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| Foreword | |
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| Foreword | |
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| Preface | |
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| What Is This Book About? | |
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| What Are the Goals of This Book? | |
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| Who Should Read This Book? | |
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| What Background Do You Need? | |
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| How to Use This Book | |
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| The History of This Book | |
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| Standing on the Shoulders of Giants | |
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| Acknowledgments | |
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| Why I Wrote This Book | |
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| Over-Engineering | |
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| The Patterns Panacea | |
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| Under-Engineering | |
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| Test-Driven Development and Continuous Refactoring | |
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| Refactoring and Patterns | |
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| Evolutionary Design | |
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| Refactoring | |
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| What Is Refactoring? | |
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| What Motivates Us to Refactor? | |
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| Many Eyes | |
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| Human-Readable Code | |
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| Keeping It Clean | |
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| Small Steps | |
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| Design Debt | |
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| Evolving a New Architecture | |
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| Composite and Test-Driven Refactorings | |
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| The Benefits of Composite Refactorings | |
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| Refactoring Tools | |
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| Patterns | |
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| What Is a Pattern? | |
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| Patterns Happy | |
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| There Are Many Ways to Implement a Pattern | |
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| Refactoring to, towards, and away from Patterns | |
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| Do Patterns Make Code More Complex? | |
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| Pattern Knowledge | |
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| Up-Front Design with Patterns | |
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| Code Smells | |
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| Duplicated Code | |
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| Long Method | |
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| Conditional Complexity | |
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| Primitive Obsession | |
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| Indecent Exposure | |
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| Solution Sprawl | |
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| Alternative Classes with Different Interfaces | |
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| Lazy Class | |
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| Large Class | |
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| Switch Statements | |
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| Combinatorial Explosion | |
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| Oddball Solution | |
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| A Catalog of Refactorings to Patterns | |
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| Format of the Refactorings | |
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| Projects Referenced in This Catalog | |
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| XML Builders | |
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| HTML Parser | |
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| Loan Risk Calculator | |
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| A Starting Point | |
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| A Study Sequence | |
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| Creation | |
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| Replace Constructors with Creation Methods | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Variations | |
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| Move Creation Knowledge to Factory | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Encapsulate Classes with Factory | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Variations | |
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| Introduce Polymorphic Creation with Factory Method | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Encapsulate Composite with Builder | |
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| Mechanics | |
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| Example | |
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| Variations | |
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| Inline Singleton | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Simplification | |
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| Compose Method | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Replace Conditional Logic with Strategy | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Move Embellishment to Decorator | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Replace State-Altering Conditionals with State | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Replace Implicit Tree with Composite | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Replace Conditional Dispatcher with Command | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Generalization | |
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| Form Template Method | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Extract Composite | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Replace One/Many Distinctions with Composite | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Replace Hard-Coded Notifications with Observer | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Unify Interfaces with Adapter | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Extract Adapter | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Variations | |
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| Replace Implicit Language with Interpreter | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Protection | |
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| Replace Type Code with Class | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Limit Instantiation with Singleton | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Introduce Null Object | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Accumulation | |
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| Move Accumulation to Collecting Parameter | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Move Accumulation to Visitor | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Utilities | |
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| Chain Constructors | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Unify Interfaces | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Extract Parameter | |
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| Motivation | |
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| Mechanics | |
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| Example | |
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| Afterword | |
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| References | |
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| Index | |