/*
* 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.myfaces.orchestra.viewController;
import org.apache.myfaces.orchestra.lib.OrchestraException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* Invokes ViewController events using reflection.
* <p>
* If the target bean has a method with any of the following signatures then it
* receives the appropriate callback:
* <ul>
* <li>public void initView()</li>
* <li>public void preProcess()</li>
* <li>public void preRenderView()</li>
* </ul>
* <p>
* Note that each method here returns false if the target bean does not
* have a method with an appropriate signature; this allows this executor to
* be "chained" with others.
*/
public class ReflectiveViewControllerExecutor extends AbstractViewControllerExecutor
{
/**
* Helper method to find the method which should get invoked.
*/
protected boolean invokeOnViewController(Object bean, String methodName)
{
try
{
Method method = bean.getClass().getMethod(methodName, (Class[]) null); // NON-NLS
method.invoke(bean, (Object[]) null);
}
catch (NoSuchMethodException e)
{
return false;
}
catch (IllegalAccessException e)
{
throw new OrchestraException(e);
}
catch (InvocationTargetException e)
{
throw new OrchestraException(e);
}
return true;
}
/* the ViewControllerExecutor interface */
public boolean invokeInitView(String beanName, Object bean)
{
return invokeOnViewController(bean, "initView");
}
public boolean invokePreRenderView(String beanName, Object bean)
{
return invokeOnViewController(bean, "preRenderView");
}
public boolean invokePreProcess(String beanName, Object bean)
{
return invokeOnViewController(bean, "preProcess");
}
}