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org.apache.commons.jelly.tags.util.PropertiesTag |
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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.FileInputStream; |
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21 | import java.io.FileNotFoundException; |
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22 | import java.io.InputStream; |
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23 | import java.io.IOException; |
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24 | import java.util.Enumeration; |
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25 | import java.util.Properties; |
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26 | ||
27 | import org.apache.commons.jelly.JellyTagException; |
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28 | import org.apache.commons.jelly.TagSupport; |
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29 | import org.apache.commons.jelly.XMLOutput; |
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30 | ||
31 | /** |
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32 | * A tag which loads a properties file from a given file name or URI |
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33 | * which are loaded into the current context. |
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34 | * |
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35 | * @author Jim Birchfield |
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36 | * @version $Revision: 1.6 $ |
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37 | */ |
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38 | public class PropertiesTag extends TagSupport { |
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39 | private String file; |
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40 | private String uri; |
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41 | private String var; |
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42 | ||
43 | 2 | public PropertiesTag() { |
44 | 2 | } |
45 | ||
46 | // Tag interface |
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47 | //------------------------------------------------------------------------- |
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48 | public void doTag(final XMLOutput output) throws JellyTagException { |
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49 | 2 | if (file == null && uri == class="keyword">null) { |
50 | 0 | throw new JellyTagException("This tag must define a 'file' or 'uri' attribute"); |
51 | } |
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52 | 2 | InputStream is = null; |
53 | 2 | if (file != null) { |
54 | 0 | File f = new File(file); |
55 | 0 | if (!f.exists()) { |
56 | 0 | throw new JellyTagException("file: " + file + " does not exist!"); |
57 | } |
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58 | ||
59 | try { |
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60 | 0 | is = new FileInputStream(f); |
61 | 0 | } catch (FileNotFoundException e) { |
62 | 0 | throw new JellyTagException(e); |
63 | 0 | } |
64 | } |
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65 | else { |
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66 | 2 | is = context.getResourceAsStream(uri); |
67 | 2 | if (is == null) { |
68 | 0 | throw new JellyTagException( "Could not find: " + uri ); |
69 | } |
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70 | } |
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71 | 2 | Properties props = new Properties(); |
72 | ||
73 | try { |
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74 | 2 | props.load(is); |
75 | 2 | } catch (IOException e) { |
76 | 0 | throw new JellyTagException("properties tag could not load from file",e); |
77 | } |
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78 | ||
79 | 2 | if (var != null) { |
80 | 1 | context.setVariable(var, props); |
81 | } |
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82 | else { |
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83 | 1 | Enumeration propsEnum = props.propertyNames(); |
84 | 4 | while (propsEnum.hasMoreElements()) { |
85 | 2 | String key = (String) propsEnum.nextElement(); |
86 | 2 | String value = props.getProperty(key); |
87 | ||
88 | // @todo we should parse the value in case its an Expression |
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89 | 2 | context.setVariable(key, value); |
90 | } |
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91 | } |
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92 | ||
93 | 2 | } |
94 | ||
95 | // Properties |
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96 | //------------------------------------------------------------------------- |
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97 | ||
98 | /** |
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99 | * Sets the file name to be used to load the properties file. |
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100 | */ |
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101 | public void setFile(String file) { |
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102 | 0 | this.file = file; |
103 | 0 | } |
104 | ||
105 | /** |
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106 | * Sets the URI of the properties file to use. This can be a full URL or a relative URI |
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107 | * or an absolute URI to the root context of this JellyContext. |
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108 | */ |
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109 | public void setUri(String uri) { |
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110 | 2 | this.uri = uri; |
111 | 2 | } |
112 | ||
113 | /** |
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114 | * If this is defined then a Properties object containing all the |
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115 | * properties will be created and exported, otherwise the current variable |
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116 | * scope will be set to the value of the properties. |
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117 | * |
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118 | * @param var The var to set |
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119 | */ |
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120 | public void setVar(String var) { |
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121 | 1 | this.var = class="keyword">var; |
122 | 1 | } |
123 | ||
124 | } |
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