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org.apache.commons.jelly.tags.core.GetStaticTag |
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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 | package org.apache.commons.jelly.tags.core; |
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17 | ||
18 | import org.apache.commons.jelly.JellyContext; |
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19 | import org.apache.commons.jelly.JellyTagException; |
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20 | import org.apache.commons.jelly.MissingAttributeException; |
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21 | import org.apache.commons.jelly.TagSupport; |
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22 | import org.apache.commons.jelly.XMLOutput; |
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23 | import org.apache.commons.jelly.util.ClassLoaderUtils; |
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24 | ||
25 | ||
26 | /** |
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27 | * A tag which can retrieve the value of a static field of a given class. |
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28 | * The following attributes are required:<br /> |
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29 | * <ul> |
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30 | * <li>var - The variable to which to assign the resulting value.</li> |
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31 | * <li>field - The name of the static field to retrieve.</li> |
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32 | * <li>className - The name of the class containing the static field.</li> |
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33 | * </ul> |
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34 | * |
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35 | * Example usage: |
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36 | * <pre> |
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37 | * <j:getStatic var="closeOperation" className="javax.swing.JFrame" |
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38 | * field="EXIT_ON_CLOSE"/> |
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39 | * </pre> |
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40 | * |
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41 | * @version $Revision: 1.3 $ |
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42 | */ |
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43 | ||
44 | 4 | public class GetStaticTag extends TagSupport { |
45 | ||
46 | /** The variable to which to assign the resulting value. */ |
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47 | private String var; |
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48 | ||
49 | /** The name of the static field to retrieve. */ |
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50 | private String field; |
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51 | ||
52 | /** The name of the class containing the static field. */ |
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53 | private String className; |
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54 | ||
55 | ||
56 | /** |
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57 | * Sets the name of the variable exported by this tag. |
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58 | * |
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59 | * @param var The variable name. |
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60 | */ |
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61 | ||
62 | public void setVar(String var) { |
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63 | 4 | this.var = class="keyword">var; |
64 | 4 | } |
65 | ||
66 | ||
67 | /** |
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68 | * Sets the name of the field to retrieve. |
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69 | * |
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70 | * @param method The method name |
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71 | */ |
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72 | ||
73 | public void setField(String field) { |
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74 | 4 | this.field = field; |
75 | 4 | } |
76 | ||
77 | ||
78 | /** |
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79 | * Sets the fully qualified name of the class containing the static field. |
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80 | * |
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81 | * @param className The name of the class. |
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82 | */ |
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83 | ||
84 | public void setClassName(String className) { |
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85 | 4 | this.className = className; |
86 | 4 | } |
87 | ||
88 | ||
89 | // Tag interface |
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90 | //------------------------------------------------------------------------ |
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91 | ||
92 | public void doTag(XMLOutput output) throws JellyTagException { |
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93 | 4 | String message = null; |
94 | ||
95 | 4 | if(var == null) |
96 | 0 | message = "var"; |
97 | 4 | else if(field == null) |
98 | 0 | message = "field"; |
99 | 4 | else if(className == null) |
100 | 0 | message = "className"; |
101 | ||
102 | 4 | if(message != null) |
103 | 0 | throw new MissingAttributeException(message); |
104 | ||
105 | try { |
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106 | 4 | Class type = ClassLoaderUtils.getClassLoader(getClass()).loadClass(className); |
107 | 4 | Object result = type.getField(field).get(null); |
108 | 2 | JellyContext context = getContext(); |
109 | ||
110 | 2 | context.setVariable(var, result); |
111 | ||
112 | 2 | } catch(Throwable t) { |
113 | 2 | throw |
114 | new JellyTagException("Could not access " + className + "." + |
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115 | var + ". Original exception message: " + |
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116 | t.getMessage(), t); |
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117 | } |
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118 | 2 | } |
119 | ||
120 | } |
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121 | ||
122 | ||
123 | /* Emacs configuration |
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124 | * Local variables: ** |
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125 | * mode: java ** |
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126 | * c-basic-offset: 4 ** |
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127 | * indent-tabs-mode: nil ** |
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128 | * End: ** |
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129 | */ |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |