public static interface ServiceRegistry.Filter
ServiceRegistry.getServiceProviders to select
 providers matching an arbitrary criterion.  Classes that
 implement this interface should be defined in order to make use
 of the getServiceProviders method of
 ServiceRegistry that takes a Filter.boolean filter(Object provider)
true if the given
 provider object matches the criterion defined
 by this Filter.provider - a service provider Object. Submit a bug or feature 
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