private net.minecraft.command.ICommandSender getListener(CommandSender sender) {
    if (sender instanceof Player) {
        return ((CraftPlayer) sender).getHandle();
    }
    if (sender instanceof BlockCommandSender) {
        return ((CraftBlockCommandSender) sender).getTileEntity();
    }
    if (sender instanceof CommandMinecart) {
        return ((net.minecraft.entity.EntityMinecartCommandBlock) ((CraftMinecartCommand) sender).getHandle()).func_145822_e();
    }
    if (sender instanceof RemoteConsoleCommandSender) {
        return net.minecraft.network.rcon.RConConsoleSource.instance;
    }
    if (sender instanceof ConsoleCommandSender) {
        return ((CraftServer) sender.getServer()).getServer();
    }
    return null;
}
 

@Override
public synchronized void start() {
    if (sender instanceof RemoteConsoleCommandSender) {
        run();
    } else {
        super.start();
    }
}
 

@Override
protected void sendMessage(CommandSender sender, String s) {
    // we can safely send async for players and the console
    if (sender instanceof Player || sender instanceof ConsoleCommandSender || sender instanceof RemoteConsoleCommandSender) {
        sender.sendMessage(s);
        return;
    }

    // otherwise, send the message sync
    getPlugin().getBootstrap().getScheduler().executeSync(new SyncMessengerAgent(sender, s));
}
 

public boolean isValidSender(CommandSender sender) {
	switch (this) {
	case PLAYER_ONLY:
		return (sender instanceof Player);
	case NO_PLAYER:
		return (sender instanceof ConsoleCommandSender || sender instanceof RemoteConsoleCommandSender || sender instanceof BlockCommandSender);
	case CONSOLE_ONLY:
		return (sender instanceof ConsoleCommandSender || sender instanceof RemoteConsoleCommandSender);
	case BLOCK_ONLY:
		return (sender instanceof BlockCommandSender);
	case DEFAULT:
		return true;
	}
	return false;
}