| /* |
| * 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.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; |
| |
| /** |
| * A tag which calls a method in an object instantied by core:new |
| * |
| * |
| * @author Rodney Waldhoff |
| * @version $Revision: 1.10 $ |
| */ |
| public class InvokeTag extends TagSupport implements ArgTagParent { |
| |
| /** the variable exported */ |
| private String var; |
| |
| /** the variable where the method's exception is exported */ |
| private String exceptionVar; |
| |
| /** the method to invoke */ |
| private String methodName; |
| |
| /** the object to invoke the method on */ |
| private Object onInstance; |
| |
| private List paramTypes = new ArrayList(); |
| private List paramValues = new ArrayList(); |
| |
| public InvokeTag() { |
| } |
| |
| /** Sets the name of the variable exported by this tag */ |
| public void setVar(String var) { |
| this.var = var; |
| } |
| |
| /** Sets the name of a variable that exports the exception thrown by |
| * the method's invocation (if any) |
| */ |
| public void setExceptionVar(String var) { |
| this.exceptionVar = var; |
| } |
| |
| public void setMethod(String method) { |
| this.methodName = method; |
| } |
| |
| public void setOn(Object instance) { |
| this.onInstance = instance; |
| } |
| |
| public void addArgument(Class type, Object value) { |
| paramTypes.add(type); |
| paramValues.add(value); |
| } |
| |
| // Tag interface |
| //------------------------------------------------------------------------- |
| public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException { |
| if ( null == methodName) { |
| throw new MissingAttributeException( "method" ); |
| } |
| if ( null == onInstance ) { |
| throw new MissingAttributeException( "on" ); |
| } |
| |
| invokeBody(output); |
| |
| Object[] values = paramValues.toArray(); |
| Class[] types = (Class[])(paramTypes.toArray(new Class[paramTypes.size()])); |
| |
| Object result = null; |
| try { |
| result = MethodUtils.invokeMethod(onInstance,methodName,values,types); |
| } |
| catch (NoSuchMethodException e) { |
| throw new JellyTagException(e); |
| } |
| catch (IllegalAccessException e) { |
| throw new JellyTagException(e); |
| } |
| catch (InvocationTargetException e) { |
| if(null != exceptionVar) { |
| context.setVariable(exceptionVar,e.getTargetException()); |
| } else { |
| throw new JellyTagException("method " + methodName + |
| " threw exception: "+ e.getTargetException().getMessage(), |
| e.getTargetException() ); |
| } |
| } |
| finally { |
| paramTypes.clear(); |
| paramValues.clear(); |
| } |
| |
| ArgTag parentArg = (ArgTag)(findAncestorWithClass(ArgTag.class)); |
| if(null != parentArg) { |
| parentArg.setValue(result); |
| } |
| if(null != var) { |
| context.setVariable(var, result); |
| } |
| } |
| } |