code: public void setBase(String base) {
          if (base != null) {
              this.base = LdapUtils.newLdapName(base);
          } else {
              this.base = LdapUtils.emptyLdapName();
          }
      }
docs: Set the base suffix from which all operations should origin. If a base
  suffix is set, you will not have to (and, indeed, must not) specify the
  full distinguished names in any operations performed.
  
  @param base the base suffix.