Design Patterns Explained

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Chapter 11 • How Do Experts <strong>Design</strong>? 195 1. Start out with a conceptual understanding of the whole in order to understand what needs to be accomplished. 2. Identify the patterns that are present in the whole. 3. Start with those patterns that create the context for the others. 4. Apply these patterns. 5. Repeat with the remaining patterns, as well as with any new patterns that were discovered along the way. 6. Finally, refine the design and implement within the context created by applying these patterns one at a time. As a software developer, you may not be able to apply Alexander's pattern language approach directly. However, designing by adding concepts within the context of previously presented concepts is surely something that all of us can do. Keep this in mind as you learn new patterns later in this book. Many patterns create robust software because they define contexts within which the classes that implement them can work.
CHAPTER 12 Solving the CAD/CAM Problem with <strong>Patterns</strong> Overview In this chapter, I apply design patterns to solve the CAD/CAM prob- In this chapter lem presented in Chapter 3, "A Problem That Cries Out for Flexible Code." In this chapter, • I walk through the methods needed to solve the earlier CAD/ CAM problem. • I take you through the initial design phase. The details of implementation are left to you. • I compare the new solution with the previous solution. Review of the CAD/CAM Problem In Chapter 3, I described the requirements for the CAD/CAM problem, a real-world problem that first got me on the road to using design patterns. The problem domain is in computer systems to support a large engineering organization, specifically, to support their CAD/CAM system. The basic requirement is to create a computer program that can read a CAD/CAM dataset and extract the features that an existing expert system needs to be able to do intelligent design. This system is supposed to shield the expert system from the CAD/CAM system. The complication is that the CAD/CAM system was in the midst of The requirements 197
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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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Overview CHAPTER 1 The Object-Orien
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Chapter 1 The Object-Oriented Parad
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The main program would now look lik
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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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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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CHAPTER 8 Expanding Our Horizons Ov
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1. Make a preliminary design withou
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130 Part III Design Patterns Unders
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134 Part III Design Patterns An alt
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138 Part III Design Patterns Learni
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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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