ActionScript 3.0 Design Patterns

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Chapter 2
CHAPTER 2

Factory Method Pattern 2

As experimentation becomes more complex, the need

for the cooperation in it of technical elements from

outside becomes greater and the modern laboratory

tends increasingly to resemble the factory and to

employ in its service increasing numbers of purely

routine workers.

—John Desmond Bernal

The medieval university looked backwards; it

professed to be a storehouse of old knowledge. The

modern university looks forward, and is a factory of

new knowledge.

—Thomas Huxley

One cannot walk through an assembly factory and not

feel that one is in Hell.

—W. H. Auden

What Is the Factory Method Pattern?

One of the most common statements in object-oriented programming (OOP) uses

thenewkeyword to instantiate objects from concrete classes. ActionScript applica-

tions that have multiple classes can have an abundance of code that looks like the

following:

public class Client

{

public function doSomething( )

{

var object:Object = new Product( );

object.manipulate( );

}

}

TheClientclass creates a new instance of theProductclass and assigns it to the

variableobject. There’s nothing wrong with this code, but it does create acoupling