Abstract Factory Pattern (original) (raw)

Last Updated : 8 Apr, 2026

The Abstract Factory Pattern is a creational design pattern that provides an interface for creating families of related or dependent objects without specifying their concrete classes. It acts as a "factory of factories," where a super-factory creates other factories that in turn produce specific objects.

Works around a super-factory that produces multiple factories.
Concrete factories created at runtime decide the actual product types.
Useful when the system needs to be independent of how products are created or represented.
Makes it easy to switch between different groups of related objects without code changes.

**Example: A UI theme system supports Light and Dark themes, where each theme provides its own set of components like Button and TextBox. The application uses a factory to create these components, allowing it to switch between themes without changing the main code.

uicomponentfactory

Abstract Factory Pattern

In the above Diagram

The diagram shows two factories, LightThemeFactory and DarkThemeFactory, that create UI components.
Each factory produces related components like Button and TextBox, ensuring consistency within a theme.
The client uses the abstract factory, allowing easy theme switching without changing core code.

Real Life Applications

The Abstract Factory Pattern is widely used to provide a consistent way to create related objects across different platforms or systems.

In applications that need to support multiple cloud platforms (e.g., AWS, Azure, Google Cloud), the Abstract Factory Pattern facilitates the creation of cloud-specific services. An abstract factory can define interfaces for services like storage, compute, and networking.
In applications that need to support multiple database systems (e.g., SQL, NoSQL), the Abstract Factory Pattern can be used to create database connections and queries. An abstract factory defines interfaces for creating database-related objects.

Components

To understand abstract factory pattern, we have to understand the components of it and relationships between them.

**Abstract Factory: It provides a way such that concrete factories follow a common interface, providing consistent way to produce related set of objects.
**Concrete Factories: Concrete Factories implement the rules specified by the abstract factory. It contain the logic for creating specific instances of objects within a family.
**Abstract Products: It acts as an abstract or interface type that all concrete products within a family must follow to and provides a unified way for concrete products to be used interchangeably.
**Concrete Products: They implement the methods declared in the abstract products, ensuring consistency within a family and belong to a specific category or family of related objects.
**Client: Client utilizes the abstract factory to create families of objects without specifying their concrete types and interacts with objects through abstract interfaces provided by abstract products.

Features

The Abstract Factory Pattern provides a structured way to create related objects while keeping client code independent of their concrete implementations.

Creates families of related or dependent objects.
Provides an interface for creating multiple related products.
Promotes consistency among products of the same family.

Implementation Example

Understand Abstract Factory Design Pattern using an example:

**Imagine you're managing a global car manufacturing company

You want to design a system to create cars with specific configurations for different regions, such as North America and Europe.

Each region may have unique requirements and regulations, and you want to ensure that cars produced for each region meet those standards.

Challenges while implementing this system

Different regions have different cars with different features, so designing this can be challenging.
The other main challenge is to ensure consistency in the production of cars and their specifications within each region.
There can be updation in having new cars in different regions so adapting the system to changes in regulations or introducing new features for a specific region becomes challenging.
So, Modifications would need to be made in multiple places, increasing the chances of introducing bugs and making the system more prone to errors.

Solution of above challenges by Abstract Factory Pattern

Below is how abstract factory pattern help to solve the above challenges. After using this pattern:

Different regions has their own factory to create cars for local needs.
This helps to keeps the design and features the same for vehicles in each region.
You can change one region without affecting others (e.g., updating North America doesn’t impact Europe).
To add a new region, just create a new factory, no need to change existing code.
The pattern keeps car creation separate from how they are used.

class_diagram_of_abstract_factory_pattern-1

Class Diagram

Code of above problem statement:

1. Abstract Factory Interface (CarFactory)

"CarFactory" is a Abstract Factory Interface that defines methods for creating cars and their specifications.

C++ `

/* Abstract Factory Interface / class CarFactory { public: virtual Car createCar() = 0; virtual CarSpecification* createSpecification() = 0; };

Java

/* Abstract Factory Interface */ interface CarFactory { Car createCar(); CarSpecification createSpecification(); }

Python

""" Abstract Factory Interface """ from abc import ABC, abstractmethod

class CarFactory(ABC): @abstractmethod def createCar(self): pass

@abstractmethod
def createSpecification(self):
    pass

JavaScript

/* Abstract Factory Interface */ class CarFactory { createCar() { throw new Error('Method not implemented.'); }

createSpecification() {
    throw new Error('Method not implemented.');
}

}

2. Concrete Factories (NorthAmericaCarFactory and EuropeCarFactory)

"NorthAmericaCarFactory" and "EuropeCarFactory" are concrete factories that implement the abstract factory interface "CarFactory" to create cars and specifications specific to North America, Europe.

C++ `

#include #include "Car.h" #include "CarSpecification.h"

class NorthAmericaCarFactory : public CarFactory { public: std::unique_ptr createCar() override { return std::make_unique(); }

std::unique_ptr<CarSpecification> createSpecification() override {
    return std::make_unique<NorthAmericaSpecification>();
}

};

class EuropeCarFactory : public CarFactory { public: std::unique_ptr createCar() override { return std::make_unique(); }

std::unique_ptr<CarSpecification> createSpecification() override {
    return std::make_unique<EuropeSpecification>();
}

};

Java

// Concrete Factory for North America Cars class NorthAmericaCarFactory implements CarFactory { public Car createCar() { return new Sedan(); }

public CarSpecification createSpecification() {
    return new NorthAmericaSpecification();
}

}

// Concrete Factory for Europe Cars class EuropeCarFactory implements CarFactory { public Car createCar() { return new Hatchback(); }

public CarSpecification createSpecification() {
    return new EuropeSpecification();
}

}

Python

Concrete Factory for North America Cars

class NorthAmericaCarFactory(CarFactory): def create_car(self): return Sedan()

def create_specification(self):
    return NorthAmericaSpecification()

Concrete Factory for Europe Cars

class EuropeCarFactory(CarFactory): def create_car(self): return Hatchback()

def create_specification(self):
    return EuropeSpecification()

JavaScript

// Concrete Factory for North America Cars class NorthAmericaCarFactory { createCar() { return new Sedan(); }

createSpecification() {
    return new NorthAmericaSpecification();
}

}

// Concrete Factory for Europe Cars class EuropeCarFactory { createCar() { return new Hatchback(); }

createSpecification() {
    return new EuropeSpecification();
}

}

3. Abstract Products (Car and CarSpecification interfaces)

Define interfaces for cars and specifications to ensure a common structure.

C++ `

/* Abstract Product Interface for Cars */ class Car { public: virtual void assemble() = 0; };

/* Abstract Product Interface for Car Specifications */ class CarSpecification { public: virtual void display() = 0; };

Java

// Abstract Product Interface for Cars interface Car { void assemble(); }

// Abstract Product Interface for Car Specifications interface CarSpecification { void display(); }

Python

Abstract Product Interface for Cars

from abc import ABC, abstractmethod

class Car(ABC): @abstractmethod def assemble(self): pass

Abstract Product Interface for Car Specifications

class CarSpecification(ABC): @abstractmethod def display(self): pass

JavaScript

// Abstract Product Interface for Cars class Car { assemble() { throw new Error('Method not implemented.'); } }

// Abstract Product Interface for Car Specifications class CarSpecification { display() { throw new Error('Method not implemented.'); } }

4. Concrete Products (Sedan, Hatchback, NorthAmericaSpecification, EuropeSpecification)

"Sedan", "Hatchback", "NorthAmericaSpecification", "EuropeSpecification" are concrete products that implement the interfaces to create specific instances of cars and specifications.

C++ `

// Concrete Product for Sedan Car class Car { public: virtual void assemble() = 0; };

class Sedan : public Car { public: void assemble() { std::cout << "Assembling Sedan car." << std::endl; } };

// Concrete Product for Hatchback Car class Hatchback : public Car { public: void assemble() { std::cout << "Assembling Hatchback car." << std::endl; } };

// Concrete Product for North America Car Specification class CarSpecification { public: virtual void display() = 0; };

class NorthAmericaSpecification : public CarSpecification { public: void display() { std::cout << "North America Car Specification: Safety features compliant with local regulations." << std::endl; } };

// Concrete Product for Europe Car Specification class EuropeSpecification : public CarSpecification { public: void display() { std::cout << "Europe Car Specification: Fuel efficiency and emissions compliant with EU standards." << std::endl; } };

Java

// Concrete Product for Sedan Car interface Car { void assemble(); }

class Sedan implements Car { public void assemble() { System.out.println("Assembling Sedan car."); } }

// Concrete Product for Hatchback Car class Hatchback implements Car { public void assemble() { System.out.println("Assembling Hatchback car."); } }

// Concrete Product for North America Car Specification interface CarSpecification { void display(); }

class NorthAmericaSpecification implements CarSpecification { public void display() { System.out.println("North America Car Specification: Safety features compliant with local regulations."); } }

// Concrete Product for Europe Car Specification class EuropeSpecification implements CarSpecification { public void display() { System.out.println("Europe Car Specification: Fuel efficiency and emissions compliant with EU standards."); } }

Python

Concrete Product for Sedan Car

class Car: def assemble(self): pass

class Sedan(Car): def assemble(self): print("Assembling Sedan car.")

Concrete Product for Hatchback Car

class Hatchback(Car): def assemble(self): print("Assembling Hatchback car.")

Concrete Product for North America Car Specification

class CarSpecification: def display(self): pass

class NorthAmericaSpecification(CarSpecification): def display(self): print("North America Car Specification: Safety features compliant with local regulations.")

Concrete Product for Europe Car Specification

class EuropeSpecification(CarSpecification): def display(self): print("Europe Car Specification: Fuel efficiency and emissions compliant with EU standards.")

JavaScript

// Concrete Product for Sedan Car class Car { assemble() { throw new Error('Method not implemented.'); } }

class Sedan extends Car { assemble() { console.log('Assembling Sedan car.'); } }

// Concrete Product for Hatchback Car class Hatchback extends Car { assemble() { console.log('Assembling Hatchback car.'); } }

// Concrete Product for North America Car Specification class CarSpecification { display() { throw new Error('Method not implemented.'); } }

class NorthAmericaSpecification extends CarSpecification { display() { console.log('North America Car Specification: Safety features compliant with local regulations.'); } }

// Concrete Product for Europe Car Specification class EuropeSpecification extends CarSpecification { display() { console.log('Europe Car Specification: Fuel efficiency and emissions compliant with EU standards.'); } }

Complete code for the above example

Below is the complete code for the above example:

C++ `

#include #include

class Car { public: virtual void assemble() = 0; virtual ~Car() { } };

class CarSpecification { public: virtual void display() = 0; virtual ~CarSpecification() { } };

class CarFactory { public: virtual std::unique_ptr createCar() = 0; virtual std::unique_ptr createSpecification() = 0; virtual ~CarFactory() { } };

// Concrete Product for Sedan Car class Sedan : public Car { public: void assemble() override { std::cout << "Assembling Sedan car." << std::endl; } };

// Concrete Product for Hatchback Car class Hatchback : public Car { public: void assemble() override { std::cout << "Assembling Hatchback car." << std::endl; } };

// Concrete Product for North America Car Specification class NorthAmericaSpecification : public CarSpecification { public: void display() override { std::cout << "North America Car Specification: Safety features compliant with local regulations." << std::endl; } };

// Concrete Product for Europe Car Specification class EuropeSpecification : public CarSpecification { public: void display() override { std::cout << "Europe Car Specification: Fuel efficiency and emissions compliant with EU standards." << std::endl; } };

// Concrete Factory for North America Cars class NorthAmericaCarFactory : public CarFactory { public: std::unique_ptr createCar() override { return std::make_unique(); } std::unique_ptr createSpecification() override { return std::make_unique(); } };

// Concrete Factory for Europe Cars class EuropeCarFactory : public CarFactory { public: std::unique_ptr createCar() override { return std::make_unique(); } std::unique_ptr createSpecification() override { return std::make_unique(); } };

// Client Code int main() { // Creating cars for North America CarFactory *northAmericaFactory = new NorthAmericaCarFactory(); auto northAmericaCar = northAmericaFactory->createCar(); auto northAmericaSpec = northAmericaFactory->createSpecification();

northAmericaCar->assemble();
northAmericaSpec->display();

// Creating cars for Europe
CarFactory *europeFactory = new EuropeCarFactory();
auto europeCar = europeFactory->createCar();
auto europeSpec = europeFactory->createSpecification();

europeCar->assemble();
europeSpec->display();

delete northAmericaFactory;
delete europeFactory;
return 0;

}

Java

// Abstract Factory Interface interface CarFactory { Car createCar(); CarSpecification createSpecification(); }

// Concrete Factory for North America Cars class NorthAmericaCarFactory implements CarFactory { public Car createCar() { return new Sedan(); }

public CarSpecification createSpecification()
{
    return new NorthAmericaSpecification();
}

}

// Concrete Factory for Europe Cars class EuropeCarFactory implements CarFactory { public Car createCar() { return new Hatchback(); }

public CarSpecification createSpecification()
{
    return new EuropeSpecification();
}

}

// Abstract Product Interface for Cars interface Car { void assemble(); }

// Abstract Product Interface for Car Specifications interface CarSpecification { void display(); }

// Concrete Product for Sedan Car class Sedan implements Car { public void assemble() { System.out.println("Assembling Sedan car."); } }

// Concrete Product for Hatchback Car class Hatchback implements Car { public void assemble() { System.out.println("Assembling Hatchback car."); } }

// Concrete Product for North America Car Specification class NorthAmericaSpecification implements CarSpecification { public void display() { System.out.println( "North America Car Specification: Safety features compliant with local regulations."); } }

// Concrete Product for Europe Car Specification class EuropeSpecification implements CarSpecification { public void display() { System.out.println( "Europe Car Specification: Fuel efficiency and emissions compliant with EU standards."); } }

// Client Code public class CarFactoryClient { public static void main(String[] args) { // Creating cars for North America CarFactory northAmericaFactory = new NorthAmericaCarFactory(); Car northAmericaCar = northAmericaFactory.createCar(); CarSpecification northAmericaSpec = northAmericaFactory.createSpecification();

    northAmericaCar.assemble();
    northAmericaSpec.display();

    // Creating cars for Europe
    CarFactory europeFactory = new EuropeCarFactory();
    Car europeCar = europeFactory.createCar();
    CarSpecification europeSpec
        = europeFactory.createSpecification();

    europeCar.assemble();
    europeSpec.display();
}

}

Python

from abc import ABC, abstractmethod

Abstract Products

class Car(ABC): @abstractmethod def assemble(self): pass

class CarSpecification(ABC): @abstractmethod def display(self): pass

Concrete Products

class Sedan(Car): def assemble(self): print("Assembling Sedan car.")

class Hatchback(Car): def assemble(self): print("Assembling Hatchback car.")

class NorthAmericaSpecification(CarSpecification): def display(self): print("North America Car Specification: Safety features compliant with local regulations.")

class EuropeSpecification(CarSpecification): def display(self): print("Europe Car Specification: Fuel efficiency and emissions compliant with EU standards.")

Abstract Factory

class CarFactory(ABC): @abstractmethod def create_car(self): pass

@abstractmethod
def create_specification(self):
    pass

Concrete Factories

class NorthAmericaCarFactory(CarFactory): def create_car(self): return Sedan()

def create_specification(self):
    return NorthAmericaSpecification()

class EuropeCarFactory(CarFactory): def create_car(self): return Hatchback()

def create_specification(self):
    return EuropeSpecification()

Client Code

def main(): factory = NorthAmericaCarFactory() car = factory.create_car() spec = factory.create_specification() car.assemble() spec.display()

factory = EuropeCarFactory()
car = factory.create_car()
spec = factory.create_specification()
car.assemble()
spec.display()

if name == "main": main()

JavaScript

// Abstract Products class Car { assemble() {} }

class CarSpecification { display() {} }

// Concrete Products class Sedan extends Car { assemble() { console.log("Assembling Sedan car."); } }

class Hatchback extends Car { assemble() { console.log("Assembling Hatchback car."); } }

class NorthAmericaSpecification extends CarSpecification { display() { console.log("North America Car Specification: Safety features compliant with local regulations."); } }

class EuropeSpecification extends CarSpecification { display() { console.log("Europe Car Specification: Fuel efficiency and emissions compliant with EU standards."); } }

// Factories class CarFactory { createCar() {} createSpecification() {} }

class NorthAmericaCarFactory extends CarFactory { createCar() { return new Sedan(); } createSpecification() { return new NorthAmericaSpecification(); } }

class EuropeCarFactory extends CarFactory { createCar() { return new Hatchback(); } createSpecification() { return new EuropeSpecification(); } }

// Client Code const northFactory = new NorthAmericaCarFactory(); let car = northFactory.createCar(); let spec = northFactory.createSpecification(); car.assemble(); spec.display();

const europeFactory = new EuropeCarFactory(); car = europeFactory.createCar(); spec = europeFactory.createSpecification(); car.assemble(); spec.display();

Output

Assembling Sedan car. North America Car Specification: Safety features compliant with local regulations. Assembling Hatchback car. Europe Car Specification: Fuel efficiency and emissions compliant wit...

Advantages

The Abstract Factory Pattern improves modularity, flexibility, and scalability in large systems.

Promotes loose coupling between client and product classes.
Makes switching product families easy without modifying client code.
Supports Open/Closed Principle.

Disadvantages

Although powerful, Abstract Factory can introduce complexity and additional overhead.

Increases number of classes and interfaces.
Can make the system more complex than necessary for small projects.
Adding a new product type requires modifying the abstract factory interface.