Software Design Patterns for Effective Development
Explore the world of design patterns, elegant solutions to common software design problems, introduced in the book "Design Patterns: Elements of Reusable Object-Oriented Software" by the Gang of Four. Learn about the categories of design patterns, their benefits, and delve into specific patterns like the Memento Pattern and State Pattern with practical examples.
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Presentation Transcript
Design Patterns: introduction They are elegant solutions To well known problems in software design specify the way classes should be structured and should talk to one another were introduced in the book titled Design Patterns: Elements of Reusable Object-Oriented Software By the Gang of Four (GoF)
Design Patterns: categories Design patterns can be categorized as Creational concerned with how to create objects Structural deals with the relationship between classes Behavioral defines the way objects should interact with one another
Design Patterns: benefits Benefits They enable you to discuss projects at an abstract level They make it possible to Create reusable, maintainable and extensible code They make it easier to switch to new development frameworks
Memento Pattern: introduction It: is an example of a behavioral design pattern used to implement undo mechanisms To help restore an object to a previous state Case study: Equip an editor with an undo mechanism
Memento Pattern: solution Memento EditorState Originator content: String Editor content: String createState() restore(state) History states: List Caretaker push(state) pop()
State Pattern: introduction It: is an example of a behavioral design pattern allows an object to alter its behavior depending on its current state Case study: Enable a Canvas to support multiple tools
State Pattern: solution State Tool Context Canvas mouseDown() mouseUp() currentTool: Tool mouseDown() mouseUp() SelectionTool BrushTool Concrete StateB Concrete StateA mouseDown() mouseUp() mouseDown() mouseUp()
