Design Patterns Explained

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Chapter 1O • The Abstract Factory Pattern 167 While inheritance could work in this simple case, it has so many disadvantages that I would rather stay with the switches. For example: • Combinatorial explosion— For each different family and each new family I get in the future, I must create a new concrete class (that is, a new version of ApControl). • Unclear meaning— The resultant classes do not help clarify what is going on. I have specialized each class to a particular special case. If I want my code to be easy to maintain in the future, I need to strive to make it as clear as possible what is going on. Then, I do not have to spend a lot of time trying to relearn what that section of code is trying to do. • Need to favor composition— Finally, it violates the basic rule to "favor composition over inheritance." In my experience, I have found that switches often indicate an opportunity for abstraction. In this example, LRDD and HRDD are both display drivers and LRPD and HRPD are both print drivers. The abstractions would therefore be display drivers and print drivers. Figure 10-2 shows this conceptually. I say "conceptually" because LRDD and HRDD do not really derive from the same abstract class. Figure 1O-2 Drivers and their abstractions. .. . but this also has problems Alternative 3: replace switches with abstraction Note: At this point, I do not have to be concerned that they derive The code is simpler to from different classes because I know I can use the Adapter pattern understand to adapt the drivers, making it appear they belong to the appropriate abstract class.
168 Part III • <strong>Design</strong> <strong>Patterns</strong> Defining the objects this way would allow for ApControl to use a DisplayDriver and a PrintDriver without using switches. ApControl is much simpler to understand because it does not have to worry about the type of drivers it has. In other words, ApControl would use a DisplayDriver object or a PrintDriver object without having to worry about the driver's resolution. See Figure 10-3 and the code in Example 10-2. Figure 1O-3 ApControl using drivers in the ideal situation. Example 1O-2 Java Code Fragments: Using Polymorphism to Solve the Problem
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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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Figure 3-6 Class diagram of my solu
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Summary Chapter 3 • A Problem Tha
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58 Part II • The Limitations of T
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6O Part II • The Limitations of T
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Chapter 4 • A Standard Object-Ori
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Chapter 4 • A Standard Object-Ori
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Example 4-6 C++ Code Fragments: Imp
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Part Overview PART III Design Patte
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Overview CHAPTER 5 An Introduction
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Chapter 5 An Introduction to Design
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Table 5-2 Key Features of Patterns
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Figure 5-2 A miter joint Chapter 5
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Overview CHAPTER 6 The Facade Patte
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This person would determine how I a
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Field Notes: The Facade Pattern Fac
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Summary Chapter 6 • The Facade Pa
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96 Part III • Design Patterns Int
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98 Part III • Design Patterns How
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1OO Part III • Design Patterns /
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1O2 Part III • Design Patterns Th
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1O4 Part III • Design Patterns Co
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1O6 Part III • Design Patterns Ad
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CHAPTER 8 Expanding Our Horizons Ov
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1. Make a preliminary design withou
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Chapter 8 • Expanding Our Horizon
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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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