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import gnu.getopt.LongOpt;
import gnu.getopt.Getopt;
/*
* This sample code was written by Aaron M. Renn and is a demonstration
* of how to utilize some of the features of the GNU getopt package. This
* sample code is hereby placed into the public domain by the author and
* may be used without restriction.
*/
public class GetoptDemo
{
public static void
main(String[] argv)
{
int c;
String arg;
LongOpt[] longopts = new LongOpt[3];
//
StringBuffer sb = new StringBuffer();
longopts[0] = new LongOpt("help", LongOpt.NO_ARGUMENT, null, 'h');
longopts[1] = new LongOpt("outputdir", LongOpt.REQUIRED_ARGUMENT, sb, 'o');
longopts[2] = new LongOpt("maximum", LongOpt.OPTIONAL_ARGUMENT, null, 2);
//
Getopt g = new Getopt("testprog", argv, "-:bc::d:hW;", longopts);
g.setOpterr(false); // We'll do our own error handling
//
while ((c = g.getopt()) != -1)
switch (c)
{
case 0:
arg = g.getOptarg();
System.out.println("Got long option with value '" +
(char)(new Integer(sb.toString())).intValue()
+ "' with argument " +
((arg != null) ? arg : "null"));
break;
//
case 1:
System.out.println("I see you have return in order set and that " +
"a non-option argv element was just found " +
"with the value '" + g.getOptarg() + "'");
break;
//
case 2:
arg = g.getOptarg();
System.out.println("I know this, but pretend I didn't");
System.out.println("We picked option " +
longopts[g.getLongind()].getName() +
" with value " +
((arg != null) ? arg : "null"));
break;
//
case 'b':
System.out.println("You picked plain old option " + (char)c);
break;
//
case 'c':
case 'd':
arg = g.getOptarg();
System.out.println("You picked option '" + (char)c +
"' with argument " +
((arg != null) ? arg : "null"));
break;
//
case 'h':
System.out.println("I see you asked for help");
break;
//
case 'W':
System.out.println("Hmmm. You tried a -W with an incorrect long " +
"option name");
break;
//
case ':':
System.out.println("Doh! You need an argument for option " +
(char)g.getOptopt());
break;
//
case '?':
System.out.println("The option '" + (char)g.getOptopt() +
"' is not valid");
break;
//
default:
System.out.println("getopt() returned " + c);
break;
}
//
for (int i = g.getOptind(); i < argv.length ; i++)
System.out.println("Non option argv element: " + argv[i] + "\n");
}
} // Class GetoptDemo
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