Set the values of metadata properties from java

Hi everybody,
I created a metadata property "Category" in System Admin - System Config - KM - Global Services - Property Metadata.
My requirements:
When a user creates a document (upload or new txt file, etc.) in folder X the value of this metadata propery should also automatically be set to value X. So that the user doesn't need to set this value himself.
This way we can have more reliability on the accuracy of the metadata of this field.
Can anybody help me on how to set this property automatically in the screen for the creation of upload of a new file?
Thanks
Kind regards
Wouter

Hi Robert,
It's been a while but I'm back
We finally decided which way to go for this development (as it was on hold untill now) and we decided to go with the KM Repository service.
I already started implementing this service and So far it reacts on the creation of new documents (CREATE_CHILD event).
public void received(IEvent event)
   try{
       if(event instanceof IResourceEvent)
          IResourceEvent resevent = (IResourceEvent)event;
          switch(resevent.getType())
             case ResourceEvent.CREATE_CHILD:
                     IResource res = resevent.getResource();
                     break;
The resource (res) I get from the resourceEvent (resevent) is the parrent resource of the newly created resource. What I need is the newly created resoruce itself.
Do you happen to know if there is an interface or method somewhere through which I can get access to this new resource?
Otherwise the only way to do this would be to loop over the children of the parent folder and get the newest one. But this would just kill the performance as the folders keep on growing...

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