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

		if (obj instanceof OrFilter) {
			OrFilter filter = (OrFilter) obj;
			if ((left.equals(filter.left)  && right.equals(filter.right)) ||
					(left.equals(filter.right) && right.equals(filter.left))) {
				return true;
			}
		}
		return false;
	}