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Refactoring to patterns - Joshua Kerievsky.pdf

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    Chapter 1. Why I Wrote This Book
    Over-Engineering
    The Patterns Panacea
    Under-Engineering
    Test-Driven Development and Continuous Refactoring
    Refactoring and Patterns
    Evolutionary Design
    Chapter 2. Refactoring
    What Is Refactoring?
    What Motivates Us to Refactor?
    Many Eyes
    Human-Readable Code
    Keeping It Clean
    Small Steps
    Design Debt
    Evolving a New Architecture
    Composite and Test-Driven Refactorings
    The Benefits of Composite Refactorings
    Refactoring Tools
    Chapter 3. Patterns
    What Is a Pattern?
    Patterns Happy
    There Are Many Ways to Implement a Pattern
    Refactoring to, towards, and away from Patterns
    Table 3.1.
    Do Patterns Make Code More Complex?
    Pattern Knowledge
    Up-Front Design with Patterns
    Chapter 4. Code Smells
    Table 4.1.
    Duplicated Code
    Long Method
    Conditional Complexity
    Primitive Obsession
    Indecent Exposure
    Solution Sprawl
    Alternative Classes with Different Interfaces
    Lazy Class
    Large Class
    Switch Statements
    Combinatorial Explosion
    Oddball Solution
    Chapter 5. A Catalog of Refactorings to Patterns
    Format of the Refactorings
    Benefits and Liabilities
    Projects Referenced in This Catalog
    XML Builders
    HTML Parser
    Loan Risk Calculator
    A Starting Point
    A Study Sequence
    Table 5.1.
    Chapter 6. Creation
    Replace Constructors with Creation Methods
    Motivation
    Creation Methods and Factory Methods
    Benefits and Liabilities
    Mechanics
    Example
    Variations
    Parameterized Creation Methods
    Extract Factory
    Move Creation Knowledge to Factory
    Motivation
    What Is a Factory?
    Benefits and Liabilities
    Mechanics
    Example
    Encapsulate Classes with Factory
    Motivation
    Benefits and Liabilities
    Mechanics
    Example
    Variations
    Encapsulating Inner Classes
    Introduce Polymorphic Creation with Factory Method
    Motivation
    Benefits and Liabilities
    Mechanics
    Example
    Encapsulate Composite with Builder
    Benefits and Liabilities
    Mechanics
    Example
    Improving a Builder
    Variations
    A Schema-Based Builder
    Inline Singleton
    Motivation
    Ward Cunningham on Singletons
    Kent Beck on Singletons
    Benefits and Liabilities
    Mechanics
    Example
    Chapter 7. Simplification
    Compose Method
    Motivation
    Benefits and Liabilities
    Mechanics
    Example
    Replace Conditional Logic with Strategy
    Motivation
    Benefits and Liabilities
    Mechanics
    Example
    Move Embellishment to Decorator
    Motivation
    Decorator versus Strategy
    Benefits and Liabilities
    Mechanics
    Example
    Replace State-Altering Conditionals with State
    Motivation
    Benefits and Liabilities
    Mechanics
    Example
    Replace Implicit Tree with Composite
    Motivation
    Benefits and Liabilities
    Mechanics
    Example
    Replace Conditional Dispatcher with Command
    Motivation
    Benefits and Liabilities
    Mechanics
    Example
    Chapter 8. Generalization
    Form Template Method
    Motivation
    Benefits and Liabilities
    Mechanics
    Example
    Extract Composite
    Motivation
    Benefits and Liabilities
    Mechanics
    Example
    Replace One/Many Distinctions with Composite
    Motivation
    Benefits and Liabilities
    Mechanics
    Example
    Replace Hard-Coded Notifications with Observer
    Motivation
    Benefits and Liabilities
    Mechanics
    Example
    Unify Interfaces with Adapter
    Motivation
    Benefits and Liabilities
    Mechanics
    Example
    Extract Adapter
    Motivation
    Adapter and Facade
    Benefits and Liabilities
    Mechanics
    Example
    Variations
    Adapting with Anonymous Inner Classes
    Replace Implicit Language with Interpreter
    Motivation
    Benefits and Liabilities
    Mechanics
    Example
    Chapter 9. Protection
    Replace Type Code with Class
    Motivation
    Benefits and Liabilities
    Mechanics
    Example
    Limit Instantiation with Singleton
    Motivation
    Benefits and Liabilities
    Mechanics
    Example
    Introduce Null Object
    Motivation
    Benefits and Liabilities
    Mechanics
    Example
    Background for the Example: Mouse Events in Java 1.0
    Chapter 10. Accumulation
    Move Accumulation to Collecting Parameter
    Motivation
    Benefits and Liabilities
    Mechanics
    Example
    Move Accumulation to Visitor
    Motivation
    Benefits and Liabilities
    Mechanics
    External Accumulation Method
    Internal Accumulation Method
    Visitor Replacement
    Example
    Chapter 11. Utilities
    Chain Constructors
    Motivation
    Mechanics
    Example
    Unify Interfaces
    Motivation
    Mechanics
    Example
    Extract Parameter
    Motivation
    Mechanics
    Example
    Afterword
    References
    Inside Front Cover
    List of Refactorings
    Refactoring Directions
    Inside Back Cover
    Code Smells
    A Study Sequence
    Chapter Menu What Is This Book About? What Are the Goals of This Book? Who Should Read This Book? What Background Do You Need? How to Use This Book The History of This Book Standing on the Shoulders of Giants Acknowledgments Chapter 1. Why I Wrote This Book Over-Engineering The Patterns Panacea Under-Engineering Test-Driven Development and Continuous Refactoring Refactoring and Patterns Evolutionary Design Chapter 2. Refactoring What Is Refactoring? What Motivates Us to Refactor? Many Eyes Human-Readable Code Keeping It Clean Small Steps Design Debt Evolving a New Architecture Composite and Test-Driven Refactorings The Benefits of Composite Refactorings Refactoring Tools Chapter 3. Patterns What Is a Pattern? Patterns Happy There Are Many Ways to Implement a Pattern Refactoring to, towards, and away from Patterns Table 3.1. Do Patterns Make Code More Complex? Pattern Knowledge Up-Front Design with Patterns Chapter 4. Code Smells Table 4.1.
