Design Patterns Explained

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Overview CHAPTER 1 The Object-Oriented Paradigm This chapter introduces you to the object-oriented paradigm by comparing and contrasting it with something familiar: standard structured programming. The object-oriented paradigm grew out of a need to meet the challenges of past practices using standard structured programming. By being clear about these challenges, we can better see the advantages of object-oriented programming, as well as gain a better understanding of this mechanism. This chapter will not make you an expert on object-oriented methods. It will not even introduce you to all of the basic object-oriented concepts. It will, however, prepare you for the rest of this book, which will explain the proper use of object-oriented design methods as practiced by the experts. In this chapter, • I discuss a common method of analysis, called functional decomposition. I address the problem of requirements and the need to deal with change (the scourge of programming!). I describe the object-oriented paradigm and show its use in action. In this chapter 3
4 Part I • An Introduction to Object-Oriented Software Development Functional decomposition is a natural way to deal with complexity I point out special object methods. I provide a table of important object terminology used in this chapter on page 21. Before The Object-Oriented Paradigm: Functional Decomposition Let’s start out by examining a common approach to software development. If I were to give you the task of writing code to access a description of shapes that were stored in a database and then display them, it would be natural to think in terms of the steps required. For example, you might think that you would solve the problem by doing the following: 1. Locate the list of shapes in the database. 2. Open up the list of shapes. 3. Sort the list according to some rules. 4. Display the individual shapes on the monitor. You could take any one of these steps and further break down the steps required to implement it. For example, you could break down Step 4 as follows: For each shape in the list, do the following: 4a. Identify type of shape. 4b. Get location of shape. 4c. Call appropriate function that will display shape, giving it the shape’s location. This is called functional decomposition because the analyst breaks down (decomposes) the problem into the functional steps that compose it. You and I do this because it is easier to deal with smaller pieces than it is to deal with the problem in its entirety. It is the same approach I might use to write a recipe for making lasagna,
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Page 3 and 4: xvi Preface From Object Orientation
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Page 54 and 55: PART II The Limitations of Traditio
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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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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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Design Patterns Explained

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