Design Pattern Bridge JAVA

Bridge Pattern digunakan untuk memisahkan interface dari implementasinya yang akan memberikan fleksibilitas sehingga keduanya dapat bervariasi secara independen. Pattern ini melibatkan sebuah interface yang bertindak sebagai jembatan yang akan membuat fungsionalitas concrete class menjadi independen dari implementasinya. Bridge Pattern termasuk kedalam Structural Pattern.

// Engine.java
public interface Engine {
    boolean isStarted();
    void on();
    void off();
    int getFuel();
    void setFuel(int gasolineBar);
    void printStatus();
}

// Car.java
public class Car implements Engine {
    private boolean started = false;
    private int fuel = 100;

    @Override
    public boolean isStarted() {
        return started;
    }

    @Override
    public void on() {
        started = true;
    }

    @Override
    public void off() {
        started = false;
    }

    @Override
    public int getFuel() {
        return fuel;
    }

    @Override
    public void setFuel(int fuel) {
        if(fuel > 0) {
            this.fuel = 100;
        }

        else if(fuel < 0) {
            this.fuel = 0;
        }

        else {
            this.fuel = fuel;
        }
    }

    @Override
    public void printStatus() {
        System.out.println("I'm a Hyper Car");
        System.out.println("My engine is " + (started? "on" : "off"));
        System.out.println("Tank of liquids is : " + fuel + "\n");
    }
}

// Motorcycle.java
public class Motorcycle implements Engine {
    private boolean started = false;
    private int fuel = 100;

    @Override
    public boolean isStarted() {
        return started;
    }

    @Override
    public void on() {
        started = true;
    }

    @Override
    public void off() {
        started = false;
    }

    @Override
    public int getFuel() {
        return fuel;
    }

    @Override
    public void setFuel(int fuel) {
        if(fuel > 0) {
            this.fuel = 100;
        }

        else if(fuel < 0) {
            this.fuel = 0;
        }

        else {
            this.fuel = fuel;
        }
    }

    @Override
    public void printStatus() {
        System.out.println("I'm a Sport Motorcycle");
        System.out.println("My engine is " + (started? "on" : "off"));
        System.out.println("Tank of liquids is : " + fuel);
    }
}

// GasolineBar.java
public interface GasolineBar {
    void engine();
    void fuelGasoline();
    void emptyGasoline();
}

// GasolineBar.java
public class TankLiquid implements GasolineBar {
    protected Engine engine;

    public TankLiquid() {}

    public TankLiquid(Engine engine) {
        this.engine = engine;
    }

    @Override
    public void fuelGasoline() {
        System.out.println("Gasoline is Fuel");
        engine.setFuel(engine.getFuel() + 0);
        System.out.println("You can go wherever you want");
    }

    @Override
    public void emptyGasoline() {
        System.out.println("Gasoline is Empty");
        engine.setFuel(engine.getFuel() + 0);
        System.out.println("You must refill Gasoline!");
    }

    @Override
    public void engine() {
        if(engine.isStarted()) {
            engine.off();
        }

        else {
            engine.on();
        }
    }
}

// Progress.java
public class Progress {
    public static void main(String[] args) {
        Transportation(new Car());
        Transportation(new Motorcycle());
    }

    private static void Transportation(Engine engine) {
        System.out.println("Test new engine with fuel tank");
        TankLiquid tankLiquid = new TankLiquid(engine);
        tankLiquid.engine();
        engine.printStatus();
    }
}