Lets hear it for BUILDER

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Lets hear it for BUILDER!!!!!!!
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Builder The Intent \ Description

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

Source GOF
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• WHAT?!?_at_?!!_at_????

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Builder The Intent In English

• A client uses the builder pattern like an
  individual would use an interior designer and
  furniture maker to build furniture - the
  individual (Client) tells the designer what he
  wants, and the designer (Director), the furniture
  maker (Builder), and his tool (Concrete builders)
  create the furniture (Product)

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Builder Example 1
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Builder Example 1 UML
Builder
Furniture Maker
BuildFurniture()
ChairBuilder
DeskBuilder
TankBuilder
BuildFurniture() GetDesk()
BuildFurniture() GetChair()
BuildFurniture() GetTank()
Source GOF
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Why Use Builder?

• 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 are assembled
  
• The construction process must allow different
  representations for the object thats
  constructed
  
• Builder is very useful because it allows the
  program to create a flexible number of objects
  you can add or delete objects as necessary

Source GOF
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Builder The Steps
Source GOF
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Builder Example 2
Source GOF