@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + (horizontal ? 1231 : 1237);
		result = prime * result + identifier;
		result = prime * result + length;
		result = prime * result
				+ ((position == null) ? 0 : position.hashCode());
		return result;
	}