protected static void canSetAttribute(Group g, Field f, String value) throws  InsufficientPrivilegeException,
protected static Field canSetAttribute(Group g, String attr, String value) throws  AttributeNotFoundException, GroupModifyException, InsufficientPrivilegeException,
  protected static void canSetAttribute(Group g, Field f, String value)     throws  InsufficientPrivilegeException,            ModelException,            SchemaException  {    if ( (value == null) || (value.equals(GrouperConfig.EMPTY_STRING)) ) {      throw new ModelException(E.GROUP_AV);    }    if (f.getName().equals("displayExtension")) {      AttributeValidator.namingValue(value);    }    if (f.getName().equals("displayName")) {      AttributeValidator.namingValue(value);    }    canModAttribute(g, f);  } // protected static void canSetAttribute(g, f, value)