design patterns FOR B.tech (jntu - hyderabad & kakinada) (IV/I - CSE AND IV/II - IT) CONTENTS 1.1 INTRODUCTION TO DESIGN PATTERNS TTERNS... TTERN?...

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1 Contents i design patterns FOR B.tech (jntu - hyderabad & kakinada) (IV/I - CSE AND IV/II - IT) CONTENTS UNIT - I [CH. H. - 1] ] [INTRODUCTION TO ] INTRODUCTION TO WHAT T IS A DESIGN PATTERN? TTERN? Advantages of Design Patterns Essential Elements of a Design Pattern IN SMALLTALK ALK MVC DESCRIBING TTERNS THE CATAL ALOG OF ORGANIZING THE CATAL ALOG OG Creational Patterns atterns Structural Patterns Behavioral Patterns Various Ways ays of Organizing the Design Patterns atterns HOW SOLVE VE DESIGN PROBLEMS Finding Appropriate Objects Determining the Granularity of Objects Specifying Object Interfaces Specifying Object Implementations Class Vs Interface Inheritance Principle of Reusable Object-Oriented Design

2 ii Contents Using Reuse Mechanisms Inheritance Vs Composition Difference Between White-Box Reuse and Black-Box Reuse Inheritance Vs Parametrized Types Relating Runun-Time and Compile-Time ime Structures Aggregation Vs Acquaintance Designing for Change Tool Kits its Frameworks HOW TO O SELECT A DESIGN PATTERN TTERN HOW TO O USE A DESIGN PATTERN UNIT - II [CH. - 2] ] [A CASE STUDY - DESIGNING A DOCUMENT EDITOR] DESIGN PROBLEMS DOCUMENT STRUCTURE Recursive Composition Glyphs FORMATTING Encapsulating the Formatting Algorithm Compositor and Composition EMBELLISHING THE USER INTERFACE CE SUPPORTING MULTIPLE LOOK-AND AND-FEEL STAND ANDARDS ARDS SUPPORTING MULTIPLE WINDOW SYSTEMS Window and WindowImp Configuring Windows with WindowImps Bridge Pattern

3 Contents iii 2.7 USER OPERATIONS TIONS Encapsulating a Request Command Class and Subclasses Undoability Command History SPELLING CHECKING AND HYPHENATION Accessing Scattered Information Encapsulating Access and Traversal Iterator Class and Subclasses Traversal Vs Traversal Actions Encapsulating the Analysis Visitor Class and Subclasses SUMMARY UNIT - III [CH. - 3] ] [CREATIONAL PATTERNS] INTRODUCTION TO O CREATIONAL PATTERNS ABSTRACT CT FACT CTOR ORY Y PATTERN BUILDER PATTERN TTERN FACT CTOR ORY Y METHOD PATTERN TTERN PROTOTYPE TYPE PATTERN SINGLETON PATTERN DISCUSSION OF CREATIONAL PATTERNS TTERNS UNIT - IV [CH. - 4] ] [STRUCTURAL PATTERN PART - I] INTRODUCTION TO STRUCTURAL PATTERNS ADAPTER APTER PATTERN BRIDGE PATTERN COMPOSITE PATTERN

4 iv Contents UNIT - V [CH. H. - 5] ] [STRUCTURAL PATTERN PART - II] DECORATOR PATTERN Benefits of Decorator Pattern attern Liabilities of Decorator Pattern attern FACADE PATTERN FLYWEIGHT PATTERN TTERN PROXY PATTERN COMPARISION BETWEEN DIFFERENT GROUPS OF STRUCTURAL PATTERNS Adapter Vs Bridge Composite Vs Decorator Decorator Vs Proxy UNIT - VI [CH. - 6] ] [BEHAVIORAL PATTERNS PART - I] INTRODUCTION TO O BEHAVIORAL PATTERNS CHAIN OF RESPONSIBILITY Designing Software for Security Systems Using Chain of Responsibility Pattern COMMAND PATTERN TTERN Designing Software for a Server in Election Commission Using Command Pattern attern INTERPRETER PATTERN ITERATOR PATTERN UNIT - VII [CH. - 7] ] [BEHAVIORAL PATTERNS PART - II] MEDIATOR PATTERN MEMENTO PATTERN OBSERVER PATTERN TTERN

5 Contents v UNIT - VII [CH. H. - 8] ] [BEHAVIORAL PATTERNS PART - II (CONT D)] STATE TE PATTERN State Design Pattern for Web Based Mail Server STRATEG TEGY PATTERN TEMPLATE METHOD PATTERN VISITOR PATTERN TTERN DISCUSSION OF BEHAVIORAL PATTERNS Encapsulating Variation Objects as Arguments Should Communication be Encapsulated or Distributed Decoupling Senders and Receivers Observer Behavioral Pattern Vs Mediator Behavioral Pattern UNIT - VIII [CH. - 9] ] [CONCLUSION CONCLUSION] WHAT T TO O EXPECT FROM? TTERNS? A Common Design Vocabulary A Documentation and Learning Aid An Adjunct to Existing Methods A Target for Refactoring efactoring A BRIEF HISTOR ORY THE PATTERN COMMUNITY Alexander s Pattern Languages anguages Patterns in Software AN INVITATION TION A PAR ARTING THOUGHT

6 vi Contents STUDENT NOTES