Design Patterns Explained

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296 Part V • Handling Variations with <strong>Design</strong> <strong>Patterns</strong> 4. Use the rows to identify rules A note about customers. My experience with customers has taught me several things: • They usually know their problem domain very well (most know it better than I ever will). • In general, they do not express things on the conceptual level, as developers often do. Instead, they talk in specific cases. • They often use the term always when they mean usually. • They often use the term never when they mean seldom. • They often say they have told me about all of the cases when in fact they have only told me what usually happens. The bottom line is that I trust customers to tell me what happens when I ask specific questions but I do not trust their generalized answers. I try to interact with them at a very concrete level. Even those customers who sound like they think in a conceptual way often do not, but are trying to "help me out." Now that the concepts are revealed, what should I do with what I know? How do I begin to move toward implementation? Look at the matrix in Table 20-6. The first row is labeled "Calculate freight," and includes "Use UPS rates," "Use Canadian shipper," and "Use German shipper." This row represents both • A general rule to implement "Calculate freight rate" • The specific set of rules that I must implement— that is, each shipper I may use in the different countries In fact, each row represents specific ways of implementing a generalized concept. Two of the rows (money and dates) may be handled at the object level. For example, money can be handled with objects
•nets-."' Chapter 2O • The Analysis Matrix 297 containing a currency object. Many computer languages support different date formats for different nationalities in their libraries. Table 20-7 shows the conceptual way of handling each row. Table 2O-7 Concrete Implementation Rules: Rows What do the columns represent? They are the specific implementations we will use for the case the column represents. This is illustrated in Table 20-8. Table 2O-8 Concrete Implementation Rules: Columns 5. Use the columns to identify implementation
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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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24O Part V • Handling Variations
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Page 280 and 281: Overview CHAPTER 18 The Template Me
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Page 288 and 289: The Factory Method Pattern Chapter
Page 290 and 291: Summary Chapter 19 • The Factory
Page 300 and 301: Figure 2O-1 Using Strategy patterns
Page 302 and 303: 3O2 Part V • Handling Variations
Page 304 and 305: CHAPTER 21 Design Patterns Reviewed
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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 322 and 323: Section Overview Section 3: Design
Page 324 and 325: How do we get good quality repeated
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Page 332 and 333: Patterns help us see the forest for
Page 334 and 335: Design Pattern Matrix Design Patter
Page 336 and 337: Design Pattern Matrix How it is imp
Page 344 and 345: 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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