Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
Image |
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| 3.0;3 |
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.html; |
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16 | ||
17 | import org.apache.tapestry.AbstractComponent; |
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18 | import org.apache.tapestry.IAsset; |
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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 | import org.apache.tapestry.Tapestry; |
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22 | ||
23 | /** |
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24 | * Used to insert an image. To create a rollover image, use the {@link Rollover} |
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25 | * class, which integrates a link with the image assets used with the button. [<a |
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26 | * href="../../../../../ComponentReference/Image.html">Component Reference</a>] |
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27 | * |
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28 | * @author Howard Lewis Ship |
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29 | */ |
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30 | ||
31 | 3 | public abstract class Image extends AbstractComponent |
32 | { |
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33 | ||
34 | /** |
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35 | * Renders the <img> element. |
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36 | */ |
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37 | ||
38 | protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) |
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39 | { |
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40 | // Doesn't contain a body so no need to do anything on rewind (assumes |
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41 | // no |
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42 | // sideffects to accessor methods via bindings). |
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43 | ||
44 | 3 | if (cycle.isRewinding()) return; |
45 | ||
46 | 2 | IAsset imageAsset = getImage(); |
47 | ||
48 | 2 | if (imageAsset == null) |
49 | 1 | throw Tapestry.createRequiredParameterException(this, "image"); |
50 | ||
51 | 1 | String imageURL = imageAsset.buildURL(); |
52 | ||
53 | 1 | writer.beginEmpty("img"); |
54 | ||
55 | 1 | writer.attribute("src", imageURL); |
56 | ||
57 | 1 | renderInformalParameters(writer, cycle); |
58 | ||
59 | 1 | writer.closeTag(); |
60 | 1 | } |
61 | ||
62 | public abstract IAsset getImage(); |
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63 | } |