Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
ContextAsset |
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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.asset; |
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16 | ||
17 | import java.io.InputStream; |
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18 | import java.net.URL; |
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19 | ||
20 | import org.apache.hivemind.ApplicationRuntimeException; |
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21 | import org.apache.hivemind.Location; |
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22 | import org.apache.hivemind.Resource; |
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23 | import org.apache.hivemind.util.Defense; |
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24 | import org.apache.tapestry.IAsset; |
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25 | import org.apache.tapestry.IRequestCycle; |
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26 | import org.apache.tapestry.Tapestry; |
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27 | ||
28 | /** |
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29 | * An asset whose path is relative to the {@link javax.servlet.ServletContext}containing the |
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30 | * application. |
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31 | * |
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32 | * @author Howard Lewis Ship |
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33 | */ |
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34 | ||
35 | public class ContextAsset extends AbstractAsset implements IAsset |
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36 | { |
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37 | private String _contextPath; |
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38 | ||
39 | private String _resolvedURL; |
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40 | ||
41 | private IRequestCycle _requestCycle; |
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42 | ||
43 | public ContextAsset(String contextPath, Resource resource, Location location, IRequestCycle cycle) |
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44 | { |
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45 | 3 | super(resource, location); |
46 | ||
47 | 3 | Defense.notNull(contextPath, "contextPath"); |
48 | ||
49 | 3 | _contextPath = contextPath; |
50 | ||
51 | 3 | _requestCycle = cycle; |
52 | 3 | } |
53 | ||
54 | /** |
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55 | * Generates a URL for the client to retrieve the asset. The context path is prepended to the |
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56 | * asset path, which means that assets deployed inside web applications will still work (if |
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57 | * things are configured properly). |
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58 | */ |
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59 | ||
60 | public String buildURL() |
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61 | { |
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62 | 1 | if (_resolvedURL == null) |
63 | 1 | _resolvedURL = _contextPath + getResourceLocation().getPath(); |
64 | ||
65 | 1 | return _requestCycle.encodeURL(_resolvedURL); |
66 | } |
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67 | ||
68 | public InputStream getResourceAsStream() |
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69 | { |
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70 | try |
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71 | { |
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72 | 0 | URL url = getResourceLocation().getResourceURL(); |
73 | ||
74 | 0 | return url.openStream(); |
75 | } |
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76 | 0 | catch (Exception ex) |
77 | { |
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78 | 0 | throw new ApplicationRuntimeException(Tapestry.format( |
79 | "ContextAsset.resource-missing", |
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80 | getResourceLocation()), ex); |
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81 | } |
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82 | } |
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83 | } |