Design Patterns Explained

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1O6 Part III • <strong>Design</strong> <strong>Patterns</strong> Adapter lets me communicate with OOGFeature Bottom line: A Facade simplifies an interface while an Adapter converts the interface into a preexisting interface. Relating the Adapter Pattern to the CAD/CAM Problem In the CAD/CAM problem (Chapter 3, "A Problem That Cries Out for Flexible Code"), the features in the V2 model will be represented by OOGFeature objects. Unfortunately, these objects do not have the correct interface (from my perspective) because I did not design them. I cannot make them derive from the Feature classes, yet, when I use the V2 system, they would do our job perfectly. In this case, the option of writing new classes to implement this function is not even present— I must communicate with the OOGFeature objects. The easiest way to do this is with the Adapter pattern. Summary In this chapter The Adapter pattern is a very useful pattern that converts the interface of a class (or classes) into another interface, which we need the class to have. It is implemented by creating a new class with the desired interface and then wrapping the original class methods to effectively contain the adapted object.
Supplement: C++ Code Example Example 7-2 C++ Code Fragments: Implementing the Adapter Pattern class Circle : public Shape { private: XXCircle *pxc; } Circle::Circle () { pxc= new XXCircle; } void Circle::display () { pxc->displayIt(); } Chapter 7 • The Adapter Pattern 1O7
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xvi Preface From Object Orientation
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xviii Preface Patterns are supposed
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xx Preface A slight digression. The
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xxii Preface abstractly and because
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xxiv Preface Approach Rationale A N
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xxvi Preface Acknowledgments Almost
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Overview CHAPTER 1 The Object-Orien
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Chapter 1 The Object-Oriented Parad
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Table 1-2 Objects and Their Respons
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The main program would now look lik
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Table 1-4 Object-Oriented Terminolo
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3O Part I • An Introduction to Ob
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32 Part I • An Introduction to Ob
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4O Part I • An Introduction to Ob
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PART II The Limitations of Traditio
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CHAPTER 3 A Problem That Cries Out
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Chapter 3 • A Problem That Cries
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158 Part III Design Patterns Exampl
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160 Part III Design Patterns Exampl
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CHAPTER 10 The Abstract Factory Pat
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Chapter 1O • The Abstract Factory
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Figure 1O-5 The ResFactory encapsul
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Figure 1O-6 Intermediate solution u
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In this pattern, Chapter 1O • The
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CHAPTER 11 How Do Experts Design? O
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Design is often thought of as a pro
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Design is often thought of as a pro
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It is only possible to make a place
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that it shared its patterns with ot
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Alexander's Steps Discussion Identi
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Chapter 11 • How Do Experts Desig
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198 Part IV • Putting It All Toge
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2OO Part IV • Putting It All Toge
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2O2 Part IV • Putting It All Toge
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2O4 Part IV • Putting It AM Toget
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Chapter 12 • Solving the CAD/CAM
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CHAPTER 13 The Principles and Strat
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Chapter 13 • The Principles and S
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228 Part V • Handling Variations
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23O Part V • Handling Variations
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Overview CHAPTER 18 The Template Me
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Chapter 18 • The Template Method
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Intent Problem Solution Participant
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CHAPTER 19 The Factory Method Patte
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The Factory Method Pattern Chapter
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Summary Chapter 19 • The Factory
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Figure 2O-1 Using Strategy patterns
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3O2 Part V • Handling Variations
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CHAPTER 21 Design Patterns Reviewed
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Chapter 21 • Design Patterns Revi
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Chapter 21 • Design Patterns Revi
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Figure 21-1 The relationships betwe
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CHAPTER 22 Bibliography This book h
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• Meyer, B., Object-Oriented Soft
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• See http://java.sun.com/j2se/L3
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Personal Favorites It is my belief
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Spradely, J. P., The Ethnographic I
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Section Overview Section 3: Design
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How do we get good quality repeated
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Or again, people are creatures of h
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this book is not a book about writi
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…The details can confuse the solu
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Patterns help us see the forest for
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Design Pattern Matrix Design Patter
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Design Pattern Matrix How it is imp
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Design Pattern Matrix Is there vari
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: (colon), connecting object and cl
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usiness rules defining, 238 encapsu
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decompression object, 249 decorator
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FilterlnputStream class, 250 flexib
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notifyObservers method, 272 NULL te
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sales-order architecture, e-tail sy
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Design Patterns Explained

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