public equals(other:IState): boolean {
		if (this.modeId !== other.getModeId()) {
			return false;
		}
		let otherStateData = other.getStateData();
		if (!this.stateData && !otherStateData) {
			return true;
		}
		if (this.stateData && otherStateData) {
			return this.stateData.equals(otherStateData);
		}
		return false;
	}

	public static safeEquals(a: IState, b: IState): boolean {
		if (a === null && b === null) {
			return true;
		}
		if (a === null || b === null) {
			return false;
		}
		return a.equals(b);
	}

	public equals(other: IState): boolean {
		if (other === null || this.modeId !== other.getModeId()) {
			return false;
		}
		if (other instanceof AbstractState) {
			return AbstractState.safeEquals(this.stateData, other.stateData);
		}
		return false;
	}

	public clone(): IState {
		let stateDataClone:IState = (this.stateData ? this.stateData.clone() : null);
		return new NullState(this.modeId, stateDataClone);
	}

	public static safeClone(state: IState): IState {
		if (state) {
			return state.clone();
		}
		return null;
	}