Dann brown

I am an Senior Fullstack Software Developer working in my skills and learning new stuffs about tech daily

Adapter Pattern

This is an example for implementation for Adapter pattern

concept

The Adapter Pattern converts the interface of a class into another interface the clients expect. Adapter lets classes work together that couldn’t otherwise because of incompatible interfaces

the situation is when you must to face several ways to create som kind element depeding combination of several parameters alt

Note: this is an example of Adapter patterns, its will be a series for implement all patterns in java / python / go

in the next classes you can see the implementation for apply the Adapter pattern and how in the MainClass call all implemantationfor show usage, you can see the flexibility for use this structure in the problem ducks and turkeys

abstraccions

public interface Duck {
	public void quack();
	public void fly();
}

public interface Turkey {
	public void gobble();
	public void fly();
}

public class TurkeyAdapter implements Duck {
	Turkey turkey;
 
	public TurkeyAdapter(Turkey turkey) {
		this.turkey = turkey;
	}
    
	public void quack() {
		turkey.gobble();
	}
  
	public void fly() {
		for(int i=0; i < 5; i++) {
			turkey.fly();
		}
	}
}

public class DuckAdapter implements Turkey {
	Duck duck;
	Random rand;
 
	public DuckAdapter(Duck duck) {
		this.duck = duck;
		rand = new Random();
	}
    
	public void gobble() {
		duck.quack();
	}
  
	public void fly() {
		if (rand.nextInt(5)  == 0) {
		     duck.fly();
		}
	}
}

public interface Drone {
	public void beep();
	public void spin_rotors();
	public void take_off();
}

public class DroneAdapter implements Duck {
	Drone drone;
 
	public DroneAdapter(Drone drone) {
		this.drone = drone;
	}
    
	public void quack() {
		drone.beep();
	}
  
	public void fly() {
		drone.spin_rotors();
		drone.take_off();
	}
}

Usage

public class MallardDuck implements Duck {
	public void quack() {
		System.out.println("Quack");
	}
 
	public void fly() {
		System.out.println("I'm flying");
	}
}

public class WildTurkey implements Turkey {
	public void gobble() {
		System.out.println("Gobble gobble");
	}
 
	public void fly() {
		System.out.println("I'm flying a short distance");
	}
}

public class SuperDrone implements Drone {
	public void beep() {
		System.out.println("Beep beep beep");
	}
	public void spin_rotors() {
		System.out.println("Rotors are spinning");
	}
	public void take_off() {
		System.out.println("Taking off");
	}
}

public class MainClass {
    
	public static void main(String[] args) {
		Duck duck = new MallardDuck();

		Turkey turkey = new WildTurkey();
		Duck turkeyAdapter = new TurkeyAdapter(turkey);

		System.out.println("The Turkey says...");
		turkey.gobble();
		turkey.fly();

		System.out.println("\nThe Duck says...");
		testDuck(duck);

		System.out.println("\nThe TurkeyAdapter says...");
		testDuck(turkeyAdapter);
		
		// Challenge
		Drone drone = new SuperDrone();
		Duck droneAdapter = new DroneAdapter(drone);
		testDuck(droneAdapter);
	}

	static void testDuck(Duck duck) {
		duck.quack();
		duck.fly();
	}
}