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Factory Method Pattern CSE776-Design Patterns By Anjan Kumar Bollam Professor Jim Fawcett
Intent ,[object Object]
It lets a class defer instantiation to subclasses at run time.
It refers to the newly created object through a common interface.,[object Object]
The main intent of the virtual constructor idiom in C++ is to create a copy of an object or a new object without knowing its concrete type and this is exactly the Factory Method of initialization.,[object Object],[object Object],[object Object]
Forces ,[object Object]
The client does not know the type of object that need to be created in advance and still want to perform operations on them.,[object Object]
A class can’t anticipate the class of objects it must create.
A class wants its subclasses to specify the objects it creates.
Localization of knowledge of helper sub classes which the classes want to delegate.,[object Object]
Participants ,[object Object]
Defines the interface of objects the factory method creates.
ConcreteProduct(ASP.SamplePage_aspx)
Implements the Product Interface
Creator(IHttpHandlerFactory)
Declares the factory method and may provide a default implementation for it.
It returns an object of type Product.
ConcreteCreator(PageHandlerFactory)
Overrides the factory method to return an instance of ConcreteProduct.,[object Object]
The Creator executes some sequence of operations on the object.,[object Object]

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Factory Method Pattern Explained