/**
  * Constructor.
  *
  * @param objectId Id of an object whose object mapping to construct. shall be one of ObjectIds.
  */
 public Builder(String idOfObject) {
   IdentityStoreAttributeMapping.validateId(idOfObject, "idOfObject");
   this._idOfObject = idOfObject;
   this._objectClassOfObject = null;
   this._storeAttributes = new HashMap<String, IdentityStoreAttributeMapping>();
 }