The Builder pattern can be used to ease the construction of a complex object from simple objects. The Builder pattern also separates the construction of a complex object from its representation so that the same construction process can be used to create another composition of objects. Related patterns include Abstract Factory and Composite.
Where to use
•When the algorithm for creating a complex object should be independent of the parts that make up the object and how they are assembled.
•When the construction process must allow different representations for the object that is constructed.
•When you want to insulate clients from the knowledge of the actual creation process and/or resulting product.
•When the algorithm for creating a complex object should be independent of the parts that make up the object and how they are assembled.
•When the construction process must allow different representations for the object that is constructed.
•When you want to insulate clients from the knowledge of the actual creation process and/or resulting product.
Benefits
•The built object is shielded from the details of its construction.
•Code for construction is isolated from code for representation and both are easy to replace without affecting the other.
•Gives you control over the construction process.
•Gives you the possibility to reuse and/or change the process and/or product independently.
•The built object is shielded from the details of its construction.
•Code for construction is isolated from code for representation and both are easy to replace without affecting the other.
•Gives you control over the construction process.
•Gives you the possibility to reuse and/or change the process and/or product independently.
Drawbacks/consequences
Need flexibility in creating various complex objects. Need to create complex, aggregate objects.
Need flexibility in creating various complex objects. Need to create complex, aggregate objects.
Usage example
Some examples of using the Builder pattern in knowledge engineering include different generators. Parsers in various compilers are also designed using the Builder pattern.
Some examples of using the Builder pattern in knowledge engineering include different generators. Parsers in various compilers are also designed using the Builder pattern.
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