public Response apply()

in src/main/java/com/googlesource/gerrit/plugins/imagare/PutPreference.java [66:134]
62 lines of code
14 McCabe index (conditional complexity)

  public Response<String> apply(AccountResource rsrc, Input input)
      throws AuthException, RepositoryNotFoundException, IOException, UnprocessableEntityException,
          PermissionBackendException {
    if (self.get() != rsrc.getUser()) {
      permissionBackend.currentUser().check(ADMINISTRATE_SERVER);
    }
    if (input == null) {
      input = new Input();
    }

    String username = self.get().getUserName().get();

    ProjectLevelConfig storage = projectCache.getAllProjects().getConfig(pluginName + ".config");
    Config db = storage.get();
    boolean modified = false;

    String defaultProject = db.getString(PREFERENCE, username, KEY_DEFAULT_PROJECT);
    if (Strings.emptyToNull(input.defaultProject) != null) {
      if (projectCache.get(new Project.NameKey(input.defaultProject)) == null) {
        throw new UnprocessableEntityException(
            "project '" + input.defaultProject + "' does not exist");
      }
      if (!input.defaultProject.equals(defaultProject)) {
        db.setString(PREFERENCE, username, KEY_DEFAULT_PROJECT, input.defaultProject);
        modified = true;
      }
    } else {
      if (defaultProject != null) {
        db.unset(PREFERENCE, username, KEY_DEFAULT_PROJECT);
        modified = true;
      }
    }

    if (input.linkDecoration != null) {
      LinkDecoration linkDecoration =
          db.getEnum(PREFERENCE, username, KEY_LINK_DECORATION, LinkDecoration.NONE);
      if (!input.linkDecoration.equals(linkDecoration)) {
        db.setEnum(PREFERENCE, username, KEY_LINK_DECORATION, input.linkDecoration);
        modified = true;
      }
    } else {
      if (db.getNames(PREFERENCE, username).contains(KEY_LINK_DECORATION)) {
        db.unset(PREFERENCE, username, KEY_LINK_DECORATION);
        modified = true;
      }
    }

    boolean stage = db.getBoolean(PREFERENCE, username, KEY_STAGE, false);
    if (input.stage != null) {
      if (input.stage != stage) {
        db.setBoolean(PREFERENCE, username, KEY_STAGE, input.stage);
        modified = true;
      }
    } else {
      if (!stage) {
        db.unset(PREFERENCE, username, KEY_STAGE);
        modified = true;
      }
    }

    if (modified) {
      MetaDataUpdate md =
          metaDataUpdateFactory.create(projectCache.getAllProjects().getProject().getNameKey());
      md.setMessage("Update " + pluginName + " Preferences for '" + username + "'\n");
      storage.commit(md);
    }

    return Response.<String>ok("OK");
  }