In java, you can get a unique string for an object.
How can you do this in as3?
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Just to be clear, Java's hashCode() isn't exactly "unique"... hash collisions can still cause distinct objects to return the same hashCode() value.Zach Scrivena– Zach Scrivena2009-07-20 04:19:45 +00:00Commented Jul 20, 2009 at 4:19
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this is a helpful page ( morearty.com/blog/2008/07/28/… ), but the results are not unique... in fact, most are exactly the same for a given type of object.jedierikb– jedierikb2009-07-20 04:57:27 +00:00Commented Jul 20, 2009 at 4:57
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3 Answers
you can use this, to get a unique uint ... if you want to, convert it to a string ... :-P
package {
import flash.utils.Dictionary;
public class ObjectUIDUtil {
private static var _uids:Dictionary = new Dictionary(true);
private static var _cter:uint = 1;
public static function getUID(obj:Object):uint {
var ret:uint = _uids[obj];
return (ret == 0) ? (_uids[obj] = _cter++) : ret;
}
}
}
please note, that this maybe is not even necessary, since flash.utils.Dictionary allows using objects as keys directly ...
greetz
back2dos
2 Comments
Marty
I'm curious, what's the advantage of using
Dictionary over a normal Object? (I honestly don't know and am interested).
back2dos
The problem here is, that if you use any value as a key for an
Object the value is converted to a string and objects of the same type have the same string representation by default, so you'd get the same id for every instance of the same class. Dictionary leaves the value largely unmodified, although it will treat the String "1" and the int 1 as the same key, but it will distinguish non-primitive objects by their identity.in the same vain as the responses on the java thread, the is a unique ID generator as part of the flex SDK. This is found under mx.utils.UIDUtil, it works fairly simply.
var ID:String = UIDUtil.createUID();
Hope this helps.
1 Comment
jedierikb
Also in flex, there is createUniqueName in mx.utils.NameUtil
You can try using a third party hashing function (such as md5 or sha1). The hashcode for objects in Java (incidentally C#) is generated by a hashing function as well. Here's one I found on Google
Hope this helps.
