| EPSRC Reference: |
GR/M72630/01 |
| Title: |
OBJECTS, ASSOCIATIONS AND SUBSYSTEMS: A HIERARCHICAL APPROACH TO ENCAPSULATION |
| Principal Investigator: |
Bicarregui, Dr J |
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| Department: |
Computational Science & Engineering |
| Organisation: |
STFC Laboratories (Grouped) |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
06 March 2000 |
Ends: |
05 September 2003 |
Value (£): |
40,804
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| EPSRC Research Topic Classifications: |
| Fundamentals of Computing |
Software Engineering |
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Summary on Grant Application Form |
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Objects provide a simple yet powerful basis for modularity through encapsulation. Aggregation of attributes in objects, and objects in associations, provides a basis for data-encapsulation; object identifiers globally identify instances and give an implicit indirection which distinguishes attributes which are themselves objects from attributes which are pure values. Objects can also provide a basis for establishing non-interference in concurrent implementations.Although subtyping and inheritance provide a hierarchical means of classification of objects, the class-instance paradigm is essentially flat and does not directly support the nesting of objects within objects.It seems that the OO approach would benefit from an old idea: hierarchical structuring. In previous work, we observed that the compositional interpretation of object-orientated designs requires the identification of theories intermediate between those of the constituent classes and associations and that of the entire system; and , how many constructions are naturally interpreted in theories corresponding to identified parts of the overall system. This has led us to propose a notion of subsystem which generalises the class-instance-based concept of object, yielding an approach to system-specification employing object-like encapsulation in a nested hierarchy of components. We will investigate subsystems as first-class objects in OO system description achieving a hierarchy form of object-orientation
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Key Findings |
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Potential use in non-academic contexts |
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| Description |
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Sectors submitted by the Researcher |
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