/*
* 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.wicket.protocol.http;
import org.apache.wicket.WicketRuntimeException;
/**
* Factory that creates application objects based on the class name specified in the
* {@link ContextParamWebApplicationFactory#APP_CLASS_PARAM} context variable.
*
* @author Igor Vaynberg (ivaynberg)
*/
public class ContextParamWebApplicationFactory implements IWebApplicationFactory
{
/**
* context parameter name that must contain the class name of the application
*/
public static final String APP_CLASS_PARAM = "applicationClassName";
/* @see IWebApplicationFactory#createApplication(WicketFilter) */
@Override
public WebApplication createApplication(WicketFilter filter)
{
final String applicationClassName = filter.getFilterConfig().getInitParameter(
APP_CLASS_PARAM);
if (applicationClassName == null)
{
throw new WicketRuntimeException(
"servlet init param [" +
APP_CLASS_PARAM +
"] is missing. If you are trying to use your own implementation of IWebApplicationFactory and get this message then the servlet init param [" +
WicketFilter.APP_FACT_PARAM + "] is missing");
}
return createApplication(applicationClassName);
}
/**
* Instantiates the application instance.
*
* @param applicationClassName
* the classname of the application to create
* @return the web application
*/
protected WebApplication createApplication(final String applicationClassName)
{
try
{
ClassLoader loader = Thread.currentThread().getContextClassLoader();
if (loader == null)
{
loader = getClass().getClassLoader();
}
// see http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6500212
// final Class<?> applicationClass = loader.loadClass(applicationClassName);
final Class<?> applicationClass = Class.forName(applicationClassName, false, loader);
if (WebApplication.class.isAssignableFrom(applicationClass))
{
// Construct WebApplication subclass
return (WebApplication)applicationClass.newInstance();
}
else
{
throw new WicketRuntimeException("Application class " + applicationClassName +
" must be a subclass of WebApplication");
}
}
catch (ClassNotFoundException e)
{
throw new WicketRuntimeException("Unable to create application of class " +
applicationClassName, e);
}
catch (InstantiationException e)
{
throw new WicketRuntimeException("Unable to create application of class " +
applicationClassName, e);
}
catch (IllegalAccessException e)
{
throw new WicketRuntimeException("Unable to create application of class " +
applicationClassName, e);
}
catch (SecurityException e)
{
throw new WicketRuntimeException("Unable to create application of class " +
applicationClassName, e);
}
}
/** {@inheritDoc} */
@Override
public void destroy(WicketFilter filter)
{
}
}