Ptidej-v5.2-master/POM Tests/data/ArgoUML_0.28/src/org/argouml/configuration/ConfigurationFactory.java
// $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 */
