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/*
* 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.webapp;
import jakarta.faces.FacesException;
import jakarta.servlet.ServletContext;
import org.apache.myfaces.config.MyfacesConfig;
import org.apache.myfaces.util.lang.ClassUtils;
/**
* Simple Factory to get a FacesInitializer implementation either from a web.xml
* parameter or from a list of default implementations.
*
* @author Jakob Korherr (latest modification by $Author$)
* @version $Revision$ $Date$
*/
public class FacesInitializerFactory
{
/**
* Gets the FacesInitializer for the system.
* @param context
* @return
*/
public static FacesInitializer getFacesInitializer(ServletContext context)
{
FacesInitializer initializer = getFacesInitializerFromInitParam(context);
if (initializer == null)
{
initializer = new FacesInitializerImpl();
}
return initializer;
}
/**
* Gets a FacesInitializer from the web.xml config param.
* @param context
* @return
*/
private static FacesInitializer getFacesInitializerFromInitParam(ServletContext context)
{
String initializerClassName = context.getInitParameter(MyfacesConfig.FACES_INITIALIZER);
if (initializerClassName != null)
{
try
{
// get Class object
Class<?> clazz = ClassUtils.classForName(initializerClassName);
if (!FacesInitializer.class.isAssignableFrom(clazz))
{
throw new FacesException("Class " + clazz
+ " does not implement FacesInitializer");
}
// create instance and return it
return (FacesInitializer) ClassUtils.newInstance(clazz);
}
catch (ClassNotFoundException cnfe)
{
throw new FacesException("Could not find class of specified FacesInitializer", cnfe);
}
}
return null;
}
}