code: public UpdateSite.Plugin getInfo() {
          UpdateCenter uc = Jenkins.getInstance().getUpdateCenter();
          UpdateSite.Plugin p = uc.getPlugin(getShortName(), getVersionNumber());
          if (p != null) return p;
          return uc.getPlugin(getShortName());
      }
docs: returns the {@link hudson.model.UpdateSite.Plugin} object, or null.