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Why static this abstract factory?

1 reply on 1 page. Most recent reply: Jun 26, 2002 8:13 PM by Karl Laird

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kwanghui

Posts: 1
Nickname: burn
Registered: Jun, 2002

Why static this abstract factory?

Posted: Jun 20, 2002 6:52 AM

abstract class ShapeFactory {
private static Map factories = new HashMap();
public static void addFactory(String id,ShapeFactory f) {factories.put(id, f);}
}
}
//===============================================
abstract class jub3 {
private static class Factory extends ShapeFactory {
protected Object create() { return new someClass(); }
}

why do I add the static here?
Will it increase or fasten my performance?
Is this the best way to write the code?

static { ShapeFactory.addFactory("jub3", new Factory());}
};

Thanks
KH

Karl Laird

Posts: 2
Nickname: iiq374
Registered: Jun, 2002

Re: Why static this abstract factory?

Posted: Jun 26, 2002 8:13 PM

It is not a performance issue so much as a getting the design pattern to work problem. By making it static it means that all instances are sharing the same hashmap - which means that they can all actually find the factories just by creating an abstract factory and grabbing one out of the hashmap (presuming something else has initialised the factories) This greatly eases the burdern of parenthood seeking.

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