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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: 155420 $ |
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| 42 | */ |
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| 43 | ||
| 44 | 26 | 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 | 26 | this.var = class="keyword">var; |
| 64 | 26 | } |
| 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 | 26 | this.field = field; |
| 75 | 26 | } |
| 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 | 26 | this.className = className; |
| 86 | 26 | } |
| 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 | 26 | String message = null; |
| 94 | ||
| 95 | 26 | if(var == null) |
| 96 | 0 | message = "var"; |
| 97 | 26 | else if(field == null) |
| 98 | 0 | message = "field"; |
| 99 | 26 | else if(className == null) |
| 100 | 0 | message = "className"; |
| 101 | ||
| 102 | 26 | if(message != null) |
| 103 | 0 | throw new MissingAttributeException(message); |
| 104 | ||
| 105 | try { |
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| 106 | 26 | Class type = ClassLoaderUtils.getClassLoader(getClass()).loadClass(className); |
| 107 | 26 | Object result = type.getField(field).get(null); |
| 108 | 13 | JellyContext context = getContext(); |
| 109 | ||
| 110 | 13 | context.setVariable(var, result); |
| 111 | ||
| 112 | 13 | } catch(Throwable t) { |
| 113 | 13 | 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 | 13 | } |
| 118 | 13 | } |
| 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. |