Static Class Structure

• Director
  • Refers to the Builder interface to create parts of a complex object.
  • Is independent of how the complex object is created (which concrete classes are instanti­ated, i.e., which representation is created).
  • Maintains a reference (builder) to a Builder object.
• Builder
  • Defines an interface for creating parts of a complex object.
• Builder1,…
  • Implement the Builder interface by creating and assembling the parts of a complex object.

Dynamic Object Collaboration

• In this sample scenario, a Director object delegates creating and assembling the parts of a complex object to a Builder1 object.
  Let's assume that the Director is configured with a Builder1 object.
• The interaction starts with the Director that calls buildPartA() on the installed Builder1 object.
• Builder1 creates a ProductA1 object and adds it to the ComplexObject.
• Thereafter, the Director calls buildPartB() on Builder1.
• Builder1 creates a ProductB1 object and adds it to the ComplexObject.
• The Director can then get the assembled ComplexObject from the Builder1 and use it as required.
• See also Sample Code / Example 1.