Solved Blocking a command?

I'm currently trying to block a command or a list of commands that I store in a Array, then put it into the config. I fear this will not work. Can someone please tell me how I could/would properly block commands in the plugin? Thanks.

Code:

@EventHandler
    public void onChat(AsyncPlayerChatEvent event) {
        Player player = event.getPlayer();
        CombatTimerMain getMain = CombatTimerMain.getInstance();
        String title = CombatTimerMain.getInstance().title;
        if (getMain.hasCooldown(player.getName())) {
            if (!getMain.commands.contains(event.getMessage())
                    && event.getMessage().startsWith("/")) {
                if (!getMain.commands.contains(event.getMessage())
                        && event.getFormat().startsWith("/")) {
                    event.setCancelled(true);
                    player.sendMessage(title + ChatColor.RED
                            + "You cannot use commands in combat.");
                }
            }
        }
    }

EDIT: Forgot to show you how I was saving to a hashmap and such;

Code:

@Override
    public void onEnable() {
        saveDefaultConfig();
        initialiseConfig();
        getLogger().info("CombatTimer has been enabled.");
        getServer().getPluginManager().registerEvents(new CombatTimerEvents(),
                this);
        instance = this;
        commands.clear();
        commands.add(getConfig().getString("combattimer.allowedcommands"));
    }

    private void initialiseConfig() {
        FileConfiguration config = getConfig();

        config.addDefault("combattimer.cooldown", "");
        config.addDefault("combattimer.firstjoin.cooldown", "");
        config.addDefault("combattimer.allowedcommands", "");
        config.options().copyDefaults(true);
    }

    @Override
    public void onDisable() {
        getLogger().info("CombatTimer has been disabled.");
        saveConfig();
        instance = null;
        commands.clear();
    }

And the command to add the blocked commands:

Code:

 else if (args[0].equalsIgnoreCase("add") && player.isOp()) {
                if (args.length == 2) {
                    String newCommand = StringUtils.join(args, " ", 2,
                            args.length);
                    player.sendMessage(title + ChatColor.GRAY
                            + "You have allowed " + newCommand
                            + " to be used in combat.");
                    commands.add(newCommand);
                    getConfig().set("combattimer.allowedcommands", commands);
                    saveConfig();
                }

 

@Jomens235 PlayerCommandPreprocessEvent

 

PlayerCommandPreprocessEvent

 

@DJSkepter @Derpiee Thank you!