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package org.glassfish.installer.conf;

/**
 *
 * @author sathyan
 * Singleton Factory for creating instance objects, currently supports two
 * types "Standalone" and "Clustered".
 */
public class InstanceFactory {

    private static StandAloneInstance stInstance = null;
    private static ClusteredInstance clInstance = null;

    protected InstanceFactory() {
    }

    /* @param instanceType, one of these values "standalone" or "clustered".
     * @return an Instance of either StandAloneInstance() or ClusteredInstance()
     * depending on the type of instance the users wanted to configure/create.
     */
    static public Instance getInstance(String instanceType) {
        if (instanceType.equalsIgnoreCase("standalone")) {
            if (stInstance == null) {
                stInstance = new StandAloneInstance();
            }
            return stInstance;
        }
        if (instanceType.equalsIgnoreCase("clustered")) {
            if (clInstance == null) {
                clInstance = new ClusteredInstance();
            }
            return clInstance;
        }
        return null;
    }
}