The adapter design pattern adapter structure (class)

The Adapter Design Pattern... Adapter Structure ClassClient Request Target* Adapter SpecificRequest implementation specificRequest Adaptee Convert the interface of a class into anot

The Adapter Design Pattern

Adapter Structure (Class)

Client

Request()

Target*

Adapter

SpecificRequest() (implementation)

specificRequest()

Adaptee

Convert the interface of a class into another inteface clients expect.

Adapter Structure (Object)

Client

Request()

Target*

Request( )

Adapter

adaptee->SpecifricRequest() adaptee

specificRequest()

Adaptee

Adapter Consequences

ConstraintStateVariable

ConstraintVariable StateVariable

Adapter Implememntation 1

GetChildren(node)

CreateGraphicNode(Node)

Display()

BuildTree(Node n)

GetChildren(node)

CreateGraphicNode(Node)

FileSystemEntity (Adaptee)

GetChildren(n) for each child { AddGraphicNode(CreateGraphi cNode(child)) BuildTree(child)

}

Adapter Implementation 2

SetDelegate(Delegate)

Display()

BuildTree(Node n)

CreateGraphicNode(TreeDisplay, Node)

TreeAccessorDelegate* (Target)

GetChildren(TreeDisplay, Node) CreateGraphicNode(TreeDisplay, Node) CreateFile()

DeleteFile()

DirectoryBrowser (Adapter)

FileSystemEntity (Adaptee)

delegate->GetChildren(this, n)

for each child{

AddGraphicNode(

delegate->CreateGraphicNode(this, child)

)

BuildTree(child)

}

delegate

Adapter Known Uses

Object*

value:

value

ValueModel*

getBlock setBlock

value:

value

PluggableAdaptor

^ getBlock value:adaptee

adaptee