Adapter Pattern

Also known as wrapper

Like UK plug to EU plug

Video

https://www.youtube.com/watch?v=2PKQtcJjYvc

Definition

The adapter pattern, converts the interface of a class into another interface the client accepts.

Code

Interface

interface ITarget{
  void request();
}

Concrete Adapter

class Adapter:ITarget{
 private Adaptee adaptee; 
 public Adapter (Adaptee a ){
    this.adaptee = a;
 }
 
 public void request(){
   this.adaptee.SpecificRequest()
 }
}

Concrete Adaptee

class Adaptee{
 public void specificRequest(){
 .....
 }
}

Client

ITarget target = new Adapter(new Adaptee()); 

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Another Definition

An object that fits another object in a given interface

Adapter design pattern is used when we have an object that contains functionality which we need but not in the way we want. An adapter helps us bridge the provided and the desired functionality.

Another Example

public interface Animal{
   public void move();
}
public class Lion implements Animal{
   public void move(){...}
}
public class TigerToy(){
   public void roll(){...}
}
public class TigerToyAdapter(){
   TigerToy tiger;
   
   public TigerToyAdapter(TigerToy tiger){
      this.tiger = tiger;
   }
   public void move(){
      tiger.roll();
   }
}
class Main{
   public static void main(String args[]){
      Lion lion = new Lion();
      TigerToyAdapter tiger= new TigerToyAdapter(new TigerToy());
      lion.move();
      tiger.move();
   }
}