adapter - WordPress.com

adapter
25 Mayıs 13 Cumartesi
25 Mayıs 13 Cumartesi
Problem:
How to solve incompatible interfaces, or
provide a stable interface to similar
components with different interfaces?
 Solution:
Convert the original interface of a
component into another interface, through
an intermediate adapter object.

25 Mayıs 13 Cumartesi
t(
es
qu
re
)
target interface
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()
t
es
u
eq
R
ed
t
la
s
n
a
r
t
adaptee interface
Client
«interface»
Target
request()
Adapter
request()
25 Mayıs 13 Cumartesi
Adaptee
specificRequest()
class adapter
Client
Target
Adaptee
request()
specificRequest()
Adapter
request()
25 Mayıs 13 Cumartesi
example
25 Mayıs 13 Cumartesi
25 Mayıs 13 Cumartesi
Amplifier
Tuner
on()
off()
setAm()
setFm()
setFrequenct()
on()
off()
setCd()
setDvd()
…
CdPlayer
Screen
on()
down()
PopCornPopper
on()
off()
pop()
25 Mayıs 13 Cumartesi
on()
off()
eject()
pause()
…
TheatherLights
on()
off()
dim()
DvdPlayer
on()
off()
eject()
pause()
…
Projector
on()
off()
tvMode()
wideScreen()
…
HomeTheatherFacade
watchMovie()
endMovie()
listenToCd()
…
Amplifier
Tuner
on()
off()
setAm()
setFm()
setFrequenct()
on()
off()
setCd()
setDvd()
…
CdPlayer
Screen
on()
down()
PopCornPopper
on()
off()
pop()
25 Mayıs 13 Cumartesi
on()
off()
eject()
pause()
…
TheatherLights
on()
off()
dim()
DvdPlayer
on()
off()
eject()
pause()
…
Projector
on()
off()
tvMode()
wideScreen()
…
25 Mayıs 13 Cumartesi
25 Mayıs 13 Cumartesi
Two ways to code Menu
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Lahmacun Menu
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Adana Menu
25 Mayıs 13 Cumartesi
We want to be able to the

printMenu()

printLahmacunMenu()

printAdanaMenu()

printSpicyMenu()

isItemSpicy(name)
25 Mayıs 13 Cumartesi
Implementing
25 Mayıs 13 Cumartesi
The Iterator
25 Mayıs 13 Cumartesi
Iterator Pattern
<<Interface>>
Iterator
hasNext()
next()
AdanaMenuIterator
hasNext()
next()
25 Mayıs 13 Cumartesi
AdanaMenuIterator
25 Mayıs 13 Cumartesi
New implementation
25 Mayıs 13 Cumartesi
Overview of What We Did
LahmacunMenu
menuItems
createIterator()
AdanaMenu
menuItems
createIterator()
Waitress
printMenu()
<<Interface>>
Iterator
hasNext()
next()
AdanaMenuIterator
hasNext()
next()
LahmacunMenuIterator
hasNext()
next()
25 Mayıs 13 Cumartesi
25 Mayıs 13 Cumartesi
25 Mayıs 13 Cumartesi
Composite Pattern
Client
Component
operation()
add(Component)
remove(Component)
getChild(int)
Leaf
operation()
25 Mayıs 13 Cumartesi
Composite
add(Component)
remove(Component)
getChild(int)
operation()
Composite Pattern
Waitress
MenuComponent
getName()
getDescription()
….
add(Component)
remove(Component)
getChild(int)
25 Mayıs 13 Cumartesi
MenuItem
Menu
getName()
getDescription()
menuComponents
getName()
…
add(Component)
remove(Component)
getChild(int
Let’s see the code
25 Mayıs 13 Cumartesi
Menu Item
25 Mayıs 13 Cumartesi
Composite Menu
25 Mayıs 13 Cumartesi
How to print sub menus
25 Mayıs 13 Cumartesi
How are we going to iterate

We need a Stack to push the Iterators
into.

Add createIterator to Menu and
CompositeMenu

MenuItem returns a NullIterator !!!
25 Mayıs 13 Cumartesi
CompositeIterator
25 Mayıs 13 Cumartesi
A Null Iterator
25 Mayıs 13 Cumartesi