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Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
Conditional.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.components; | |
16 | ||
17 | import org.apache.hivemind.HiveMind; | |
18 | import org.apache.tapestry.AbstractComponent; | |
19 | import org.apache.tapestry.IMarkupWriter; | |
20 | import org.apache.tapestry.IRequestCycle; | |
21 | ||
22 | /** | |
23 | * A conditional element on a page which will render its wrapped elements zero or one times. [ <a | |
24 | * href="../../../../../ComponentReference/Conditional.html">Component Reference </a>] | |
25 | * | |
26 | * @author Howard Lewis Ship, David Solis | |
27 | */ | |
28 | ||
29 | public abstract class Conditional extends AbstractComponent | |
30 | { | |
31 | /** | |
32 | * Renders its wrapped components only if the condition is true (technically, if condition | |
33 | * matches invert). Additionally, if element is specified, can emulate that HTML element if | |
34 | * condition is met | |
35 | */ | |
36 | ||
37 | 12 | protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) |
38 | { | |
39 | 12 | if (evaluateCondition()) |
40 | { | |
41 | 8 | String element = getElement(); |
42 | ||
43 | 8 | boolean render = !cycle.isRewinding() && HiveMind.isNonBlank(element); |
44 | ||
45 | 8 | if (render) |
46 | { | |
47 | 2 | writer.begin(element); |
48 | 2 | renderInformalParameters(writer, cycle); |
49 | } | |
50 | ||
51 | 8 | renderBody(writer, cycle); |
52 | ||
53 | 8 | if (render) |
54 | 2 | writer.end(element); |
55 | } | |
56 | } | |
57 | ||
58 | 12 | protected boolean evaluateCondition() |
59 | { | |
60 | 12 | return getCondition() != getInvert(); |
61 | } | |
62 | ||
63 | public abstract boolean getCondition(); | |
64 | ||
65 | public abstract boolean getInvert(); | |
66 | ||
67 | public abstract String getElement(); | |
68 | } |
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