Design Patterns Explained

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Chapter 5 An Introduction to Design Patterns 81 Consider two carpenters discussing how to build the drawers for some cabinets. Carpenter 1: How do you think we should build these drawers? Carpenter 2: Well, I think we should make the joint by cutting straight down into the wood, and then cut back up 45 degrees, and then going straight back down, and then back up the other way 45 degrees, and then going straight back down, and then . . . Now, your job is to figure out what they are talking about! Isn’t that a confusing description? What is Carpenter 2 prescribing? The details certainly get in the way! Let’s try to draw out his description. Carpenter 2 Says . . . Which Looks Like . . . “Well, I think we should make the joint by cutting straight down into the wood, and then cut back up 45 degrees . . .” “. . . then going straight back down, and then back up the other way 45 degrees, and then going straight back down, and then . . .” “. . . until you end up with a dovetail joint. That is what I was describing!” Example of the tyranny of details: carpenters making a set of drawers The details may confuse the solution
82 Part III Design Patterns This sounds like so many code reviews: details, details, details Carpenters do not really talk at that level of detail Doesn’t this sound like code reviews you have heard? The one where the programmer describes the code in terms such as, And then, I use a WHILE LOOP here to do . . . followed by a series of IF statements to do . . . and here I use a SWITCH to handle . . . You get a description of the details of the code, but you have no idea what the program is doing and why it is doing it! Of course, no self-respecting carpenter would talk like this. What would really happen is something like: Carpenter 1: Should we use a dovetail joint or a miter joint? Already we see a qualitative difference. The carpenters are discussing differences in the quality of solutions to a problem; their discussion is at a higher level, a more abstract level. They avoid getting bogged down in the details of a particular solution. When the carpenter speaks of a miter joint, he or she has the following characteristics of the solution in mind: It is a simpler solution—A miter joint is a simple joint to make. You cut the edges of the joining pieces at 45 degrees, abut them, and then nail or glue them together (see Figure 5-2). It is lightweight—A miter joint is weaker than a dovetail. It cannot hold together under great stress. It is inconspicuous—The miter joint’s single cut is much less noticeable than the dovetail joint’s multiple cuts.
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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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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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