private IStorageUtilityIndexed indexedStorage()
{
if (!(storage is IStorageUtilityIndexed))
{
throw new System.SystemException("WrappingStorageUtility's factory is not of an indexed type, but had indexed operations requested. Please implement storage " + storage.getClass().getName() + " as indexed storage");
}
return((IStorageUtilityIndexed)storage);
}