[eclipselink-users] Get result count from criteria query

[Dirk Reske <email@xxxxxxxxxxxx>]

Hello,

I build an criteria query, to get some entities from the database.
For pagination reasons, I set firstResult and maxResults to get only a 
subset of the total result.

Is there a way to get the whole entity count of this query, without 
manually building a second count query?
This is because I want to build a method in my service base class, that 
returns the paginated result, by giving it only the query object that 
returns the results.

I imagine something like this:

public<T> PaginatedResult<T> executeQuery(CriteriaQuery<T> query, 
Paginator paginator) {
 ....
}

The Paginator object includes firstResult and maxResults and the 
PaginatedResult contains the List<T> and a totalResults fields.
So the concrete service implementation has to build the query, to get 
its data, and the above method executes this and gets the data AND the 
total results, this query would return without pagination.
My problem is, that I have to build a second "count query", but in this 
method I've no informations about the where-clauses, etc attached to the 
query.

thanks
Dirk