Hi Martin:
The problem I found was with the FactoryCreator.getServiceProvider
method - it starts out ...
> public Object getServiceProvider(final Class category,
> final Filter filter,
> final Hints hints,
> final Hints.Key key)
> throws FactoryRegistryException
> {
> final FactoryNotFoundException notFound;
> try {
> return super.getServiceProvider(category, filter, hints, key);
> } catch (FactoryNotFoundException exception) {
> // Will be rethrown later in case of failure to create the
> factory.
> notFound = exception;
> }
My problem is with line 113 (ie return super.getServiceProvider( ... ); )
In every case we were either directly returning the object provided by
the no argument constructor, or we were producing a
FactoryNotFoundException - at which point the later code would not work
either (as it needs the no argument constructor to work so it gets an
object back in order to get a Class to perform reflection on).
To "fix" this problem I was experimenting with something like this:
> final FactoryNotFoundException notFound;
> Factory found;
> try {
> found = (Factory) super.getServiceProvider(category,
> filter, hints, key);
> } catch (FactoryNotFoundException exception) {
> // Will be rethrown later in case of failure to create the
> factory.
> notFound = exception;
> }
..
> if( found != null ){
> return found;
> }
> else if( notFound != null ){
> throw notFound;
> }
> else {
> throw new FactoryNotFoundException("Could not locate
> instance of "+category)
> }
Using this kind of code I was able to get both:
- the no argument constructor to be called (required so an
implementation would be found)
- the hints constructor to be called
Debugging this is where I left off Friday,
Jody
> Jody Garnett a écrit :
>> Near as I can tell the FactoryRegistry implements used by GeoTools
>> seems to have no ability to construct implementations on the
>> CLASSPATH using user supplied hints. In every case a no argument
>> constructor is used (that refers to the global hints).
> * You must use the FactoryCreator subclass, not FactoryRegistry.
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