Design Patterns Explained

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$MATLAB C++ Math Library Reference$

Intent Problem Solution Participants and Collaborators Consequences Implementation GoF Reference Chapter 18 • The Template Method Pattern 283 The Template Method Pattern: Key Features Define the skeleton of an algorithm in an operation, deferring some steps to subclasses. Redefine the steps in an algorithm without changing the algorithm's structure. There is a procedure or set of steps to follow that is consistent at one level of detail, but individual steps may have different implementations at a lower level of detail. Allows for definition of substeps that vary while maintaining a consistent basic process. The Template Method consists of an abstract class that defines the basic TemplateMethod (see figure below) classes that need to be overridden. Each concrete class derived from the abstract class implements a new method for the Template. Templates provide a good platform for code reuse. They also are helpful in ensuring the required steps are implemented. They bind the overridden steps together for each Concrete class, and so should only be used when these variations always and only occur together. Create an abstract class that implements a procedure using abstract methods. These abstract methods must be implemented in subclasses to perform each step of the procedure. If the steps vary independently, each step may be implemented with a Strategy pattern. Pages 325-330. Figure 18-2 Standard, simplified view of the Template Method pattern.
284 Part V • Handling Variations with <strong>Design</strong> <strong>Patterns</strong> Summary In this chapter Sometimes, I have a set of procedures that I must follow. The procedures are common at a high level, but implementing some of the steps can vary. For example, querying a SQL database is fairly routine at a high level, but some of the details— say, how to connect to the database— can vary based on details such as the platform. The Template Method allows me to define the sequence of steps and then override those steps that need to change.
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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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Page 280 and 281: Overview CHAPTER 18 The Template Me
Page 282 and 283: Chapter 18 • The Template Method
Page 286 and 287: CHAPTER 19 The Factory Method Patte
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
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Page 304 and 305: CHAPTER 21 Design Patterns Reviewed
Page 306 and 307: Chapter 21 • Design Patterns Revi
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Page 310 and 311: Figure 21-1 The relationships betwe
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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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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