/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.kernel.plugins.config;
import org.jboss.kernel.spi.config.KernelConfig;
import org.jboss.kernel.plugins.config.property.PropertyKernelConfig;
import java.util.Properties;
/**
* Implementation of the Factory design pattern used in constructing new
* instances of {@link KernelConfig KernelConfig} objects based on various
* configuration sources.
*
* @author <a href="mailto:les.hazlewood@jboss.org">Les A. Hazlewood</a>
* @version <tt>$Revision: 1.3 $</tt>
*/
public class KernelConfigFactory {
/**
* Constructs a new KernelConfig instance based on the System properties.
* <p>If any necessary KernelConfig properties are not found in the System
* properties, sensible default implementations for the missing
* properties will be used.
* @return a new <tt>KernelConfig</tt> instance based on the
* System properties.
* @see System#getProperties()
* @see #newInstance(Properties)
*/
public static KernelConfig newInstance() {
//for the values not found in the System properties, default values
//used are from the KernelConstants interface. See
//the PropertyKernelConfig class implementation for more details.
return newInstance( System.getProperties() );
}
/**
* Constructs a new <tt>KernelConfig</tt> instance based on the specified
* <tt>Properties</tt>.
* <p>If any necessary KernelConfig properties are not found in the given
* properties, sensible default implementations for the missing
* properties will be used.
* @param props the properties to use when creating a new
* <tt>KernelConfig</tt> instance.
* @return a new <tt>KernelConfig</tt> instance based on the specified
* <tt>Properties</tt>
* @see PropertyKernelConfig
*/
public static KernelConfig newInstance( Properties props ) {
KernelConfig cfg = null;
try
{
//for the values not found in the given props, default values
//used are from the KernelConstants interface. See
//the PropertyKernelConfig class implementation for more details.
cfg = new PropertyKernelConfig( props );
}
catch ( Throwable t )
{
String msg = "Unable to construct a " +
PropertyKernelConfig.class.getName() +
" instance based on the specified properties.";
throw new RuntimeException( msg, t );
}
return cfg;
}
}