private ObjectAdapterMemento(final RootOid rootOid) {
   Ensure.ensureThatArg(rootOid, Oid.Matchers.isPersistent());
   this.persistentOidStr = rootOid.enString(getOidMarshaller());
   this.objectSpecId = rootOid.getObjectSpecId();
   this.type = Type.PERSISTENT;
 }