Design Patterns Explained

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usiness rules defining, 238 encapsulating, 237, 239 ByteArraylnputStream class, 250 c c ++ and Bridge pattern, 150, 152 code examples drawing circles/rectangles, 157-161 implementing CAD/CAM V1 methods, 67 implementing CAD/CAM V2 methods, 68 implementing ResFactory, 181 instantiating CAD/CAM V1 features, 66 instantiating CAD/CAM V2 features, 67-68 using Adapter pattern, 107 using Bridge pattern, 157-161 using Decorator pattern, 252-254 using Double-Checked Locking pattern, 262 using Observer pattern, 276-277 using polymorphism to solve problem, 180 using Singleton pattern, 262 using switch to control device driver, 180 recommended book on, 317 and Singleton pattern, 259 CAD/CAM problem and Abstract Factory pattern, 179, 213 and Adapter pattern, 106, 200, 212 and Bridge pattern, 125, 200, 206-210 description of, 45, 48-55, 197-198 and Facade pattern, 92, 200, 210-211 solutions design-pattern approach, 212 object-oriented approach, 57-68, 214 Index 325 CAD/CAM system extracting information from, 45-46, 49 maintenance considerations, 64, 65 supporting multiple versions of, 51-54, 57-68 terminology, 46-48 CalcTax class/object, 234-237, 256 canonical form, 208 cardinality, 36-37 carpenter example, design patterns, 81-84, 216 Case Diagram, 30 case study. See e-tailing case study chain, object, 244, 250, 252 Chain of Responsibility pattern, 299 change anticipating and dealing with, 7-14, 23, 229-232 unintended consequences of, 5, 9 Circle class, 128, 129 circles, drawing, 129-130, 157-161 clarity, 8 Class Adapter pattern, 103 Class Diagram, 31-38 adding note to, 36 purpose of, 30, 31 showin g cardinality with, 36-38 showing class information with, 32-33 showing relationship between classes with, 34-35 static nature of, 38 class explosion, 64, 65, 132, 134, 239-240 classes abstract vs. concrete, 18 containing variation in, 223-225 controlling accessibility of data/ methods, 33 defined, 17,21,27 organizing objects around, 16-17 reusing, 114 showing information about, 32-33 showing relationships between, 34-35 Goad, Peter, 150 COBOL, recommended book on, 317
326 Index code anticipating changes in, 5, 6-7 debugging, 9, 10, 212 introducing bugs into, 5 modifiability of, 85 organizing around objects vs. functions, 14 problem requiring flexible, 45, 57 refactoring, 154 code examples. See C++; Java cohesion, 8, 63, 236 collection, 18, 32 colon (:), connecting object and class with, 40 combinatorial explosion, 167. See also class explosion Command pattern, 299 commonality/variability analysis, 119, 138-139, 199, 219, 307-309 communication, improving team, 80, 84, 86 companion Web site (for this book), 313-314 complexification, design, 189-190 Composite pattern, 152, 299 composition contrasted with aggregation, 35-36 example of, 32 favoring over inheritance, 233, 235 compound design pattern, 152 computer-aided design and manufacturing. See CAD/CAM conceptual perspective, 13-14, 15, 110, 119 concrete class, 18 Concrete class, 283 ConcreteComponent class, 251 ConcreteFactory class, 176 Concrete Implement or class, 151 ConcreteProduct class, 288 ConcreteStrategy class, 238 CONNECT command, 279 consequences, design pattern, 79 constructor, 25, 26, 27 contained objects, 117-119 containing variation, principle of, 223-225 containment, 32, 35 context looking for what creates, 200-204 principle of designing from, 218-222 "context first" rule, 192, 202 context-setting patterns, 203 contextual design, 310, 312 Coplien, Jim and Analysis Matrix, 291, 302 and commonality/variability analysis, 138-139 and new perspective on design patterns, 110 coupling, 8-9, 63, 117. See also decoupling coupons, e-tailing case study, 269-271 Courtyard pattern, 175-176, 191 creational patterns, 264 Creator class, 288 cultural anthropology, origin of design patterns in, 72 Customer class, 265-266 customers, understanding, 296. See also user requirements CVA, 199. See also commonality/variability analysis D daemon rules, 267 dashed line, showing dependency with, 38 data-hiding, 1, 20, 112, 113, 140 database instantiating, 285-286 querying, 279-282 dataset, CAD/CAM, 48 debugging, 9, 10, 212 decision tables, 291 decomposition, functional and code changes, 5, 7-10 defined, 4-5, 26, 27 example of, 4 problems with, 5, 8, 10
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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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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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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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The Factory Method Pattern Chapter
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Summary Chapter 19 • The Factory
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