code: public static <T> T find(Class<T> factoryClass, Descriptor descriptor) {
  		Preconditions.checkNotNull(descriptor);
  		return findInternal(factoryClass, descriptor.toProperties(), Optional.empty());
  	}
docs: Finds a table factory of the given class and descriptor.
  
  @param factoryClass desired factory class
  @param descriptor descriptor describing the factory configuration
  @param <T> factory class type
  @return the matching factory