question: protected void transfer ( String seqRange ) throws IOException { try { final int rangePos = seqRange . indexOf ( '-' ) ; if ( rangePos == - 1 ) { transfer ( Long . parseLong ( seqRange ) ) ; } else { final String start = seqRange . substring ( 0 , rangePos ) ; final String end = seqRange . substring ( rangePos + 1 ) ; final long startIdx ; if ( start . length ( ) == 0 ) { startIdx = 0 ; } else { startIdx = Long . parseLong ( start ) ; } final long endIdx ; if ( end . length ( ) == 0 ) { endIdx = mReader . numberSequences ( ) - 1 ; } else { endIdx = Long . parseLong ( end ) ; } if ( startIdx > endIdx ) { throw new NumberFormatException ( "Invalid range: " + seqRange ) ; } for ( long i = startIdx ; i <= endIdx ; i ++ ) { transfer ( i ) ; } } } catch ( final NumberFormatException e ) { warnInvalidSequence ( seqRange ) ; } }
target:  Transfer an interpreted sequence or set of sequences from the reader to the writer. This implementation allows IDs to be specified as a range, e.g. 123-456