Instantiate a Class picked from a Class Array

[ziriguidum]

I would like to change this:

obj = new _objectClass();

into something like this:

var objClass:Class = _objectClassArray[range(0, _objectClassArray.length)] as Class;
obj = new objClass();

trace (_objectClassArray[range(0, _objectClassArray.length)]) // returns [class MyClip] or [class MyClip2] and so on..

Actually this last piece of code throws the following error:

TypeError: Error #1007: Instantiation attempted on a non-constructor.


Full explanation:

This code goes inside an ObjectPool from HYPE Framework of Joshua Davis.

I´ve created a "MultipleObjectPool" and changed some little details , that is: the constructor, instead of receiving a Class as a parameter, receives then a Class Array, so each time it should create an object (via the request() function) of a Class that is picked randomically from the Class Array.

Is that possible ?

Thanks in advance!

[5TonsOfFlax]

Are you sure that the objects in your class array are Classes? Does range return a single random integer in the specified range?

If both of those are true, it should work.

I suspect you have something other than classes in your array (such as String), causing objClass to be null.

[cancerinform]

This example will give you the error you got, because Green is a string:

var myArray:Array = new Array("Green");
var objClass:Class = myArray[0] as Class;
var objisplayObjectContainer = new objClass() as DisplayObjectContainer;
addChild(obj);

Changing the first line will correct the mistake:
var myArray:Array = new Array(Green);

Probably the array members are all strings.

[ziriguidum]

Hi, I solved it this way:

obj = new _objectClassArray[range(0, _objectClassArray.length - 1)];

simple

I wonder now how could I extend the class ObjectPool
Cause I've just copied the whole code into a new .as file I called "MultipleObjectPool" and changed very little stuff on it.
But I know that's definitely not good practice.

So, these are the changes I've made in the "MultipleObjectPool" class:

1st - I added the "_objectClassArray" instance variable (not sure if it's called this way) , and removed the "_objectClass" instance variable since I didn't need it anymore.

2nd - The constructor changed:

		public function ObjectPool(objectClass:Class, max:uint) {
			_objectClass = objectClass;

becomes

		public function ObjectPool(objectClassArray:Array, max:uint) {
			_objectClassArray = objectClassArray;

3rd - in function request():

obj = new _objectClass();

becomes

obj = new _objectClassArray[range(0, _objectClassArray.length - 1)];

I'm not good enough in OOP to know how to do this... so please help! Then I can share it with you!

Thanks!

[ziriguidum]

hey, thanks for answering,

The objects in the array ware actually Classes.

i 'm still don't know why this didn't work:

var objClass:Class = _objectClassArray[range(0, _objectClassArray.length)] as Class;
obj = new objClass();

but the important thing is that this works:

obj = new _objectClassArray[range(0, _objectClassArray.length - 1)];

please read my previous post!

thanks!