How can I check for the presence of a permissions plugin

I'm making a plugin and I want this: everyone has permission to use a specific command if no permissions plugin is installed, but if it is, then noone has permission to use the command unless they have a permission node.
Currently, everyone has the permission unless they have a negative node (-myplugin.use). Here's my code:

plugin.yml (open) plugin.yml (close)

Code:

...

permissions:
  myplugin.use:
    default: true

...

Command code (open) Command code (close)

Code:

...

if (!p.hasPermission("styletp.use")) {
        p.sendMessage(noPermission);
        return true;
}

...

How can I make it so that if no permissions plugin is present, then anyone can use the command, but if there is a permissions plugin installed, then players need to have the permission node to use the command?

 

You need to install any permission plugin, like pex or group manager. Else you cant set the permissions to any player.

 

@CostelabrMn That's not what I'm trying to say. I'm trying to make the plugin allow any player to run the command if a permissions plugin is not installed, but require the permission node if a permissions plugin is installed.

 

Use JavaPlugin's methods to test if a certain plugin is installed.

 

There is a method that you can use, but you need to know the main class name of the plugin

Code:java

Bukkit.getServer().getPluginManager().getPlugin("Name");

 

Thanks to everyone, it looks like I'm going to have to find a different way.

 

@marti.2001

Just a thought, might be completely wrong, but doesn't Vault have a method for this? It seems
like a vault thing..

 

Theres always a permission "plugin". Bukkit has a default permission system.