CS 47/147 Advanced Object-Oriented Programming - Caltech

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Elements of a Data Model• Diagram– Depicts sets and relations.• Text– Descriptions of sets and relations.– Constraints on relations.For example:• The names of all entries in a directory are distinct.• If the status of an order is “shipped”, then it has at least onetracking number.– Specifications of operations.10
Diagrams• There are lots of data modeling methods.• There are lots of diagram notations.• Book: simple ad hoc* notation based on Alloy(http://alloy.mit.edu).• Another famous notation: UML– Unified Modeling Language– Much more than just data modeling diagrams.– Big standard, many things to many people.– A bit more implementation-oriented than book’snotation.*As in, made up just for this book. I think.11
Page 2 and 3: CS 3Introduction to Software Engine
Page 4 and 5: Last Time: Requirements Analysis•
Page 6 and 7: From Requirements to Design• Soft
Page 8 and 9: The Object Motto“Ask not first wh
Page 12 and 13: Book Example: File System• Basic
Page 14 and 15: Book Example: File System• Files
Page 16 and 17: Book Example: File System• A dire
Page 18 and 19: Book Example: File System!FSObjectR
Page 21 and 22: Operations• As for a data abstrac

CS 47/147 Advanced Object-Oriented Programming - Caltech

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