private int fastMatch(String sha1){
  Integer idx=_indexes.get(sha1);
  if (idx == null)   return -1;
 else   return idx.intValue();
}

private int fastMatch ( String sha1 ) { Integer idx = _indexes . get ( sha1 ) ; if ( idx == null ) return - 1 ; else return idx . intValue ( ) ; }
fast match - - lookup in the table .
