code: private boolean checkRestrictorService(RestrictorCheck pCheck, Object ... args) {
          try {
              ServiceReference[] serviceRefs = bundleContext.getServiceReferences(Restrictor.class.getName(),null);
              if (serviceRefs != null) {
                  boolean ret = true;
                  boolean found = false;
                  for (ServiceReference serviceRef : serviceRefs) {
                      Restrictor restrictor = (Restrictor) bundleContext.getService(serviceRef);
                      if (restrictor != null) {
                          ret = ret && pCheck.check(restrictor,args);
                          found = true;
                      }
                  }
                  return found && ret;
              } else {
                  return false;
              }
          } catch (InvalidSyntaxException e) {
              // Will not happen, since we dont use a filter here
              throw new IllegalArgumentException("Impossible exception (we don't use a filter for fetching the services)",e);
          }
      }
docs: Actual check which delegate to one or more restrictor services if available.
  
  @param pCheck a function object for performing the actual check
  @param args arguments passed through to the  check
  @return true if all checks return true