/* Note:
* Notice that both _instance & getInstance() are static. Thus, _instance exists before
* any objects of the class have been created, and getInstance() can be called for the
* class and so it can be called before there are any objects.
*/
package mvc
{
import mx.collections.ArrayCollection;
/* Because ActionScript requires that all constructors are public, you can't prevent
* anyone from making more Model Objects. Even without an explicit constructor, it
* would appear as if it can't happen but unfortunately, but the compiler will still
* synthesisize a default public constructor. Thus singleton behavior can only happen
* by convention and the best you can do is communicate the intent of the pattern
*/
public class Model
{
private static var _instance:Model;
[Bindable]
public var buddies:ArrayCollection = new ArrayCollection( [ "ChrisAIV", "Jimmy", "Sandy", "Frosie" ] );
public static function getInstance():Model
{
if( !_instance ) _instance = new Model();
return _instance;
}
}
}