private static Set<VirtualFile> getPackageRoots(Module module, String rootPackageVMName) {
    Set<VirtualFile> result = new HashSet<>();
    for (SourceFolder folder : getSourceFolders(module)) {
      final VirtualFile file = folder.getFile();
      if (file == null) continue;
      final String prefix = AnalysisUtils.fqnToInternalName(folder.getPackagePrefix());
      final VirtualFile relativeSrcRoot = file.findFileByRelativePath(StringUtil.trimStart(rootPackageVMName, prefix));
      if (relativeSrcRoot == null) continue;
      result.add(relativeSrcRoot);
    }
    return result;
  }
private static Set<VirtualFile> getPackageRoots(Module module, String rootPackageVMName)