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 | |
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.html; | |
16 | ||
17 | import org.apache.tapestry.AbstractComponent; | |
18 | import org.apache.tapestry.IAsset; | |
19 | import org.apache.tapestry.IMarkupWriter; | |
20 | import org.apache.tapestry.IRequestCycle; | |
21 | import org.apache.tapestry.Tapestry; | |
22 | ||
23 | /** | |
24 | * Used to insert an image. To create a rollover image, use the {@link Rollover} | |
25 | * class, which integrates a link with the image assets used with the button. [<a | |
26 | * href="../../../../../components/general/image.html">Component Reference</a>] | |
27 | * | |
28 | * @author Howard Lewis Ship | |
29 | */ | |
30 | ||
31 | 0 | public abstract class Image extends AbstractComponent |
32 | { | |
33 | ||
34 | /** | |
35 | * Renders the <img> element. | |
36 | */ | |
37 | ||
38 | protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) | |
39 | { | |
40 | // Doesn't contain a body so no need to do anything on rewind (assumes | |
41 | // no | |
42 | // sideffects to accessor methods via bindings). | |
43 | ||
44 | 0 | if (cycle.isRewinding()) return; |
45 | ||
46 | 0 | IAsset imageAsset = getImage(); |
47 | ||
48 | 0 | if (imageAsset == null) |
49 | 0 | throw Tapestry.createRequiredParameterException(this, "image"); |
50 | ||
51 | 0 | String imageURL = imageAsset.buildURL(); |
52 | ||
53 | 0 | writer.beginEmpty("img"); |
54 | ||
55 | 0 | writer.attribute("src", imageURL); |
56 | ||
57 | 0 | renderInformalParameters(writer, cycle); |
58 | ||
59 | 0 | writer.closeTag(); |
60 | 0 | } |
61 | ||
62 | public abstract IAsset getImage(); | |
63 | } |