Design patterns Elements of Reusable Object Oriented Software

Design patterns Elements of Reusable Object Oriented Software

Design patterns Elements of Reusable Object Oriented Software

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1 Introduction ...................................................... 11 

1.1 What Is a Design Pattern? ...................................... 12 

1.2 Design Patterns in Smalltalk MVC ............................... 14 

1.3 Describing Design Patterns ..................................... 16 

1.4 The Catalog of Design Patterns ................................. 18 

1.5 Organizing the Catalog ......................................... 21 

1.6 How Design Patterns Solve Design Problems ...................... 23 

1.7 How to Select a Design Pattern ................................. 42 

1.8 How to Use a Design Pattern .................................... 44 

2 A Case Study: Designing a Document Editor ......................... 46 

2.1 Design Problems ................................................ 46 

2.2 Document Structure ............................................. 47 

2.3 Formatting ..................................................... 53 

2.4 Embellishing the User Interface ................................ 56 

2.5 Supporting Multiple Look-and-Feel Standards .................... 60 

2.6 Supporting Multiple Window Systems ............................. 64 

2.7 User Operations ................................................ 72 

2.8 Spelling Checking and Hyphenation .............................. 77 

2.9 Summary ........................................................ 90 

Design Pattern Catalog .............................................. 93 

3 Creational Patterns ............................................... 94 

Abstract Factory ................................................... 99 

Builder ........................................................... 110 

Factory Method .................................................... 121 

Prototype ......................................................... 133 

Singleton ......................................................... 144 

Discussion of Creational Patterns .................................. 153 

 esign Patterns: Elements of Reusable Object-Oriented Software 

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4 Structural Patterns .............................................. 155 

Adapter ........................................................... 157 

Bridge ............................................................ 171 

Composite ......................................................... 183 

Decorator ......................................................... 196 

Façade ............................................................ 208 

Flyweight ......................................................... 218 

Proxy ............................................................. 233 

Discussion of Structural Patterns ................................. 246 

5 Behavioral Patterns .............................................. 249 

Chain of Responsibility ........................................... 251 

Command ........................................................... 263 

Interpreter ....................................................... 274 

Iterator .......................................................... 289 

Mediator .......................................................... 305 

Memento ........................................................... 316 

Observer .......................................................... 326 

State ............................................................. 338 

Strategy .......................................................... 349 

Template Method ................................................... 360 

Visitor ........................................................... 366 

Discussion of Behavioral Patterns ................................. 382 

6 Conclusion ....................................................... 388 

6.1 What to Expect from Design Patterns ........................... 388 

6.2 A Brief History ............................................... 392 

6.3 The Pattern Community ......................................... 393 

6.4 An Invitation ................................................. 395 

6.5 A Parting Thought ............................................. 396 

A Glossary ......................................................... 397 

B Guide to Notation ................................................ 404 

B.1 Class Diagram ................................................. 404 

B.2 Object Diagram ................................................ 406 

B.3 Interaction Diagram ........................................... 407 

C Foundation Classes ............................................... 409 

C.1 List .......................................................... 409 

C.2 Iterator ...................................................... 412 

C.3 ListIterator .................................................. 413 esign Patterns: Elements of Reusable Object-Oriented Software 

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C.4 Point ......................................................... 413 

C.5 Rect .......................................................... 414 

Bibliography ....................................................... 416