| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.commons.jelly.tags.bean; |
| |
| import java.lang.reflect.Method; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.commons.beanutils.MethodUtils; |
| import org.apache.commons.jelly.JellyTagException; |
| import org.apache.commons.jelly.MissingAttributeException; |
| import org.apache.commons.jelly.TagSupport; |
| import org.apache.commons.jelly.XMLOutput; |
| import org.apache.commons.jelly.util.ClassLoaderUtils; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| |
| /** |
| * Binds a Java bean to the given named Jelly tag so that the attributes of |
| * the tag set the bean properties.. |
| * |
| * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
| * @version $Revision$ |
| */ |
| public class BeandefTag extends TagSupport { |
| |
| /** The Log to which logging calls will be made. */ |
| private static final Log log = LogFactory.getLog(BeandefTag.class); |
| |
| /** An empty Map as I think Collections.EMPTY_MAP is only JDK 1.3 onwards */ |
| private static final Map EMPTY_MAP = new HashMap(); |
| |
| protected static final Class[] EMPTY_ARGUMENT_TYPES = {}; |
| |
| /** the name of the tag to create */ |
| private String name; |
| |
| /** the Java class name to use for the tag */ |
| private String className; |
| |
| /** the name of the invoke method */ |
| private String methodName; |
| |
| /** the ClassLoader used to load beans */ |
| private ClassLoader classLoader; |
| |
| /** the library in which to define this new bean tag */ |
| private BeanTagLibrary library; |
| |
| public BeandefTag(BeanTagLibrary library) { |
| this.library = library; |
| } |
| |
| // Tag interface |
| //------------------------------------------------------------------------- |
| public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException { |
| invokeBody(output); |
| |
| if (name == null) { |
| throw new MissingAttributeException("name"); |
| } |
| if (className == null) { |
| throw new MissingAttributeException("className"); |
| } |
| |
| Class theClass = null; |
| try { |
| theClass = ClassLoaderUtils.loadClass(className, classLoader, getContext().getUseContextClassLoader(), getClass()); |
| } catch (ClassNotFoundException e) { |
| log.error( "Could not load class: " + className + " exception: " + e, e ); |
| throw new JellyTagException("Could not find class: " |
| + className |
| + " using ClassLoader: " |
| + classLoader); |
| } |
| |
| Method invokeMethod = getInvokeMethod(theClass); |
| |
| // @todo should we allow the variable name to be specified? |
| library.registerBean(name, theClass, invokeMethod); |
| } |
| |
| |
| // Properties |
| //------------------------------------------------------------------------- |
| |
| /** |
| * Sets the name of the tag to create |
| */ |
| public void setName(String name) { |
| this.name = name; |
| } |
| |
| /** |
| * Sets the Java class name to use for the tag |
| */ |
| public void setClassName(String className) { |
| this.className = className; |
| } |
| |
| /** |
| * Sets the ClassLoader to use to load the class. |
| * If no value is set then the current threads context class |
| * loader is used. |
| */ |
| public void setClassLoader(ClassLoader classLoader) { |
| this.classLoader = classLoader; |
| } |
| |
| /** |
| * @return the ClassLoader to use to load classes |
| * or will use the thread context loader if none is specified. |
| */ |
| public ClassLoader getClassLoader() { |
| return ClassLoaderUtils.getClassLoader(classLoader, true, getClass()); |
| } |
| |
| /** |
| * @return String |
| */ |
| public String getMethodName() { |
| return methodName; |
| } |
| |
| /** |
| * Sets the methodName. |
| * @param methodName The methodName to set |
| */ |
| public void setMethodName(String methodName) { |
| this.methodName = methodName; |
| } |
| |
| // Implementation methods |
| //------------------------------------------------------------------------- |
| protected Method getInvokeMethod(Class theClass) { |
| if (methodName != null) { |
| // lets lookup the method name |
| return MethodUtils.getAccessibleMethod(theClass, methodName, EMPTY_ARGUMENT_TYPES); |
| } |
| return null; |
| } |
| } |