工厂模式专门负责将大量有共同接口的类实例化。工厂模式可以动态决定将哪一个类实例化,不必事先知道每次要实例化哪一个类。工厂模式有以下几种形态:
· 简单工厂(Simple Factory)模式
· 工厂方法(Factory Method)模式
· 抽象工厂(Abstract Factory)模式
Simple Factory模式根据提供给它的数据,返回几个可能类中的一个类的实例。通常它返回的类都有一个公共的父类和公共的方法。
Simple Factory模式实际上不是GoF 23个设计模式中的一员。
下面我们来看看一个Simple Factory的例子:
以上为整个类结构的UML图。
工厂类角色Creator (PersonSimFactory):工厂类在客户端的直接控制下(GetPerson方法)创建产品对象。
抽象产品角色Product (Person):定义简单工厂创建的对象的父类或它们共同拥有的接口。可以是一个类、抽象类或接口(我们这里使用了类为例)当然你也可以把下面的Person类改为abstract类,把GetInfo()变为abstract函数来运行或者可以将Person变为Interface,将实现延迟到子类中也没有问题。
具体产品角色CreatedProduct (WritePerson, YellowPerson,BlackPerson):定义工厂具体加工出的对象。
具体代码(C#):
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具体代码(Pascal):
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我们甚至可以将抽象产品类作为子类的工厂:
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程序代码(Pascal)
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我们甚至可以将3种角色全部合并!
程序代码(C#):
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程序代码(Pascal)
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注意上面Pascal代码由于功能上的限制其实已经退化。
小结:
简单工厂能返回具有相同方法的类的实例,他们可以是不同的派生子类的实例,也可以是实际上毫无关系仅仅是共享了相同借口的类。不管哪种形式,这些实例中的方法必须是相同的,并且能够交替使用。