CSC305 Lecture 15 - Speaker Deck

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Dr. Javier Gonzalez-Sanchez javiergs@calpoly.edu www.javiergs.info o ffi ce: 14 -227 CSC 305 Individual Software Design and Development Lecture 15. Connecting the Dots

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Previously …

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GoF Patterns 3

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From an Idea B 4 Main Factory Gift Ball Box Envelop Handler Supervisor Bin ShippingStrategy Land Air

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To A Software Design (UML Class Diagram) 5

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Structural Quality

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Instability • Indic a tes whether: ( a ) the item is m a inly used by others (st a ble – h a rd to ch a nge); or (b) it m a inly depends on other items (in-st a ble – ch a nge a ble). • It is a v a lue between 0 a nd 1: • 0 only incoming dependencies to • 1 (only outgoing dependencies). 7

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Distance 8 Abstract Concrete Stable Hard to Change Only incoming dependencies Unstable Changeable Only outgoing dependencies the m ain sequence Painful Useless 0 1 1 0 Instability Abstractness

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Connecting the Dots

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To Code 10

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Factory 11

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Chain of Responsibilities 12

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Decorator 13

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Decorator 14

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Observer 15

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Bin 17 In main: In ConcreteHandlerWithBox: In ConcreteHandlerWithEnvelop:

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One More Thing

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Idea 2 19 Main Factory Gift Ball Box Envelop Handler Supervisor Bin GUI

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Idea 2 20

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Idea 2 :: the GUI elements 21

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Idea 2 :: Listener 22

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Idea 2 23 Main Factory Gift Ball Box Envelop Handler Supervisor Bin GUI

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Questions 24

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Assignment

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Patterns in a Fantasy Quest 26

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CSC 305 Individual Software Design and Development Javier Gonzalez-Sanchez, Ph.D. javiergs@calpoly.edu Winter 2025 Copyright. These slides can only be used as study material for the class CSC305 at Cal Poly. They cannot be distributed or used for another purpose.