Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
Conditional |
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| 1.6;1.6 |
1 | // Copyright 2004, 2005 The Apache Software Foundation |
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2 | // |
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3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
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4 | // you may not use this file except in compliance with the License. |
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5 | // You may obtain a copy of the License at |
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6 | // |
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7 | // http://www.apache.org/licenses/LICENSE-2.0 |
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8 | // |
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9 | // Unless required by applicable law or agreed to in writing, software |
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10 | // distributed under the License is distributed on an "AS IS" BASIS, |
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11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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12 | // See the License for the specific language governing permissions and |
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13 | // limitations under the License. |
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14 | ||
15 | package org.apache.tapestry.components; |
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16 | ||
17 | import org.apache.hivemind.HiveMind; |
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18 | import org.apache.tapestry.AbstractComponent; |
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19 | import org.apache.tapestry.IMarkupWriter; |
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20 | import org.apache.tapestry.IRequestCycle; |
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21 | ||
22 | /** |
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23 | * A conditional element on a page which will render its wrapped elements zero or one times. [ <a |
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24 | * href="../../../../../ComponentReference/Conditional.html">Component Reference </a>] |
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25 | * |
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26 | * @author Howard Lewis Ship, David Solis |
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27 | */ |
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28 | ||
29 | 5 | public abstract class Conditional extends AbstractComponent |
30 | { |
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31 | /** |
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32 | * Renders its wrapped components only if the condition is true (technically, if condition |
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33 | * matches invert). Additionally, if element is specified, can emulate that HTML element if |
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34 | * condition is met |
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35 | */ |
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36 | ||
37 | protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) |
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38 | { |
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39 | 5 | if (evaluateCondition()) |
40 | { |
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41 | 3 | String element = getElement(); |
42 | ||
43 | 3 | boolean render = !cycle.isRewinding() && HiveMind.isNonBlank(element); |
44 | ||
45 | 3 | if (render) |
46 | { |
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47 | 1 | writer.begin(element); |
48 | 1 | renderInformalParameters(writer, cycle); |
49 | } |
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50 | ||
51 | 3 | renderBody(writer, cycle); |
52 | ||
53 | 3 | if (render) |
54 | 1 | writer.end(element); |
55 | } |
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56 | 5 | } |
57 | ||
58 | protected boolean evaluateCondition() |
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59 | { |
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60 | 5 | return getCondition() != getInvert(); |
61 | } |
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62 | ||
63 | public abstract boolean getCondition(); |
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64 | ||
65 | public abstract boolean getInvert(); |
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66 | ||
67 | public abstract String getElement(); |
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68 | } |