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package jargs.examples.gnu;
import jargs.gnu.CmdLineParser;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* This example shows how to dynamically create basic output for a --help option.
*/
public class AutoHelpParser extends CmdLineParser {
List optionHelpStrings = new ArrayList();
public Option addHelp(Option option, String helpString) {
optionHelpStrings.add(" -" + option.shortForm() + "/--" + option.longForm() + ": " + helpString);
return option;
}
public void printUsage() {
System.err.println("usage: prog [options]");
for (Iterator i = optionHelpStrings.iterator(); i.hasNext(); ) {
System.err.println(i.next());
}
}
public static void main( String[] args ) {
AutoHelpParser parser = new AutoHelpParser();
CmdLineParser.Option verbose = parser.addHelp(
parser.addBooleanOption('v', "verbose"),
"Print extra information");
CmdLineParser.Option size = parser.addHelp(
parser.addIntegerOption('s', "size"),
"The extent of the thing");
CmdLineParser.Option name = parser.addHelp(
parser.addStringOption('n', "name"),
"Name given to the widget");
CmdLineParser.Option fraction = parser.addHelp(
parser.addDoubleOption('f', "fraction"),
"What percentage should be discarded");
CmdLineParser.Option help = parser.addHelp(
parser.addBooleanOption('h', "help"),
"Show this help message");
try {
parser.parse(args);
}
catch ( CmdLineParser.OptionException e ) {
System.err.println(e.getMessage());
parser.printUsage();
System.exit(2);
}
if ( Boolean.TRUE.equals(parser.getOptionValue(help))) {
parser.printUsage();
System.exit(0);
}
// Extract the values entered for the various options -- if the
// options were not specified, the corresponding values will be
// null.
Boolean verboseValue = (Boolean)parser.getOptionValue(verbose);
Integer sizeValue = (Integer)parser.getOptionValue(size);
String nameValue = (String)parser.getOptionValue(name);
Double fractionValue = (Double)parser.getOptionValue(fraction);
// For testing purposes, we just print out the option values
System.out.println("verbose: " + verboseValue);
System.out.println("size: " + sizeValue);
System.out.println("name: " + nameValue);
System.out.println("fraction: " + fractionValue);
// Extract the trailing command-line arguments ('a_nother') 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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