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org.apache.commons.jelly.tags.bean.BeandefTag |
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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.bean; |
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18 | ||
19 | import java.lang.reflect.Method; |
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20 | import java.util.HashMap; |
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21 | import java.util.Map; |
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22 | ||
23 | import org.apache.commons.beanutils.MethodUtils; |
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24 | import org.apache.commons.jelly.JellyTagException; |
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25 | import org.apache.commons.jelly.MissingAttributeException; |
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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 | import org.apache.commons.jelly.util.ClassLoaderUtils; |
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29 | import org.apache.commons.logging.Log; |
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30 | import org.apache.commons.logging.LogFactory; |
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31 | ||
32 | ||
33 | /** |
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34 | * Binds a Java bean to the given named Jelly tag so that the attributes of |
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35 | * the tag set the bean properties.. |
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36 | * |
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37 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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38 | * @version $Revision: 1.8 $ |
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39 | */ |
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40 | 1 | public class BeandefTag extends TagSupport { |
41 | ||
42 | /** The Log to which logging calls will be made. */ |
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43 | 2 | private static final Log log = LogFactory.getLog(BeandefTag.class); |
44 | ||
45 | /** An empty Map as I think Collections.EMPTY_MAP is only JDK 1.3 onwards */ |
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46 | 1 | private static final Map EMPTY_MAP = new HashMap(); |
47 | ||
48 | 1 | protected static final Class[] EMPTY_ARGUMENT_TYPES = {}; |
49 | ||
50 | /** the name of the tag to create */ |
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51 | private String name; |
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52 | ||
53 | /** the Java class name to use for the tag */ |
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54 | private String className; |
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55 | ||
56 | /** the name of the invoke method */ |
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57 | private String methodName; |
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58 | ||
59 | /** the ClassLoader used to load beans */ |
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60 | private ClassLoader classLoader; |
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61 | ||
62 | /** the library in which to define this new bean tag */ |
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63 | private BeanTagLibrary library; |
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64 | ||
65 | 2 | public BeandefTag(BeanTagLibrary library) { |
66 | 2 | this.library = library; |
67 | 2 | } |
68 | ||
69 | // Tag interface |
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70 | //------------------------------------------------------------------------- |
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71 | public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException { |
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72 | 2 | invokeBody(output); |
73 | ||
74 | 2 | if (name == null) { |
75 | 0 | throw new MissingAttributeException("name"); |
76 | } |
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77 | 2 | if (className == null) { |
78 | 0 | throw new MissingAttributeException("className"); |
79 | } |
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80 | ||
81 | 2 | Class theClass = null; |
82 | try { |
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83 | 2 | theClass = ClassLoaderUtils.loadClass(className, classLoader, getContext().getUseContextClassLoader(), getClass()); |
84 | 2 | } catch (ClassNotFoundException e) { |
85 | 0 | log.error( "Could not load class: " + className + " exception: " + e, e ); |
86 | 0 | throw new JellyTagException("Could not find class: " |
87 | + className |
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88 | + " using ClassLoader: " |
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89 | + classLoader); |
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90 | } |
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91 | ||
92 | 2 | Method invokeMethod = getInvokeMethod(theClass); |
93 | ||
94 | // @todo should we allow the variable name to be specified? |
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95 | 2 | library.registerBean(name, theClass, invokeMethod); |
96 | 2 | } |
97 | ||
98 | ||
99 | // Properties |
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100 | //------------------------------------------------------------------------- |
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101 | ||
102 | /** |
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103 | * Sets the name of the tag to create |
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104 | */ |
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105 | public void setName(String name) { |
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106 | 2 | this.name = name; |
107 | 2 | } |
108 | ||
109 | /** |
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110 | * Sets the Java class name to use for the tag |
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111 | */ |
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112 | public void setClassName(String className) { |
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113 | 2 | this.className = className; |
114 | 2 | } |
115 | ||
116 | /** |
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117 | * Sets the ClassLoader to use to load the class. |
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118 | * If no value is set then the current threads context class |
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119 | * loader is used. |
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120 | */ |
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121 | public void setClassLoader(ClassLoader classLoader) { |
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122 | 0 | this.classLoader = classLoader; |
123 | 0 | } |
124 | ||
125 | /** |
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126 | * @return the ClassLoader to use to load classes |
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127 | * or will use the thread context loader if none is specified. |
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128 | */ |
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129 | public ClassLoader getClassLoader() { |
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130 | 0 | return ClassLoaderUtils.getClassLoader(classLoader, true, getClass()); |
131 | } |
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132 | ||
133 | /** |
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134 | * @return String |
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135 | */ |
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136 | public String getMethodName() { |
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137 | 0 | return methodName; |
138 | } |
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139 | ||
140 | /** |
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141 | * Sets the methodName. |
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142 | * @param methodName The methodName to set |
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143 | */ |
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144 | public void setMethodName(String methodName) { |
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145 | 1 | this.methodName = methodName; |
146 | 1 | } |
147 | ||
148 | // Implementation methods |
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149 | //------------------------------------------------------------------------- |
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150 | protected Method getInvokeMethod(Class theClass) { |
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151 | 2 | if (methodName != null) { |
152 | // lets lookup the method name |
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153 | 1 | return MethodUtils.getAccessibleMethod(theClass, methodName, EMPTY_ARGUMENT_TYPES); |
154 | } |
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155 | 1 | return null; |
156 | } |
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157 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |