private List generateUpdates()

in src/main/java/com/googlesource/gerrit/plugins/replication/PushOne.java [624:669]
40 lines of code
10 McCabe index (conditional complexity)

  private List<RemoteRefUpdate> generateUpdates(Transport tn)
      throws IOException, PermissionBackendException {
    Optional<ProjectState> projectState = projectCache.get(projectName);
    if (!projectState.isPresent()) {
      return Collections.emptyList();
    }

    Map<String, Ref> local =
        git.getRefDatabase().getRefs().stream().collect(toMap(Ref::getName, r -> r));
    boolean filter;
    PermissionBackend.ForProject forProject = permissionBackend.currentUser().project(projectName);
    try {
      projectState.get().checkStatePermitsRead();
      forProject.check(ProjectPermission.READ);
      filter = false;
    } catch (AuthException | ResourceConflictException e) {
      filter = true;
    }
    if (filter) {
      if (!pushAllRefs) {
        // If we aren't mirroring, reduce the space we need to filter
        // to only the references we will update during this operation.
        //
        Map<String, Ref> n = new HashMap<>();
        for (String src : delta) {
          Ref r = local.get(src);
          if (r != null) {
            n.put(src, r);
          }
        }
        local = n;
      }
      local =
          forProject
              .filter(local.values(), git, RefFilterOptions.builder().setFilterMeta(true).build())
              .stream()
              .collect(toMap(Ref::getName, r -> r));
    }

    List<RemoteRefUpdate> remoteUpdatesList =
        pushAllRefs ? doPushAll(tn, local) : doPushDelta(local);

    return replicationPushFilter == null || replicationPushFilter.get() == null
        ? remoteUpdatesList
        : replicationPushFilter.get().filter(projectName.get(), remoteUpdatesList);
  }