@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;

		if (!PositionType.class.isAssignableFrom(obj.getClass()))
			return false;

		PositionType other = (PositionType) obj;
		return row == other.getRow() && col == other.getCol();
	}