Ruby-UDBM 0.7

The Ruby DBM library has now a binding to the popular Ruby language. The binding offers several modules as different layers on top of the DBM library, depending on what the user wants to do. The different modules are:
- udbm: This is the core binding that provides the classes Constraint to define constraints <=c or
- udbm-callback: This is a light wrapper that uses Ruby magic to callback a user defined function whenever a modifying method (of the form name!) is called. Its a change listener facility.
- udbm-gtk: This is a graphical viewer binding to gtk. Youll obviously need ruby-gtk to have this work. Main commands are UDBM::Fed.show(name), UDBM::Fed.hide, and UDBM::hide(name) to show and hide federations under a named tab in the viewer. If the federation instance changes, its view is updated on-the-fly. The viewer is a particular listener attached to a federation instance. If you want it to work properly, be careful with your references, e.g, a.show(me) followed by a = something new will stop further updates like a.up!. This module is using udbm-mdi, a nifty graphical component found on Ruby site. We only renamed it and modified it slightly. You dont have to worry about this module at all.
- udbm-sys: This offers a highler level view of federations as systems of constraints. This needs documentation, I know, but it is written in Ruby and it is therefor easy to read. It offers the possibility to manipulate sets (of clock valuations) as constraints between clocks that you define within contexts. Say you have a = Context.create(a,:x,:y,:z), this gives you access to the clocks x, y, and z. Now you can use sets defined like (a.x < a.y) & (a.y > 3) or (a.x > 4) | (a.y > 5), compute intersections, relations, unions, whatever you can do on federations, but with sets instead. It is another view of federations.
Enhancements:
- The graphical viewer can now display points together with federations.
- This release has been rebuilt against the DBM library version 2.0.5.