Runtime Bukkit Commands

RuntimeCommands.java

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.util.List;

import org.bukkit.Bukkit;
import org.bukkit.command.CommandMap;
import org.bukkit.command.PluginCommand;
import org.bukkit.plugin.Plugin;
import org.bukkit.plugin.SimplePluginManager;

public class RuntimeCommands {

    public static void registerCommand(Plugin plugin, String name,
            List<String> aliases, String usage, String description, String permission, String permissionMessage) {
        PluginCommand command = null;

        try {
            Constructor<PluginCommand> c = PluginCommand.class.getDeclaredConstructor(String.class, Plugin.class);
            c.setAccessible(true);

            command = c.newInstance(name, plugin);
            
            getCommandMap().register(plugin.getDescription().getName(), command);
            if (description != null) {
                command.setDescription(description.toString());
            }

            if (usage != null) {
                command.setUsage(usage.toString());
            }

            if (aliases != null) {
                command.setAliases(aliases);
            }

            if (permission != null) {
                command.setPermission(permission);
            }

            if (permissionMessage != null) {
                command.setPermissionMessage(permissionMessage);
            }
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        }
        
    }

    public static CommandMap getCommandMap() {
        CommandMap commandMap = null;

        try {
            if (Bukkit.getPluginManager() instanceof SimplePluginManager) {
                Field f = Bukkit.getPluginManager().getClass().getDeclaredField("commandMap");
                f.setAccessible(true);

                commandMap = (CommandMap) f.get(Bukkit.getPluginManager());
            }
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }

        return commandMap;
    }
}