| /* |
| * Copyright 2002,2004 The Apache Software Foundation. |
| * |
| * Licensed 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.core; |
| |
| import java.lang.reflect.InvocationTargetException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.commons.beanutils.ConstructorUtils; |
| import org.apache.commons.jelly.JellyTagException; |
| import org.apache.commons.jelly.MissingAttributeException; |
| import org.apache.commons.jelly.XMLOutput; |
| |
| /** A tag which creates a new object of the given type |
| * |
| * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
| * @version $Revision:$ |
| */ |
| public class NewTag extends BaseClassLoaderTag implements ArgTagParent { |
| |
| /** the variable exported */ |
| private String var; |
| |
| /** the class name of the object to instantiate */ |
| private String className; |
| |
| private List paramTypes = new ArrayList(); |
| private List paramValues = new ArrayList(); |
| |
| public NewTag() { |
| } |
| |
| /** Sets the name of the variable exported by this tag */ |
| public void setVar(String var) { |
| this.var = var; |
| } |
| |
| /** Sets the class name of the object to instantiate */ |
| public void setClassName(String className) { |
| this.className = className; |
| } |
| |
| public void addArgument(Class type, Object value) { |
| paramTypes.add(type); |
| paramValues.add(value); |
| } |
| |
| // Tag interface |
| //------------------------------------------------------------------------- |
| public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException { |
| ArgTag parentArg = null; |
| if ( var == null ) { |
| parentArg = (ArgTag)(findAncestorWithClass(ArgTag.class)); |
| if(null == parentArg) { |
| throw new MissingAttributeException( "var" ); |
| } |
| } |
| if ( className == null ) { |
| throw new MissingAttributeException( "className" ); |
| } |
| invokeBody(output); |
| |
| try { |
| Class theClass = getClassLoader().loadClass( className ); |
| Object object = null; |
| if(paramTypes.size() == 0) { |
| object = theClass.newInstance(); |
| } else { |
| Object[] values = paramValues.toArray(); |
| Class[] types = (Class[])(paramTypes.toArray(new Class[paramTypes.size()])); |
| object = ConstructorUtils.invokeConstructor(theClass,values,types); |
| paramTypes.clear(); |
| paramValues.clear(); |
| } |
| if(null != var) { |
| context.setVariable(var, object); |
| } else { |
| parentArg.setValue(object); |
| } |
| } |
| catch (ClassNotFoundException e) { |
| throw new JellyTagException(e); |
| } |
| catch (InstantiationException e) { |
| throw new JellyTagException(e); |
| } |
| catch (NoSuchMethodException e) { |
| throw new JellyTagException(e); |
| } |
| catch (IllegalAccessException e) { |
| throw new JellyTagException(e); |
| } |
| catch (InvocationTargetException e) { |
| throw new JellyTagException(e); |
| } |
| } |
| } |