Interacting with the Environment - Java - page 78

*/
public

public char char getopt ( String argv []) {

Debug . println ( "getopt" ,
"optind=" + optind + ", argv.length=" + argv . length );

iif ( optind >= ( argv . length ) || ! argv [ optind ]. startsWith ( "-" )) {
done = true

true ;

}

// If we are finished (either now OR from before), bail.
// Do not collapse this into the "if" above
iif ( done ) {
return return DONE ;

}

optarg = null null ;

// XXX TODO - two-pass, 1st check long args, 2nd check for
// char, to allow advanced usage like "-no outfile" == "-n -o outfile".

// Pick off next command line argument, if it starts "-",
// then look it up in the list of valid args.
String thisArg = argv [ optind ];

iif ( thisArg . startsWith ( "-" )) {
for for ( GetOptDesc option : options ) {

iif (( thisArg . length () == 2 &&
option . getArgLetter () == thisArg . charAt ( 1 )) ||
( option . getArgName () != null null &&

option . getArgName (). equals ( thisArg . substring ( 1 )))) { // found it
// If it needs an option argument, get it.
iif ( option . takesArgument ()) {
iif ( optind < argv . length - 1 ) {
optarg = argv [++ optind ];
} else else {

throw throw new new IllegalArgumentException (

"Option " + option . getArgLetter () +
" needs value but found end of arg list" );

}

}
++ optind ;
return return option . getArgLetter ();

}

}
// Began with "-" but not matched, so must be error.
++ optind ;