Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
BaseComponent |
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| 2.0;2 |
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; |
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16 | ||
17 | import org.apache.commons.logging.Log; |
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18 | import org.apache.commons.logging.LogFactory; |
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19 | import org.apache.tapestry.engine.IPageLoader; |
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20 | import org.apache.tapestry.spec.IComponentSpecification; |
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21 | ||
22 | /** |
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23 | * Base implementation for most components that use an HTML template. |
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24 | * |
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25 | * @author Howard Lewis Ship |
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26 | */ |
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27 | ||
28 | 35 | public abstract class BaseComponent extends AbstractComponent implements ITemplateComponent |
29 | { |
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30 | 2 | private static final Log LOG = LogFactory.getLog(BaseComponent.class); |
31 | ||
32 | private static final int OUTER_INIT_SIZE = 5; |
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33 | ||
34 | private IRender[] _outer; |
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35 | ||
36 | 35 | private int _outerCount = 0; |
37 | ||
38 | /** |
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39 | * Adds an element as an outer element for the receiver. Outer elements are elements that should |
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40 | * be directly rendered by the receiver's <code>render()</code> method. That is, they are |
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41 | * top-level elements on the HTML template. |
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42 | */ |
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43 | ||
44 | public void addOuter(IRender element) |
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45 | { |
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46 | 50 | if (_outer == null) |
47 | { |
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48 | 1 | _outer = new IRender[OUTER_INIT_SIZE]; |
49 | 1 | _outer[0] = element; |
50 | ||
51 | 1 | _outerCount = 1; |
52 | 1 | return; |
53 | } |
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54 | ||
55 | // No more room? Make the array bigger. |
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56 | ||
57 | 49 | if (_outerCount == _outer.length) |
58 | { |
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59 | IRender[] newOuter; |
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60 | ||
61 | 4 | newOuter = new IRender[_outer.length * 2]; |
62 | ||
63 | 4 | System.arraycopy(_outer, 0, newOuter, 0, _outerCount); |
64 | ||
65 | 4 | _outer = newOuter; |
66 | } |
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67 | ||
68 | 49 | _outer[_outerCount++] = element; |
69 | 49 | } |
70 | ||
71 | public IRender[] getContainedRenderers() |
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72 | { |
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73 | 0 | return _outer; |
74 | } |
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75 | ||
76 | public IRender[] getInnerRenderers() |
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77 | { |
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78 | 0 | return _body; |
79 | } |
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80 | ||
81 | /** |
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82 | * Reads the receiver's template and figures out which elements wrap which other elements. |
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83 | * |
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84 | * @param cycle |
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85 | * The current request. |
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86 | * @param loader |
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87 | * The service responsible for loading / resolving a page spec. |
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88 | */ |
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89 | ||
90 | private void readTemplate(IRequestCycle cycle, IPageLoader loader) |
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91 | { |
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92 | 0 | loader.loadTemplateForComponent(cycle, this); |
93 | 0 | } |
94 | ||
95 | /** |
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96 | * Renders the top level components contained by the receiver. |
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97 | * |
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98 | * @since 2.0.3 |
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99 | */ |
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100 | ||
101 | protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) |
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102 | { |
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103 | 1 | if (LOG.isDebugEnabled()) |
104 | 0 | LOG.debug("Begin render " + getExtendedId()); |
105 | ||
106 | 51 | for (int i = 0; i < _outerCount; i++) |
107 | 50 | cycle.getResponseBuilder().render(writer, _outer[i], cycle); |
108 | ||
109 | 1 | if (LOG.isDebugEnabled()) |
110 | 0 | LOG.debug("End render " + getExtendedId()); |
111 | 1 | } |
112 | ||
113 | /** |
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114 | * Loads the template for the component, then invokes |
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115 | * {@link AbstractComponent#finishLoad(IRequestCycle, IPageLoader, IComponentSpecification)}. |
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116 | * Subclasses must invoke this method first, before adding any additional behavior, though its |
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117 | * usually simpler to override {@link #finishLoad()}instead. |
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118 | */ |
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119 | ||
120 | public void finishLoad(IRequestCycle cycle, IPageLoader loader, IComponentSpecification specification) |
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121 | { |
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122 | 0 | readTemplate(cycle, loader); |
123 | ||
124 | 0 | super.finishLoad(cycle, loader, specification); |
125 | 0 | } |
126 | } |