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org.apache.commons.jelly.tags.util.AvailableTag |
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1 | /* |
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2 | * Copyright 2002,2004 The Apache Software Foundation. |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | ||
17 | package org.apache.commons.jelly.tags.util; |
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18 | ||
19 | import java.io.File; |
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20 | import java.io.IOException; |
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21 | import java.io.InputStream; |
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22 | import java.net.MalformedURLException; |
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23 | import java.net.URL; |
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24 | ||
25 | import org.apache.commons.jelly.JellyTagException; |
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26 | import org.apache.commons.jelly.TagSupport; |
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27 | import org.apache.commons.jelly.XMLOutput; |
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28 | ||
29 | /** |
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30 | * A tag which evaluates its body if the given file is available. |
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31 | * The file can be specified via a File object or via a relative or absolute |
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32 | * URI from the current Jelly script. |
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33 | * |
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34 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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35 | * @version $Revision: 1.5 $ |
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36 | */ |
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37 | public class AvailableTag extends TagSupport { |
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38 | ||
39 | private File file; |
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40 | private String uri; |
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41 | ||
42 | 4 | public AvailableTag() { |
43 | 4 | } |
44 | ||
45 | // Tag interface |
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46 | //------------------------------------------------------------------------- |
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47 | public void doTag(final XMLOutput output) throws JellyTagException { |
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48 | 4 | boolean available = false; |
49 | ||
50 | 4 | if (file != null) { |
51 | 2 | available = file.exists(); |
52 | } |
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53 | 2 | else if (uri != null) { |
54 | try { |
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55 | 2 | URL url = context.getResource(uri); |
56 | 2 | String fileName = url.getFile(); |
57 | 2 | InputStream is = url.openStream(); |
58 | 1 | available = (is != null); |
59 | 1 | is.close(); |
60 | 1 | } catch (MalformedURLException e) { |
61 | 0 | throw new JellyTagException(e); |
62 | } catch (IOException ioe) { |
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63 | 1 | available = false; |
64 | } |
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65 | } |
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66 | ||
67 | 4 | if (available) { |
68 | 2 | invokeBody(output); |
69 | } |
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70 | 4 | } |
71 | ||
72 | // Properties |
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73 | //------------------------------------------------------------------------- |
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74 | ||
75 | ||
76 | /** |
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77 | * Returns the file. |
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78 | * @return File |
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79 | */ |
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80 | public File getFile() { |
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81 | 0 | return file; |
82 | } |
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83 | ||
84 | /** |
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85 | * Returns the uri. |
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86 | * @return String |
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87 | */ |
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88 | public String getUri() { |
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89 | 0 | return uri; |
90 | } |
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91 | ||
92 | /** |
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93 | * Sets the file to use to test whether it exists or not. |
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94 | * @param file the file to test for |
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95 | */ |
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96 | public void setFile(File file) { |
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97 | 2 | this.file = file; |
98 | 2 | } |
99 | ||
100 | /** |
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101 | * Sets the URI to use to test for availability. |
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102 | * The URI can be a full file based URL or a relative URI |
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103 | * or an absolute URI from the root context. |
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104 | * |
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105 | * @param uri the URI of the file to test |
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106 | */ |
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107 | public void setUri(String uri) { |
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108 | 2 | this.uri = uri; |
109 | 2 | } |
110 | ||
111 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |