factory-kit

Factory Kit Pattern

Intent

Define a factory of immutable content with separated builder and factory interfaces.

Applicability

Use the Factory Kit pattern when

• a class can't anticipate the class of objects it must create
• you just want a new instance of a custom builder instead of the global one
• you explicitly want to define types of objects, that factory can build
• you want a separated builder and creator interface

Structure

Participants

• FactoryKit
  • define an interface for operations that create product objects according to custom builder.
• AbstractProduct
  • declares an interface for a type of product object.
• ConcreteProduct
  • implements the AbstractProduct interface.
• Client
  • define custom builder for factory kit.
  • use factory kit to create project objects.

Example

In this example, the client(App) creates one of the Weapon objects specified directly in the factory-kit instance.

Participants in this example:

• WeaponFactoryKit is the FactoryKit.
• Weapon is the AbstractProduct.
• Axe/Bow/Sword are the ConcreteProduct.
• App is the Client.

Scala Tips

• use Map structure and lambda function to create define the custom builder.

Reference

• Java design patterns