It could be clearer (especially the last sentence), but it seems to me that it's telling you what to do, rather than what the SDK will do. But I assume the Cursor class (which I don't use often, so take this with a grain of salt) would respect the IUID interface and not require you to specify the individual fields when trying to seek to a particular instance.
-Josh On Wed, Nov 26, 2008 at 3:45 AM, erdal <[EMAIL PROTECTED]> wrote: > Thanks for the clarification but I have a feeling that I would not be the > last person make similar assumtions after reading sections like this from > the Developer's guide. > > -- Excerpt from the section 'Data providers and the uid property' ---- > > "If Flex must consider two or more different objects to be identical, the > objects must implement the IUID interface so that you can assign the same > uid value to multiple objects. A typical case where you must implement the > IUID interface is an application that uses paged collections. As the cursor > moves through the collection, a particular item might be pulled down from > the server and released from memory repeatedly. Every time the item is > pulled into memory, a new object is created to represent the item. If you > need to compare items for equality, Flex should consider all objects that > represent the same item to be the same "thing." > > > --- In [email protected], Alex Harui <[EMAIL PROTECTED]> wrote: > > > > UID is mainly used by selection management in the list classes. It is not > used by actionscript for testing object equality > > > > From: [email protected] [mailto:[EMAIL PROTECTED] On > Behalf Of erdal > > Sent: Monday, November 24, 2008 1:32 PM > > To: [email protected] > > Subject: [flexcoders] UID, how is it used ? > > > > > > I think I am misinterpreting the uid property usage > http://livedocs.adobe.com/flex/3/html/help.html?content=about_dataproviders_8.html > > > > In a BlazeDS application I am using an ArrayCollection of items (VOs) > returned from the server. I thought when I implement the iuid interface, > that will guide flex framework for deciding on objects equality and then I > can use the getItemIndex(Obj) kind of functions. But It didn't work. So I > wrote this simple test. > > > > I was expecting to see person1 and clone1 would pass equality test. But > they didn't. What am I missing ? I am actually looking for something I can > use like Java equals. > > > > -- File Person.as > ----------------------------------------------------------------------------------------- > > > > package > > { > > import mx.core.IUID; > > public class Person implements IUID { > > public var _uid:String; > > > > public function get uid(): String { > > return _uid; > > } > > > > public function Person() { > > } > > > > public function set uid(value: String): void { > > _uid=value; > > } > > } > > } > > > > -- File test.mxml -------------------------------------------- > > > > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; > layout="vertical"> > > <mx:Script> > > <![CDATA[ > > public function onClick():void > > { > > var person1:Person = new Person(); > > var person2:Person = new Person(); > > var clone1:Person = new Person(); > > person1.uid = "1"; > > person2.uid = "2"; > > clone1.uid = "1"; > > trace("UIDs are person1:"+person1.uid+" person2:"+person2.uid+" > clone1:"+clone1.uid); > > trace("Is person1 and person2 equal ? " + (person1 == person2)); > > trace("Is person1 and twin1 equal ? " + (person1 == clone1)); > > } > > > > ]]> > > </mx:Script> > > <mx:Button label="run equality test" click="onClick()" /> > > </mx:Application> > > > > -- "Therefore, send not to know For whom the bell tolls. It tolls for thee." Like the cut of my jib? Check out my Flex blog! :: Josh 'G-Funk' McDonald :: 0437 221 380 :: [EMAIL PROTECTED] :: http://flex.joshmcdonald.info/ :: http://twitter.com/sophistifunk
