Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
Conditional |
|
| 1.8;1.8 |
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. | |
24 | * | |
25 | * @author Howard Lewis Ship, David Solis | |
26 | */ | |
27 | ||
28 | 0 | public abstract class Conditional extends AbstractComponent |
29 | { | |
30 | /** | |
31 | * Renders its wrapped components only if the condition is true (technically, if condition | |
32 | * matches invert). Additionally, if element is specified, can emulate that HTML element if | |
33 | * condition is met | |
34 | */ | |
35 | ||
36 | protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) | |
37 | { | |
38 | 0 | if (evaluateCondition()) |
39 | { | |
40 | 0 | String element = getElement(); |
41 | ||
42 | 0 | boolean render = !cycle.isRewinding() && HiveMind.isNonBlank(element); |
43 | ||
44 | 0 | if (render) |
45 | { | |
46 | 0 | writer.begin(element); |
47 | 0 | renderInformalParameters(writer, cycle); |
48 | } | |
49 | ||
50 | 0 | renderBody(writer, cycle); |
51 | ||
52 | 0 | if (render) |
53 | 0 | writer.end(element); |
54 | } | |
55 | 0 | } |
56 | ||
57 | protected boolean evaluateCondition() | |
58 | { | |
59 | 0 | return getCondition() != getInvert(); |
60 | } | |
61 | ||
62 | public abstract boolean getCondition(); | |
63 | ||
64 | public abstract boolean getInvert(); | |
65 | ||
66 | public abstract String getElement(); | |
67 | } |