Design Pattern - Builder Pattern

Posted Date: 04 Jul 2008 Resource Type: Articles Category: General

Posted By: Jessie Member Level: Gold
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Points: 10

Builder Pattern:
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In this article I have explained Builder Pattern with a simple example.
Defenition:
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Seperation the construction of a complex object from its representation so that the same construction process can create different representation.

In simple words input to the Builder is different and the output from the Builder is different but the process is same.

Non Software Example:
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Consider Vending Machine. We can say it as a Director. It has a Builder to prepare coffee or tea. If we opt for Tea we will get Tea and if we opt for Coffee we will get coffee but the preparation is same[adding powder and hot water]. But the input in coffee/tea preparation is different[coffee powder or Tea powder] and the output is also different[Tea or Coffee]

In software Terms
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An appropriate ConcreteBuilder[coffee/tea Builder] is constructed and associated with a Director[Vending Machine]. The Director traverses and object graph and passes each object[powder and hotwater] to the Builder. The Builder uses each object to build-up a complex Product over time[Coffee or Tea]. When the object graph has been fully traversed, the final Prodcut can be retrieved from the Builder.

In .net XMLBuilder and StringBuilder works on this pattern. Consider StringBuilder. In this, the input is simple strings and output is a complex string and the process is concatenating string using a single variable.

Hope it sheds some light on Builder Pattern and it will help the beginners to get a clear understanding.

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