Design Patterns Explained

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decompression object, 249 decorator objects chaining, 244, 250, 252 defined, 243 Decorator pattern, 243-254 and Analysis Matrix, 299 class diagram, 244 code examples, 246-247, 252-254 and e-tailing case study, 243, 244-248 and GoF classification system, 264 intent/purpose of, 243, 251 key features of, 251 power of, 250 simplified view of, 251 and stream I/O, 248-250 decoupling. See also coupling and Bridge pattern, 123, 133, 151 defined, 124 as pattern category, 264, 265 decryption object, 249 deleteOJbserver method, 272 dependency relationship, 35, 38, 266, 274 Dependents pattern, 267 Deployment Diagram, 30 derived class, 18, 19, 27, 34 design. See also software design Alexander's approach to, 181-195 complexification in, 189-190 and preformed parts, 188 as process of synthesis, 187, 194 rules for good, 192 design patterns. See also specific design patterns alternate ways of viewing/studying, 136-137, 217 and Analysis Matrix, 299 carpenter example, 81-84, 216 categories of, 263-265 and commonality/variability analysis, 307-309 composite, 152 compound, 152 and contextual design, 310 deriving, 138 Index 327 and encapsulation, 306-307 key features, 79 Abstract Factory pattern, 176 Adapter pattern, 102 Bridge pattern, 151 Decorator pattern, 251 Facade pattern, 90 Factory Method pattern, 288 Observer pattern, 273 Singleton pattern, 258 Strategy pattern, 238 Template Method pattern, 283 and object-oriented paradigm, 71, 85, 305-306 and open-closed principle, 218 origins of, 72-77 and principle of designing from context, 218-222 reasons for studying, 71, 80-86 recommended books on, 314— 316 seminal work on, 69, 78 solving CAD/CAM problem with, 197-216 subscribing to e-zine, 314 Website, 313-314 destructor, 25-26, 27 detach (Observer) method, 268 details, delaying commitment to, 64 device-driver, using switch to control, 164-171, 180 doQuery method, 281-282, 286 Double-Checked Locking pattern, 258-262 code examples, 261, 262 contrasted with Singleton pattern, 255, 261 intent/purpose of, 255 and multithreaded applications, 255, 258-259, 261 draw method, 144 draw_a_circle method, 126 draw_a_line method, 126 drawCircle method, 126, 129- 130, 144
328 Index drawing programs, 125-136, 141-149, 157-161 drawLine method, 126, 127, 130, 144 driver, using switch to control, 164-171, 180 E e-commerce system. See e-tailing case study e-tailing case study address verification, 265-266 and Analysis Matrix, 292-302 customer coupons, 269-271 database access, 279-282, 285-286 and design patterns Abstract Factory pattern, 299 Decorator pattern, 243, 244-248 Observer pattern, 267-272 Singleton pattern, 256-257 Strategy pattern, 239-240, 298 Template Method pattern, 280-282 international or der-processing, 292-302 printed sales ticket, 241-243, 244-248, 301 sales-order architecture, 232-234 tax rules, 234-237, 256-257 welcome letter, 265-266 e-zine, design patterns, 314 Eckel, Bruce, 178 electronic magazine, design patterns, 314 electronic-retailing. See e-tailing case study encapsulation advantages of, 24 and Bridge pattern, 156 defined, 20, 21, 27 and Facade pattern, 92, 93 and Observer pattern, 275 and Strategy pattern, 237, 239 tax-rules example, 234 traditional vs. new view of, 112-115, 140 types of, 114 errors. See bugs; debugging ESPRIT consortium, 77 expert system defined, 46 describing problem to be solved by, 48-51 extracting information for, 45-46, 49 understanding terminology, 46-48 explosion, class, 64, 65, 132, 134, 239-240 extensibility, software, 218 extreme Programming, recommended book on, 318 F Facade pattern, 87-93 and CAD/CAM problem, 92, 200, 210-211 contrasted with Adapter pattern, 104-106 determining relationship with other patterns, 203-205 intent/purpose of, 87, 89 key features of, 90 and principle of containing variation, 224 and principle of designing from context, 222 simplified view of, 90 ways of using, 91-92, 93 Factory Method pattern, 285-289 intent/purpose of, 287, 288 key features of, 288 simplified view of, 288 and Template Method, 286 ways of using, 287, 289 Factory objects, 169, 175, 250 features, expert system defined, 46-47 extracting from dataset, 49-50 generating NC set commands for, 50 FilelnputStream class, 250
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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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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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Page 312 and 313: CHAPTER 22 Bibliography This book h
Page 314 and 315: • Meyer, B., Object-Oriented Soft
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Page 318 and 319: Personal Favorites It is my belief
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Page 324 and 325: How do we get good quality repeated
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