How To Unregister a PluginCommand from Bukkit.

Hi,
For one of my plugin I searched a way to let the user disable some of the command and remove them from the bukkit CommandMap.

Here is the way to achieve it :

Code:java

 
    /**
     * Getting the private field of a another class;
     * 
     * @param object
     * @param field
     * @return
     * @throws SecurityException
     * @throws NoSuchFieldException
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     */
    private Object getPrivateField(Object object, String field) throws SecurityException,
            NoSuchFieldException, IllegalArgumentException, IllegalAccessException {
        Class<?> clazz = object.getClass();
        Field objectField = clazz.getDeclaredField(field);
        objectField.setAccessible(true);
        Object result = objectField.get(object);
        objectField.setAccessible(false);
        return result;
    }
 
    /**
     * Unregister a command from bukkit.
     * 
     * @param cmd
     */
    private void unRegisterBukkitCommand(PluginCommand cmd) {
        try {
            Object result = getPrivateField(plugin.getServer().getPluginManager(), "commandMap");
            SimpleCommandMap commandMap = (SimpleCommandMap) result;
            Object map = getPrivateField(commandMap, "knownCommands");
            @SuppressWarnings("unchecked")
            HashMap<String, Command> knownCommands = (HashMap<String, Command>) map;
            knownCommands.remove(cmd.getName());
            for (String alias : cmd.getAliases())
                knownCommands.remove(alias);
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }
 

 

Interesting.

 

Holy!? That worked! You solved an issue of mine that I've had for a couple weeks!

 

He also did that 8 months ago. Very interesting.