private int getHashForKey ( long key ) { if ( tc . isEntryEnabled ( ) ) Tr . entry ( tc , "getHashForKey" , new Object [ ] { new Long ( key ) , this } ) ; int hash = ( int ) ( key % _mapSize ) ; if ( hash < 0 ) hash = - hash ; if ( tc . isEntryEnabled ( ) ) Tr . exit ( tc , "getHashForKey" , new Integer ( hash ) ) ; return hash ; }
suitable int index into the map