V. B. Nguyen, ``Impact of Adding
Customizibility On Software Architecture: A Case Study'', M.S.
Thesis, Technical Report CS97-532, Department of Computer Science and
Engineering, University of California, San Diego, March 1997.
A software product evolves due to changes in customer's requirements,
technology and just by generalization of the system over time.
Software readability and structures are degraded as enhancements
are made to the system, and maintenance becomes the most expensive
phase of software development. One way to lessen maintenance cost is to
restructure the system.
Bowdidge's star diagram is a visualization tool to assist in
meaning-preserving restructuring and understanding programs.
Chen extended the original star diagram tool to create a tool for planning a
restructuring to work with large C programs.
A major part of Chen's work was improving the viewability of
a star diagram. Chen improved the viewability by providing
two mechanisms to hide unwanted information: depth elision and star arm
trimming. Star arm trimming is also used as a planning mechanism.
In his tool both elision and trimming features are effective at
reducing the number
of nodes and the height of a star diagram approximately by half. His
work suggested that more elision methods would further enhance
a star diagram's viewability.
In this research, we wanted to add a customizable elision layer by
extending Chen's elision framework, and so we incorporated a narrow set of
property-based elisions. However, extending Chen's framework was difficult
and complicated. Therefore, we changed the elision metaphor, and reorganized
our system architecture in order to generalize the property-based elision
problem. Our research presents a simple, efficient, and extendable
elision layer, and exposes the flexibility of our existing