/**
 *  Protocol port factory (Singleton)
 *  
 *  @author     ETSI / STF424
 *  @version    $URL$
 *              $Id$
 *
 */
package org.etsi.its.adapter.ports;

import java.lang.reflect.Constructor;
import java.util.Map;
import java.util.TreeMap;

/**
 *  Protocol port factory (Singleton)
 */
public class ProtocolPortFactory {

	/**
	 * Unique instance of the factory
	 */
	private static ProtocolPortFactory instance = new ProtocolPortFactory();
		
	/**
	 * List of the registered protocol port types 
	 */
	protected Map<String, Class<? extends ProtocolPort>> ports = new TreeMap<String, Class<? extends ProtocolPort>>();
	
	/**
	 * Private constructor (Singleton pattern)
	 */
	private ProtocolPortFactory() {
		// Register the ports - Refer to TTCN-3 component LibIts_TestSystem.ItsSystem for ports name
		ports.put("camPort", CamPort.class);
		ports.put("denmPort", DenmPort.class);
		ports.put("btpPort", BtpPort.class);
		ports.put("geoNetworkingPort", GnPort.class);
		ports.put("ipv6OverGeoNetworkingPort", Gn6Port.class);
		ports.put("v2gPort", V2GPort.class);
	}

	/**
	 * Gets the unique factory instance
	 * @return ProtocolPortFactory instance
	 */
	public static ProtocolPortFactory getInstance(){
		return instance;
	}

	/**
	 * Creates a port of the desired type
	 * @param  portName            Name of the port
	 * @param  componentName       Name of the component owning the port instance
	 * @param  lowerStackDesc      Description of the lower protocol stack of the port in the form "Layer/Layer/Layer/..."   
	 * @param  linkLayerAddress    Link-layer address to be used by this port as source address (null if not applicable)
	 * @return Protocol port instance
	 */
	public ProtocolPort createPort(String portName, String componentName, String lowerStackDesc, String linkLayerAddress) {
		ProtocolPort port = null;
		Class<?>[] ctorParams = {portName.getClass(), componentName.getClass(), lowerStackDesc.getClass(), linkLayerAddress.getClass()};
		
		try {
            Class<? extends ProtocolPort> cls = ports.get(portName);

            if (cls == null) {
                throw new RuntimeException("No class registered under " + portName);
            }

            Constructor<? extends ProtocolPort> ctor = cls.getConstructor(ctorParams);
            port = ctor.newInstance(portName, componentName, lowerStackDesc, linkLayerAddress);
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        return port;
	}
}