@Override
      protected @Nullable SerializedStubTree computeValue(@NotNull FileContent inputData) {
        StubBuilderType subIndexerType = calculateSubIndexer(inputData);
        if (subIndexerType == null) {
          if (LOG.isDebugEnabled()) {
            LOG.debug("Stub builder not found for " + inputData.getFile() + ", " + calculateIndexingStamp(inputData));
          }
          return null;
        }
        return computeValue(inputData, Objects.requireNonNull(subIndexerType));
      }
@Override
      protected @Nullable SerializedStubTree computeValue(@NotNull FileContent inputData)