SOLID in Dart

1_no_srp.dart

class Repository {
  String getData() {
    return dataSource();
  }

  String dataSource() {
    return 'data from data source';
  }
}

void main() {
  final repo = Repository();
  print(repo.dataSource());
}

1_with_srp.dart

class DataSource {
  String getData() {
    return 'SRP - data from data source';
  }
}

class Repository {
  final DataSource dataSource;

  Repository(this.dataSource);

  String getData() {
    return dataSource.getData();
  }
}

void main() {
  final dataSource = DataSource();
  final repo = Repository(dataSource);

  print(repo.getData());
}

2_no_ocp.dart

enum Shipping { JNE, JNT }

class Product {
  num calculateShippingPrice(int price, Shipping shipping) {
    switch (shipping) {
      case Shipping.JNE:
        return 12 / 100 * price;
      case Shipping.JNT:
        return 20 / 100 * price;
    }
  }
}

void main() {
  final product = Product();
  final price = product.calculateShippingPrice(10000, Shipping.JNE);
  print(price);
}

2_with_ocp.dart

abstract class Shipping {
  num calculateShippingPrice(int price);
}

class JNE implements Shipping {
  @override
  num calculateShippingPrice(int price) {
    return 12 / 100 * price;
  }
}

class JNT implements Shipping {
  @override
  num calculateShippingPrice(int price) {
    return 20 / 100 * price;
  }
}

class Product {
  num calculateShippingPrice(int price, Shipping shipping) {
    return shipping.calculateShippingPrice(price);
  }
}

void main() {
  final product = Product();
  final price = product.calculateShippingPrice(10000, JNE());
  print(price);
}

3_no_lsp.dart

abstract class Product {
  late String name;
  late DateTime expiredDate;
}

class Banana implements Product {
  @override
  String name = 'Sweet Banana';

  @override
  DateTime expiredDate = DateTime.now();
}

class Shoes implements Product {
  @override
  String name = 'Air Jordan';

  @override
  DateTime expiredDate = DateTime.now(); // Expired Date??
}

void main() {
  final banana = Banana();
  print(banana.name);
  print(banana.expiredDate);
}

3_with_lsp.dart

abstract class Product {
  late String name;
}

abstract class FoodProduct extends Product {
  late DateTime expiredDate;
}

class Banana implements FoodProduct {
  @override
  String name = 'Sweet Banana';

  @override
  DateTime expiredDate = DateTime.now();
}

class Shoes implements Product {
  @override
  String name = 'Air Jordan';
}

void main() {
  final banana = Banana();
  print(banana.name);
  print(banana.expiredDate);

  final shoes = Shoes();
  print(shoes.name);
}

4_no_isp.dart

abstract class Payment {
  late String paymentName;
  late int noCard;
}

class Bri implements Payment {
  @override
  String paymentName = 'BRI';

  @override
  int noCard = 12345;
}

class Ovo implements Payment {
  @override
  String paymentName = 'OVO';

  @override
  int noCard = 4312121; // no card??

}

void main() {
  final ovo = Ovo();
  print(ovo.paymentName);

  final bri = Bri();
  print(bri.paymentName);
}

4_with_isp.dart

abstract class Payment {
  late String paymentName;
}

abstract class Bank extends Payment {
  late int noCard;
}

abstract class EWallet extends Payment {
  late String phoneNumber;
}

class Bri implements Bank {
  @override
  String paymentName = 'BRI';

  @override
  int noCard = 12345;
}

class Ovo implements EWallet {
  @override
  String paymentName = 'OVO';

  @override
  String phoneNumber = '081333333333';
}

void main() {
  final ovo = Ovo();
  print(ovo.paymentName);

  final bri = Bri();
  print(bri.paymentName);
}

5_no_dip.dart

class Database {
  String create() {
    return 'Create Database';
  }

  String read() {
    return "Read Database";
  }
}

class Controller {
  final database = Database();

  String createData() => database.create();

  String readData() => database.read();
}

void main() {
  final controller = Controller();
  final result = controller.readData();

  print(result);
}

6_with_dip.dart

abstract class Database {
  String create();
  String read();
}

class MySQL implements Database {
  @override
  String create() {
    return 'MySQL Create Database';
  }

  @override
  String read() {
    return 'MySQL Read Database';
  }
}

class MongoDB implements Database {
  @override
  String create() {
    return 'MongoDB Create Database';
  }

  @override
  String read() {
    return 'MongoDB Read Database';
  }
}

class Controller {
  final Database database;

  Controller(this.database);

  String createData() => database.create();
  String readData() => database.read();
}

void main() {
  final controller = Controller(MySQL());
  final result = controller.readData();

  print(result);
}