import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.plugin.java.JavaPlugin;

import com.turt2live.xmail.XMail;
import com.turt2live.xmail.api.XMailAPI;
import com.turt2live.xmail.commands.ArgumentHandler;

public class SampleCustomArgument extends JavaPlugin {

    @Override
    public void onEnable(){

        // Insert xMail-is-actually-here check

        // Get the xMail plugin, you can do this in 2 ways...
        // Way 1:
        XMail xmail = XMail.getInstance();

        // Way 2:
        xmail = new XMailAPI().getPlugin();

        // Create your argument handler object
        MyArgumentHandler handler = new MyArgumentHandler();

        // Tell xMail to use that handler for that argument
        xmail.getCommandHandler().registerArgument("myargument", handler);
        xmail.getCommandHandler().registerArgument("myargument2", handler);
        // You can use the same handler for 2 arguments!
    }

    // Usually this would go in another file...
    public static class MyArgumentHandler implements ArgumentHandler {

        @Override
        public void runArgument(CommandSender sender, Command command, String[] args, String passedArgument){
            // sender = Who sent the command
            // command = xMail
            // args = Arguments after your argument. So "/xmail 1 2" would have the args "2" (if "1" was our defined argument)
            // passedArgument = "1" in the previous listing

            // Here you can run whatever code you need. Note that xMail's command handler does not
            // work like Bukkit's. You will need to do usage handling on your own (sorry!)
        }

    }

}