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package jargs.examples.gnu;
import jargs.gnu.CmdLineParser;
import java.text.DateFormat;
import java.text.ParseException;
import java.util.Locale;
import java.util.Date;
public class CustomOptionTest {
private static void printUsage() {
System.err.println("usage: prog [{-d,--date} date]");
}
/**
* A custom type of command line option corresponding to a short
* date value, e.g. .
*/
public static class ShortDateOption extends CmdLineParser.Option {
public ShortDateOption( char shortForm, String longForm ) {
super(shortForm, longForm, true);
}
protected Object parseValue( String arg, Locale locale )
throws CmdLineParser.IllegalOptionValueException {
try {
DateFormat dateFormat =
DateFormat.getDateInstance(DateFormat.SHORT, locale);
return dateFormat.parse(arg);
}
catch (ParseException e) {
throw new CmdLineParser.IllegalOptionValueException(this, arg);
}
}
}
public static void main( String[] args ) {
CmdLineParser parser = new CmdLineParser();
CmdLineParser.Option date =
parser.addOption(new ShortDateOption('d', "date"));
try {
parser.parse(args);
}
catch ( CmdLineParser.OptionException e ) {
System.err.println(e.getMessage());
printUsage();
System.exit(2);
}
// Extract the values entered for the various options -- if the
// options were not specified, the corresponding values will be
// null.
Date dateValue = (Date)parser.getOptionValue(date);
// For testing purposes, we just print out the option values
System.out.println("date: " + dateValue);
// Extract the trailing command-line arguments ('a_number') in the
// usage string above.
String[] otherArgs = parser.getRemainingArgs();
System.out.println("remaining args: ");
for ( int i = 0; i < otherArgs.length; ++i ) {
System.out.println(otherArgs[i]);
}
// In a real program, one would pass the option values and other
// arguments to a function that does something more useful.
System.exit(0);
}
}
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