package javax.megaco.message.descriptor;



import java.io.Serializable;



/**

 * Signal Param type class defines all the static constants for the signal param

 * type for the megaco package.

 */

public class SignalParamType implements Serializable {



	/**

	 * Identifies signal param type to be list. Its value shall be set to 1.

	 */

	public static final int M_LIST = 1;



	/**

	 * Identifies signal param type to be request. Its value shall be set to 2.

	 */

	public static final int M_REQUEST = 2;



	/**

	 * Identifies a MegacoSignalParamType object that constructs the class with

	 * the constant M_LIST. Since it is reference to static final

	 * object, it prevents further instantiation of the same object in the

	 * system.

	 */

	public static final SignalParamType LIST = new SignalParamType(M_LIST);



	/**

	 * Identifies a MegacoSignalParamType object that constructs the class with

	 * the constant M_REQUEST. Since it is reference to static

	 * final object, it prevents further instantiation of the same object in the

	 * system.

	 */

	public static final SignalParamType REQUEST = new SignalParamType(M_REQUEST);



	private int signalParamType = -1;



	/**

	 * Constructs an class that specifies the signal param type in the signal

	 * descriptor.

	 * 

	 * @param signal_type

	 */

	private SignalParamType(int type) {

		this.signalParamType = type;

	}



	/**

	 * This method returns one of the static field constants defined in this

	 * class.

	 * 

	 * @return Returns an integer value that identifies the signal type to be

	 *         one of brief or on-off or other.

	 */

	public int getsignalParamType() {

		return this.signalParamType;

	}



	/**

	 * Returns reference of the SignalParamType object that identifies the

	 * signal type as value passed to this method.

	 * 

	 * @param value

	 *            - It is one of the possible values of the static constant that

	 *            this class provides.

	 * @return Returns reference of the signalParamType object.

	 * @throws IllegalArgumentException

	 *             - If the value passed to this method is invalid, then this

	 *             exception is raised.

	 */

	public static final SignalParamType getObject(int value) throws IllegalArgumentException {



		switch (value) {

		case M_LIST:

			return LIST;

		case M_REQUEST:

			return REQUEST;



		default:

			throw new IllegalArgumentException("Wrong signal param type passed: " + value);

		}



	}



	private Object readResolve() {

		return this.getObject(this.signalParamType);

	}



	@Override

	public String toString() {

		switch (this.signalParamType) {

		case M_LIST:

			return "SignalParamType[LIST]";

		case M_REQUEST:

			return "SignalParamType[REQUEST]";



		default:

			return "SignalParamType[" + this.signalParamType + "]";

		}

	}



}