The document introduces the Ptidej Tool Suite for reverse engineering, identifying design patterns and defects in object-oriented programs. It provides an example of the Composite design pattern and describes spaghetti code as an example of a design defect. The tool suite was developed by the Ptidej Team at the University of Montreal to help evaluate and enhance the quality of OO programs through the use of design patterns.

1. The Ptidej Tool Suite
Yann-Gaël Guéhéneuc
guehene@iro.umontreal.ca
Naouel Moha
mohanaou@iro.umontreal.ca
A demonstration of the reverse-engineering, design pattern and defect
identification features of the tool suite developed by the Ptidej Team
GEODES Ptidej Team – OO Programs Quality Evaluation and Enhancement using Patterns
Group of Open, Distributed Systems, Experimental Software Engineering
Department of Informatics and Operations Research
University of Montreal
© Guéhéneuc and Moha 2007

2. Example of a Design Pattern
 Composite
Motif [GoF 94]

3. Process for Identification of Design
Patterns

4. Example of a Design Defect
Spaghetti Code [Brown 98]
 “Ad hoc software structure
makes it difficult to extend and
optimize code”

– Procedural thinking in OO
programming
– Lack of structure : no
inheritance, no reuse, no
polymorphism
– Classes with procedural names
– Long methods process oriented
with no parameters and low
cohesion
– Use of class and global variables
for processing

5. Process for Identification of Design
Defects

6. Thanks for your Attention…
Yann-Gaël Guéhéneuc
guehene@iro.umontreal.ca
Naouel Moha
mohanaou@iro.umontreal.ca
http://www.ptidej.net