Applied Design Patterns with Java

Creational :: Builder (97) {C ch 7}

Applicability
Use the Builder pattern when

• the algorithm for creating a complex object should be independent of the parts that make up the object and how they're assembled.
• the construction process must allow different representations for the object that's constructed

Structure

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.

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