public static AuthorityIndexingService getIndexingService(ServiceManager serviceManager) {
if (indexingService == null) {
indexingService =
serviceManager.getServiceByName(
AuthorityIndexingService.class.getName(), AuthorityIndexingService.class);
}
return indexingService;
}
/**
* Construct a provider holder with all currently known providers of the given type.
*
* @param serviceManager the system service manager
* @param providerType the interface type of the providers we care about
*/
public ProviderStack(ServiceManager serviceManager, Class<T> providerType) {
providers = Collections.synchronizedList(new ArrayList<ProviderHolder<T>>());
List<T> foundProviders = serviceManager.getServicesByType(providerType);
// filter out the NotProviders first
for (Iterator<T> iterator = foundProviders.iterator(); iterator.hasNext(); ) {
T t = iterator.next();
if (t instanceof NotProvider) {
iterator.remove();
}
}
Collections.sort(foundProviders, new OrderedServiceComparator());
for (T t : foundProviders) {
providers.add(new ProviderHolder<T>(t));
}
}