// $Id: ConfigurationFactory.java 13059 2007-07-11 00:28:01Z linus $
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package org.argouml.configuration;
import org.apache.log4j.Logger;
/**
* A factory object that provides configuration information.
*
* @author Thierry Lach
* @since 0.9.4
*/
public class ConfigurationFactory implements IConfigurationFactory {
/**
* The only occurance of the configuration factory.
*/
private static final IConfigurationFactory SINGLETON;
/**
* The active configuration handler.
*/
private static ConfigurationHandler handler =
new ConfigurationProperties();
/**
* Initialize the factory singleton based on system
* property argo.ConfigurationFactory, or use the default
* if not set.
*/
static {
String name = System.getProperty("argo.ConfigurationFactory");
IConfigurationFactory newFactory = null;
if (name != null) {
try {
newFactory =
(IConfigurationFactory) Class.forName(name).newInstance();
} catch (Exception e) {
Logger.getLogger(ConfigurationFactory.class).
warn("Can't create configuration factory "
+ name + ", using default factory");
}
}
if (newFactory == null) {
newFactory = new ConfigurationFactory();
}
SINGLETON = newFactory;
}
/**
* Private constructor to not allow instantiation.
*/
private ConfigurationFactory() {
}
/**
* Returns the instance of the singleton.
*
* @return the only instance of the configuration factory.
*/
public static final IConfigurationFactory getInstance() {
return SINGLETON;
}
/**
* Returns the customized configuration for the user.
*
* @return a concrete class which extends ConfigurationHandler and
* can be used to access and manipulate the configuration.
*/
public ConfigurationHandler getConfigurationHandler() {
// TODO: Allow other configuration handlers.
return handler;
}
} /* end class ConfigurationFactory */