Software Engineering Refactoring Patterns: Lecture 12 Study Guide by Sharif University, Slides of Software Engineering

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Patterns in Software Engineering Lecturer: Raman Ramsin^ Lecture 12^ Refactoring Patterns

Part 3

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Sharif University of Technology

Part

Patterns in Software Engineering – Lecture 12 Dealing with Generalization:

Pull Up Constructor Body

Dealing

with Generalization:

Pull

Up Constructor Body

„^

Pull Up Constructor Body^ ^

You have constructors on subclasses with mostly identical bodies. Create a superclass constructor; call this from the subclass methods.

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Sharif University of Technology

Patterns in Software Engineering – Lecture 12 Dealing with Generalization:

Extract Interface

Dealing

with Generalization:

Extract

Interface

„^

Extract Interface^ ^

Several clients use the same subset of a class's interface, or two classes havepart of their interfaces in common. Extract the subset into an interface.

4

Sharif University of Technology

Patterns in Software Engineering – Lecture 12 Dealing with Generalization:

Collapse Hierarchy

Dealing

with Generalization:

Collapse

Hierarchy

„^

Collapse Hierarchy „^

Collapse

Hierarchy

^ A superclass and subclass are not very different. ^ Merge them together.

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Sharif University of Technology

Patterns in Software Engineering – Lecture 12 Dealing with Generalization:

Form Template Method

Dealing

with Generalization:

Form

Template Method

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Sharif University of Technology

Patterns in Software Engineering – Lecture 12 Dealing with Generalization:

Replace Inheritance with Delegation

g^

p^

g

„^

Replace Inheritance with Delegation p^

g

^ A subclass uses only part of a superclass’s interface or does not want to inheritdata. ^ Create a field for the superclass

adjust methods to delegate to the superclass

^ Create a field for the superclass, adjust methods to delegate to the superclass,and remove the subclassing.

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Sharif University of Technology

Patterns in Software Engineering – Lecture 12 Big Refactorings:

Tease Apart Inheritance

Big

Refactorings:

Tease

Apart Inheritance

„^

Tease Apart InheritanceTease

Apart Inheritance

^ You have an inheritance hierarchy that is doing two jobs at ^ You

have an inheritance hierarchy that is doing two jobs at

once.

Create two hierarchies and use delegation to invoke onefrom the other.

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Sharif University of Technology

Patterns in Software Engineering – Lecture 12 Big Refactorings:

Tease Apart Inheritance

Big

Refactorings:

Tease

Apart Inheritance 11

Sharif University of Technology

Patterns in Software Engineering – Lecture 12 Big Refactorings:

Convert Procedural Design to Objects

Big

Refactorings:

Convert

Procedural Design to Objects 13

Sharif University of Technology

Patterns in Software Engineering – Lecture 12 Big Refactorings:

Separate Domain from Presentation

Big

Refactorings:

Separate

Domain from Presentation

„^

Separate Domain from Presentation „^

Separate

Domain from Presentation

^ You have GUI classes that contain domain logic. ^ Separate the domain logic into separate domain classes.

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Sharif University of Technology

Patterns in Software Engineering – Lecture 12 Big Refactorings:

Extract Hierarchy

Big

Refactorings:

Extract

Hierarchy 16

Sharif University of Technology

Patterns in Software Engineering – Lecture 12 R fReference „ Fowler, M.,

Refactoring: Improving the Design of Existing Code,

Addison-Wesley, 1999.

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Sharif University of Technology