Design Patterns Explained

FilterlnputStream class, 250
flexible code, problem requiring, 45, 57
forces, design pattern, 79
Fowler, Martin, 13, 154
Fowler's perspectives, 13-14, 15-16, 21
frameworks, defining, 287
functional decomposition
and code changes, 5, 7-10
defined, 4-5, 26, 27
example of, 4
problems with, 5, 8, 10
functions
changing, 9
organizing code around objects instead
of, 14
G
Gamma, Erich. See Gang of Four
Gang of Four
and aggregation vs. composition, 32
authors included in, 69 and designing
for change, 231 and encapsulation, 115,
140 and new perspective on design
patterns, 110 and pattern
classification system,
263-265
seminal work on design patterns, 69, 78
and specific design patterns Abstract
Factory pattern, 163 Adapter pattern, 96
Bridge pattern, 123 Decorator pattern,
243 Facade pattern, 87 Factory Method
pattern, 287 Observer pattern, 265, 266
Singleton pattern, 256 Strategy pattern,
237 Template Method pattern, 280 and
strategies for creating good designs,
85 garbage collection,
25-26, 152
Index 329
Gardner, Karen, 77
generalized classes, 114
geometry
CAD/CAM, 48
object-oriented, 54 getEdgeType
method, 212 get Length method, 213
getLocation method, 213 GoF
reference, 79 gut instinct, paying
attention to, 65
H
has-a relationship, 31, 34-35, 214
Helm, Richard. See Gang of Four
hiding data, 1, 20, 112, 113, 140
hierarchies
avoiding large, 85, 223
creating parallel, 287
I
implementation, decoupling abstraction
from, 123-124, 133, 145-146
implementation perspective, 13-14, 16,
110-111, 119
Implementor class, 151
inheritance
alternate way of using, 114— 115
avoiding large hierarchies, 85, 223
defined, 21, 27
favoring object composition over, 233,
235
and is-a relationships, 18
overusing, 65, 133-134
input/output, stream, 248-250
InputStream class, 250 instance,
17, 21, 27 instantiation
and abstract classes, 19
and Bridge pattern, 152
defined, 17, 27
and Factory Method pattern, 287, 288