Design Patterns Explained

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Figure 3-6 Class diagram of my solution. 1 Version 1 is essentially a collection of subroutine libraries. To get information from a model, a series of calls must be made. A typical set of queries would be the following: Step Do this in CAD/CAM Version 1 1. Open model XYZ and return a handle to it 2. Store this handle as H 3. For model, referred to by H, tell me how many features are present, store as N 4. For each feature in the model referred to by H (from 1 to N) 4a. for model referred to by H, tell me the ID of the ith element and store as ID 4b. for model referred to by H, tell me the feature type of ID and store as T Chapter 3 • A Problem That Cries Out for Flexible Code 53 4c. for model referred to by H, tell me the X coordinate of ID and store as X (use T to determine the proper routine to call, based on type) 1. This and all other class diagrams in this book use the Unified Modeling Language (UML) notation. See Chapter 2, "The UML— The Unified Modeling Language" for a description of UML notation.
54 Part II • The Limitations of Traditional Object-Oriented <strong>Design</strong> CAD/CAM V1 is dearly not object-oriented CAD/CAM V2 is object-oriented This system is painful to deal with and clearly not object-oriented. Whoever is using the system must maintain the context for every query manually. Each call about a feature must know what kind of feature it has. The CAD/CAM vendor realized the inherent limitations of this type of system. The primary motivation for building V2 was to make it object-oriented. The geometry in V2 is therefore stored in objects. When a system requests a model, it gets back an object which represents the model. This model object contains a set of objects, each representing a feature. Since the problem domain is based on features, it is not surprising that the classes V2 uses to represent these features correspond exactly to the ones I have mentioned already: slots, holes, cutouts, specials, and irregulars. Therefore, in V2, I can get a set of objects that correspond to the features that exist in the sheet metal. The UML diagram in Figure 3-7 shows the classes for the features. Figure 3-7 Feature classes of V2. The OOG stands for object-oriented geometry, just as a reminder that V2 is an object-oriented system.
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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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xxiv Preface Approach Rationale A N
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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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130 Part III Design Patterns Unders
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138 Part III Design Patterns Learni
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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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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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