Design Patterns Explained

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Summary Chapter 3 • A Problem That Cries Out for Flexible Code 55 In this chapter, I described the CAD/CAM problem. • I must extract information from different CAD/CAM syste ms in the same way. This will allow a system in which the company has a great investment (an expert system) to continue working without expensive modifications every time the CAD/CAM sys tems changes. • I have two systems that are implemented in completely differ ent ways, even though they contain essentially the same infor mation. This task has many similarities to other problems I have run across in projects. There are different specific implementations of systems, but I want to allow other objects to communicate with these different implementations in the same way. In this chapter
CHAPTER 4 A Standard Object-Oriented Solution Overview This chapter gives an initial solution to the problem discussed in Chapter 3, "A Problem That Cries Out for Flexible Code." It is a reasonable first attempt at a solution and gets the job done quickly. However, it misses an important system requirement: flexibility as the CAD/CAM system continues to evolve. In this chapter, I describe a solution based on object orientation. It is not a great solution, but it is a solution that would work. Note: I will only show Java code examples in the main body of this chapter. The equivalent C++ code examples can be found at the end of this chapter. Solving with Special Cases Given the two different CAD/CAM systems described in Chapter 3, "A Problem That Cries Out for Flexible Code," how do I build an information-extraction system that will look the same to a client object regardless of which CAD/CAM system that I have? In thinking how to solve this problem, I reasoned that if I can solve it for slots, I can use that same solution for cutouts, holes, etc. In thinking about slots, I saw that I could easily specialize each case. That is, I'd have a Slot class and make a derivation for Slots when I had the V1 system and another derivation when I had a V2 sys tem. I show this in Figure 4-1. In this chapter Getting to a solution: special subclasses for each version 57
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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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Page 42 and 43: 3O Part I • An Introduction to Ob
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Page 54 and 55: PART II The Limitations of Traditio
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Page 78 and 79: Part Overview PART III Design Patte
Page 80 and 81: Overview CHAPTER 5 An Introduction
Page 82 and 83: Chapter 5 An Introduction to Design
Page 88 and 89: Table 5-2 Key Features of Patterns
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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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124 Part III • Design Patterns It
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126 Part III Design Patterns Proper
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128 Part III Design Patterns But, t
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130 Part III Design Patterns Unders
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132 Part III Design Patterns This s
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134 Part III Design Patterns An alt
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136 Part III Design Patterns It sti
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138 Part III Design Patterns Learni
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140 Part III Design Patterns Strate
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142 Part III Design Patterns Tying
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144 Part III Design Patterns One ru
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146 Part III Design Patterns From a
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148 Part III Design Patterns Exampl
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150 Part III Design Patterns The es
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152 Part III Design Patterns Compou
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154 Part III Design Patterns A usef
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156 Part III Design Patterns Concep
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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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