Concept Tree-Based Event Matching Algorithm in Publish/Subscribe Systems

Algorithm 5

Insert numeric constraint.

	insertGEMConstraint(attribute, constraint, id){
(1)	name = root(attribute);
(2)	gem = m4.get(name);
(3)	if gem is null{
(4)	gem = new GEMIndex( );
(5)	m4.put(name, gem);
(6)	}
(7)	compute index y, x by [lower, upper] of the constraint
(8)	gem.cell[y][x].set(id);
	}