Design Patterns Explained

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Chapter 12 • Solving the CAD/CAM Problem with Patterns 213 Thinking in Patterns: Step 2d (Abstract Factory) All that is left is the Abstract Factory. As it turns out, this pattern is not needed. The rationale for using an Abstract Factory was to ensure all of the implementation objects were of type V1 if I had a V1 system or of type V2 if I had a V2 system. However, the Model object itself will know this. There is no point implementing a pattern if some other object can easily encapsulate the rules of creation. I left the Abstract Factory in the set of patterns because while I was first solving this problem I did think the Abstract Factory was present. It also illustrates how thinking that a pattern is present when it is not is not necessarily counterproductive. Thinking in Patterns: Step 3 The details of the design may still take some work. However, I would continue with the design by following Alexander's mandate of designing by context. For example, when I see how I need to implement a SlotFeature class or the V1Imp class, I should remember how the patterns involved are used. In this case, I note that in the Bridge pattern, the methods involving the abstractions are independent of implementation. This means that the Abstraction class (Feature) and all of its derivations (Slot-Feature, HoleFeature, and so forth) contain no implementation information. Implementation information is left to the Implementation classes. This means the Feature derivations will have methods such as getLocation and getLength, while the Implementations will contain a way to access this required information. A Vllmp object, for example, would need to know the ID of the Feature in the V1 system. Since each Feature has a unique ID, this means there will be one Implementation object for each Feature object. The methods in the Vllmp object will use this ID to ask the VlFacade for information about the object. Finally, do Abstract Factory Finishing the rest Assigning responsibilities
214 Part IV • Putting It All Together: Thinking in Patterns A comparable solution will exist for the V2 implementations. In this case, the V2Imp objects will contain a reference to the OOGFeature in question. Comparison with the Previous Solution Comparing solutions Compare this new solution, shown in Figure 12-11, with the earlier solution, which is shown again in Figure 12-12. A different way to compare solutions Figure 12 -12 This was the first solution. Another way to compare two solutions is to read them. In other words, the diagrams visually show inheritance (the is-a relationship) and composition (the has-a relationship). Read these diagrams using those words where the relationships are present.
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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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158 Part III Design Patterns Exampl
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Page 168 and 169: CHAPTER 10 The Abstract Factory Pat
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Page 188 and 189: CHAPTER 11 How Do Experts Design? O
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Page 198 and 199: Alexander's Steps Discussion Identi
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264 Part V • Handling Variations
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27O 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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