question: public PersistentObject assertOneEntry ( ) throws EntryNotFoundException , UMSException { PersistentObject entry = null ; while ( hasMoreElements ( ) ) { entry = next ( ) ; break ; } if ( entry == null ) { throw new EntryNotFoundException ( ) ; } if ( hasMoreElements ( ) ) { abandon ( ) ; throw new UMSException ( i18n . getString ( IUMSConstants . MULTIPLE_ENTRY ) ) ; } return entry ; }
target:  Assert if the search result contains one and only one entry.