/*
* Copyright 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.
*
* $Header:$
*/
package org.apache.beehive.netui.core.factory;
import org.apache.beehive.netui.util.internal.DiscoveryUtils;
import org.apache.beehive.netui.util.logging.Logger;
import org.apache.beehive.netui.util.config.bean.PageFlowFactoryConfig;
import org.apache.beehive.netui.util.config.bean.CustomPropertyConfig;
import javax.servlet.ServletContext;
/**
* Utility class for creating ServletContext-scoped factories.
*/
public class FactoryUtils
{
private static final Logger _log = Logger.getInstance( FactoryUtils.class );
public static Factory getFactory( ServletContext servletContext, PageFlowFactoryConfig factoryBean, Class factoryType )
{
if ( factoryBean == null ) return null;
String className = factoryBean.getFactoryClass();
ClassLoader cl = DiscoveryUtils.getClassLoader();
try
{
Class actualFactoryType = cl.loadClass( className );
if ( ! factoryType.isAssignableFrom( actualFactoryType ) )
{
_log.error( "Factory class " + actualFactoryType.getName() + " is not derived from "
+ factoryType.getName() );
return null;
}
CustomPropertyConfig[] props = factoryBean.getCustomProperties();
FactoryConfig config = new FactoryConfig();
if ( props != null )
{
for ( int i = 0; i < props.length; i++ )
{
CustomPropertyConfig prop = props[i];
config.addCustomProperty( prop.getName(), prop.getValue() );
}
}
return getFactory( servletContext, actualFactoryType, config );
}
catch ( ClassNotFoundException e )
{
_log.error( "Could not load factory class " + className, e );
}
return null;
}
public static Factory getFactory( ServletContext servletContext, Class factoryType, FactoryConfig config )
{
assert Factory.class.isAssignableFrom( factoryType ) : factoryType.getClass().getName();
try
{
Factory factory = ( Factory ) factoryType.newInstance();
factory.init( servletContext, config );
factory.onCreate();
return factory;
}
catch ( InstantiationException e )
{
_log.error( "Could not instantiate a factory of type " + factoryType.getName(), e );
}
catch ( IllegalAccessException e )
{
_log.error( "Could not access the default constructor for factory of type " + factoryType.getName(), e );
}
return null;
}
}