Builder

Usage

• Separate object construction from its representation
• Separate the construction of a complex object from its representation so that the same construction process can create different representations

Diagram

Participants

Builder

• Specifies an abstract interface for creating parts of a Product object

ConcreteBuilder

• Constructs and assembles parts of the product by implementing the Builder interface
• Defines and keeps track of the representation it creates
• Provides an interface for retrieving the product

Director

• Constructs an object using the Builder interface

Product

• Represents the complex object under construction. ConcreteBuilder builds the product's internal representation and defines the process by which it's assembled
• Includes classes that define the constituent parts, including interfaces for assembling the parts into the final result