    Duplicated Code Long Method Conditional Complexity Primitive Obsession Indecent Exposure Solution Sprawl Alternative Classes with Different Interfaces Lazy Class Large Class Switch Statements Combinatorial Explosion Oddball Solution Chapter 5. A Catalog of Refactorings to Patterns Format of the Refactorings Benefits and Liabilities Projects Referenced in This Catalog XML Builders HTML Parser Loan Risk Calculator A Starting Point A Study Sequence Table 5.1. Chapter 6. Creation Replace Constructors with Creation Methods Motivation Creation Methods and Factory Methods Benefits and Liabilities Mechanics Example Variations Parameterized Creation Methods Extract Factory Move Creation Knowledge to Factory Motivation What Is a Factory? Benefits and Liabilities Mechanics Example Encapsulate Classes with Factory Motivation Benefits and Liabilities Mechanics Example Variations Encapsulating Inner Classes
    Introduce Polymorphic Creation with Factory Method Motivation Benefits and Liabilities Mechanics Example Encapsulate Composite with Builder Benefits and Liabilities Mechanics Example Improving a Builder Variations A Schema-Based Builder Inline Singleton Motivation Ward Cunningham on Singletons Kent Beck on Singletons Benefits and Liabilities Mechanics Example Chapter 7. Simplification Compose Method Motivation Benefits and Liabilities Mechanics Example Replace Conditional Logic with Strategy Motivation Benefits and Liabilities Mechanics Example Move Embellishment to Decorator Motivation Decorator versus Strategy Benefits and Liabilities Mechanics Example Replace State-Altering Conditionals with State Motivation Benefits and Liabilities Mechanics Example Replace Implicit Tree with Composite Motivation Benefits and Liabilities Mechanics Example
    Replace Conditional Dispatcher with Command Motivation Benefits and Liabilities Mechanics Example Chapter 8. Generalization Form Template Method Motivation Benefits and Liabilities Mechanics Example Extract Composite Motivation Benefits and Liabilities Mechanics Example Replace One/Many Distinctions with Composite Motivation Benefits and Liabilities Mechanics Example Replace Hard-Coded Notifications with Observer Motivation Benefits and Liabilities Mechanics Example Unify Interfaces with Adapter Motivation Benefits and Liabilities Mechanics Example Extract Adapter Motivation Adapter and Facade Benefits and Liabilities Mechanics Example Variations Adapting with Anonymous Inner Classes Replace Implicit Language with Interpreter Motivation Benefits and Liabilities Mechanics Example Chapter 9. Protection
    Replace Type Code with Class Motivation Benefits and Liabilities Mechanics Example Limit Instantiation with Singleton Motivation Benefits and Liabilities Mechanics Example Introduce Null Object Motivation Benefits and Liabilities Mechanics Example Background for the Example: Mouse Events in Java 1.0 Chapter 10. Accumulation Move Accumulation to Collecting Parameter Motivation Benefits and Liabilities Mechanics Example Move Accumulation to Visitor Motivation Benefits and Liabilities Mechanics External Accumulation Method Internal Accumulation Method Visitor Replacement Example Chapter 11. Utilities Chain Constructors Motivation Mechanics Example Unify Interfaces Motivation Mechanics Example Extract Parameter Motivation Mechanics Example Afterword
    References Inside Front Cover List of Refactorings Refactoring Directions Inside Back Cover Code Smells A Study Sequence
    What Is This Book About? This book is about the marriage of refactoring—the process of improving the design of existing code—with patterns, the classic solutions to recurring design problems. Refactoring to Patterns suggests that using patterns to improve an existing design is better than using patterns early in a new design. This is true whether code is years old or minutes old. We improve designs with patterns by applying sequences of low-level design transformations, known as refactorings.
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