | * | |
31 | * <p>{@link Radio} and {@link RadioGroup} are generally not used (except | |
32 | * for very special cases). Instead, a {@link PropertySelection} component is used. | |
33 | * | |
34 | * | |
35 | * @author Howard Lewis Ship | |
36 | * | |
37 | **/ | |
38 | ||
39 | public abstract class Radio extends AbstractComponent | |
40 | { | |
41 | /** | |
42 | * Renders the form element, or responds when the form containing the element | |
43 | * is submitted (by checking {@link Form#isRewinding()}. | |
44 | * | |
45 | * | |
46 | **/ | |
47 | ||
48 | 70 | protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) |
49 | { | |
50 | ||
51 | 70 | RadioGroup group = RadioGroup.get(cycle); |
52 | 70 | if (group == null) |
53 | 1 | throw new ApplicationRuntimeException( |
54 | Tapestry.getMessage("Radio.must-be-contained-by-group"), | |
55 | this, | |
56 | null, | |
57 | null); | |
58 | ||
59 | // The group determines rewinding from the form. | |
60 | ||
61 | 69 | boolean rewinding = group.isRewinding(); |
62 | ||
63 | 69 | int option = group.getNextOptionId(); |
64 | ||
65 | 69 | if (rewinding) |
66 | { | |
67 | // If not disabled and this is the selected button within the radio group, | |
68 | // then update set the selection from the group to the value for this | |
69 | // radio button. This will update the selected parameter of the RadioGroup. | |
70 | ||
71 | 23 | if (!isDisabled() && !group.isDisabled() && group.isSelected(option)) |
72 | 3 | group.updateSelection(getValue()); |
73 | 23 | return; |
74 | } | |
75 | ||
76 | 46 | writer.beginEmpty("input"); |
77 | ||
78 | 46 | writer.attribute("type", "radio"); |
79 | ||
80 | 46 | writer.attribute("name", group.getName()); |
81 | ||
82 | // As the group if the value for this Radio matches the selection | |
83 | // for the group as a whole; if so this is the default radio and is checked. | |
84 | ||
85 | 46 | if (group.isSelection(getValue())) |
86 | 11 | writer.attribute("checked", "checked"); |
87 | ||
88 | 46 | if (isDisabled() || group.isDisabled()) |
89 | 13 | writer.attribute("disabled", "disabled"); |
90 | ||
91 | // The value for the Radio matches the option number (provided by the RadioGroup). | |
92 | // When the form is submitted, the RadioGroup will know which option was, | |
93 | // in fact, selected by the user. | |
94 | ||
95 | 46 | writer.attribute("value", option); |
96 | ||
97 | 46 | renderInformalParameters(writer, cycle); |
98 | ||
99 | } | |
100 | ||
101 | public abstract boolean isDisabled(); | |
102 | ||
103 | public abstract Object getValue(); | |
104 | } |
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