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org.apache.commons.jelly.tags.define.BeanTag$1 |
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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.define; |
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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.jelly.JellyTagException; |
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24 | import org.apache.commons.jelly.MissingAttributeException; |
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25 | import org.apache.commons.jelly.Tag; |
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26 | import org.apache.commons.jelly.XMLOutput; |
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27 | import org.apache.commons.jelly.impl.Attribute; |
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28 | import org.apache.commons.jelly.impl.DynamicBeanTag; |
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29 | import org.apache.commons.jelly.impl.TagFactory; |
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30 | import org.apache.commons.jelly.util.ClassLoaderUtils; |
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31 | ||
32 | import org.apache.commons.logging.Log; |
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33 | import org.apache.commons.logging.LogFactory; |
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34 | ||
35 | import org.xml.sax.Attributes; |
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36 | ||
37 | /** |
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38 | * Binds a Java bean to the given named Jelly tag so that the attributes of |
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39 | * the tag set the bean properties.. |
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40 | * |
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41 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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42 | * @version $Revision: 155420 $ |
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43 | */ |
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44 | public class BeanTag extends DefineTagSupport { |
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45 | ||
46 | /** The Log to which logging calls will be made. */ |
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47 | private static final Log log = LogFactory.getLog(BeanTag.class); |
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48 | ||
49 | /** An empty Map as I think Collections.EMPTY_MAP is only JDK 1.3 onwards */ |
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50 | private static final Map EMPTY_MAP = new HashMap(); |
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51 | ||
52 | /** the name of the tag to create */ |
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53 | private String name; |
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54 | ||
55 | /** the Java class name to use for the tag */ |
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56 | private String className; |
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57 | ||
58 | /** the ClassLoader used to load beans */ |
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59 | private ClassLoader classLoader; |
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60 | ||
61 | /** the name of the attribute used for the variable name */ |
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62 | private String varAttribute = "var"; |
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63 | ||
64 | /** the attribute definitions for this dynamic tag */ |
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65 | private Map attributes; |
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66 | ||
67 | /** |
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68 | * Adds a new attribute definition to this dynamic tag |
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69 | */ |
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70 | public void addAttribute(Attribute attribute) { |
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71 | if ( attributes == null ) { |
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72 | attributes = new HashMap(); |
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73 | } |
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74 | attributes.put( attribute.getName(), attribute ); |
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75 | } |
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76 | ||
77 | // Tag interface |
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78 | //------------------------------------------------------------------------- |
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79 | public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException { |
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80 | invokeBody(output); |
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81 | ||
82 | if (name == null) { |
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83 | throw new MissingAttributeException("name"); |
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84 | } |
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85 | if (className == null) { |
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86 | throw new MissingAttributeException("className"); |
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87 | } |
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88 | ||
89 | Class theClass = null; |
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90 | try { |
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91 | ClassLoader classLoader = getClassLoader(); |
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92 | theClass = ClassLoaderUtils.loadClass(className, getClassLoader(), getContext().getUseContextClassLoader(), getClass()); |
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93 | } |
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94 | catch (ClassNotFoundException e) { |
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95 | log.error( "Could not load class: " + className + " exception: " + e, e ); |
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96 | throw new JellyTagException( |
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97 | "Could not find class: " |
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98 | + className |
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99 | + " using ClassLoader: " |
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100 | + classLoader); |
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101 | } |
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102 | ||
103 | final Class beanClass = theClass; |
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104 | final Method invokeMethod = getInvokeMethod( theClass ); |
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105 | final Map beanAttributes = (attributes != null) ? attributes : EMPTY_MAP; |
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106 | ||
107 | TagFactory factory = new TagFactory() { |
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108 | 3 | public Tag createTag(String name, Attributes attributes) { |
109 | 3 | return new DynamicBeanTag(beanClass, beanAttributes, varAttribute, invokeMethod); |
110 | } |
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111 | }; |
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112 | ||
113 | getTagLibrary().registerBeanTag(name, factory); |
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114 | ||
115 | // now lets clear the attributes for next invocation and help the GC |
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116 | attributes = null; |
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117 | } |
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118 | ||
119 | ||
120 | // Properties |
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121 | //------------------------------------------------------------------------- |
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122 | ||
123 | /** |
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124 | * Sets the name of the tag to create |
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125 | */ |
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126 | public void setName(String name) { |
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127 | this.name = name; |
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128 | } |
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129 | ||
130 | /** |
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131 | * Sets the Java class name to use for the tag |
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132 | */ |
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133 | public void setClassName(String className) { |
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134 | this.className = className; |
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135 | } |
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136 | ||
137 | /** |
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138 | * Sets the ClassLoader to use to load the class. |
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139 | * If no value is set then the current threads context class |
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140 | * loader is used. |
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141 | */ |
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142 | public void setClassLoader(ClassLoader classLoader) { |
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143 | this.classLoader = classLoader; |
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144 | } |
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145 | ||
146 | /** |
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147 | * @return the ClassLoader to use to load classes specified by this object, |
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148 | * the thread context loader if the context flag is set, or the class used to load this class. |
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149 | */ |
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150 | public ClassLoader getClassLoader() { |
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151 | return ClassLoaderUtils.getClassLoader(classLoader, getContext().getUseContextClassLoader(), getClass()); |
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152 | } |
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153 | ||
154 | /** |
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155 | * Sets the name of the attribute used to define the bean variable that this dynamic |
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156 | * tag will output its results as. This defaults to 'var' though this property |
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157 | * can be used to change this if it conflicts with a bean property called 'var'. |
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158 | */ |
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159 | public void setVarAttribute(String varAttribute) { |
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160 | this.varAttribute = varAttribute; |
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161 | } |
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162 | ||
163 | ||
164 | // Implementation methods |
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165 | //------------------------------------------------------------------------- |
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166 | ||
167 | /** |
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168 | * Extracts the invoke method for the class if one is used. |
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169 | */ |
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170 | protected Method getInvokeMethod( Class theClass ) { |
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171 | return null; |
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172 | } |
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173 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |