Coverage report

  %line %branch
org.apache.commons.jelly.tags.bean.BeandefTag
76% 
97% 

 1  
 /*
 2  
  * Copyright 2002,2004 The Apache Software Foundation.
 3  
  *
 4  
  * Licensed under the Apache License, Version 2.0 (the "License");
 5  
  * you may not use this file except in compliance with the License.
 6  
  * You may obtain a copy of the License at
 7  
  *
 8  
  *      http://www.apache.org/licenses/LICENSE-2.0
 9  
  *
 10  
  * Unless required by applicable law or agreed to in writing, software
 11  
  * distributed under the License is distributed on an "AS IS" BASIS,
 12  
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 13  
  * See the License for the specific language governing permissions and
 14  
  * limitations under the License.
 15  
  */
 16  
 
 17  
 package org.apache.commons.jelly.tags.bean;
 18  
 
 19  
 import java.lang.reflect.Method;
 20  
 import java.util.HashMap;
 21  
 import java.util.Map;
 22  
 
 23  
 import org.apache.commons.beanutils.MethodUtils;
 24  
 import org.apache.commons.jelly.JellyTagException;
 25  
 import org.apache.commons.jelly.MissingAttributeException;
 26  
 import org.apache.commons.jelly.TagSupport;
 27  
 import org.apache.commons.jelly.XMLOutput;
 28  
 import org.apache.commons.jelly.util.ClassLoaderUtils;
 29  
 import org.apache.commons.logging.Log;
 30  
 import org.apache.commons.logging.LogFactory;
 31  
 
 32  
 
 33  
 /**
 34  
  * Binds a Java bean to the given named Jelly tag so that the attributes of
 35  
  * the tag set the bean properties..
 36  
  *
 37  
  * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
 38  
  * @version $Revision: 1.8 $
 39  
  */
 40  1
 public class BeandefTag extends TagSupport {
 41  
 
 42  
     /** The Log to which logging calls will be made. */
 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 */
 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 */
 51  
     private String name;
 52  
 
 53  
     /** the Java class name to use for the tag */
 54  
     private String className;
 55  
 
 56  
     /** the name of the invoke method */
 57  
     private String methodName;
 58  
 
 59  
     /** the ClassLoader used to load beans */
 60  
     private ClassLoader classLoader;
 61  
 
 62  
     /** the library in which to define this new bean tag */
 63  
     private BeanTagLibrary library;
 64  
 
 65  2
     public BeandefTag(BeanTagLibrary library) {
 66  2
         this.library = library;
 67  2
     }
 68  
 
 69  
     // Tag interface
 70  
     //-------------------------------------------------------------------------
 71  
     public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException {
 72  2
         invokeBody(output);
 73  
 
 74  2
         if (name == null) {
 75  0
             throw new MissingAttributeException("name");
 76  
         }
 77  2
         if (className == null) {
 78  0
             throw new MissingAttributeException("className");
 79  
         }
 80  
 
 81  2
         Class theClass = null;
 82  
         try {
 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
 88  
                     + " using ClassLoader: "
 89  
                     + classLoader);
 90  
         }
 91  
 
 92  2
         Method invokeMethod = getInvokeMethod(theClass);
 93  
 
 94  
         // @todo should we allow the variable name to be specified?
 95  2
         library.registerBean(name, theClass, invokeMethod);
 96  2
     }
 97  
 
 98  
 
 99  
     // Properties
 100  
     //-------------------------------------------------------------------------
 101  
 
 102  
     /**
 103  
      * Sets the name of the tag to create
 104  
      */
 105  
     public void setName(String name) {
 106  2
         this.name = name;
 107  2
     }
 108  
 
 109  
     /**
 110  
      * Sets the Java class name to use for the tag
 111  
      */
 112  
     public void setClassName(String className) {
 113  2
         this.className = className;
 114  2
     }
 115  
 
 116  
     /**
 117  
      * Sets the ClassLoader to use to load the class.
 118  
      * If no value is set then the current threads context class
 119  
      * loader is used.
 120  
      */
 121  
     public void setClassLoader(ClassLoader classLoader) {
 122  0
         this.classLoader = classLoader;
 123  0
     }
 124  
 
 125  
     /**
 126  
      * @return the ClassLoader to use to load classes
 127  
      *  or will use the thread context loader if none is specified.
 128  
      */
 129  
     public ClassLoader getClassLoader() {
 130  0
         return ClassLoaderUtils.getClassLoader(classLoader, true, getClass());
 131  
     }
 132  
 
 133  
     /**
 134  
      * @return String
 135  
      */
 136  
     public String getMethodName() {
 137  0
         return methodName;
 138  
     }
 139  
 
 140  
     /**
 141  
      * Sets the methodName.
 142  
      * @param methodName The methodName to set
 143  
      */
 144  
     public void setMethodName(String methodName) {
 145  1
         this.methodName = methodName;
 146  1
     }
 147  
 
 148  
     // Implementation methods
 149  
     //-------------------------------------------------------------------------
 150  
     protected Method getInvokeMethod(Class theClass) {
 151  2
         if (methodName != null) {
 152  
             // lets lookup the method name
 153  1
             return MethodUtils.getAccessibleMethod(theClass, methodName, EMPTY_ARGUMENT_TYPES);
 154  
         }
 155  1
         return null;
 156  
     }
 157  
 }

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