View source for How to implement actions in your code

==Permissions==
Permissions for actions can have values “Null”, ‘0’ and ‘1’
* Null is equivalent of Not Set or Inherited and as such implicitly Denied (“Not Allowed” in Debug Permissions Report).
* 0 is equivalent to Explicitly Denied (“Forbidden” in Debug Permissions Report).
* 1 is equivalent to Allowed (“Allowed” in Debug Permissions Report).

Inheritance makes that if an action is explicitly denied in a higher level it always is denied for all the children no matter what their setting is. Also, if an action is allowed, it is allowed for all the children unless it is explicitly denied for one of them (and therefore for its children as well). And finaly, if an action is not set nor inherited (and the parents are not explicitly denied nor allowed) then it is implicitly denied.

You can check if the logged in user has permission for an action for a specific asset:
<source lang="php">
JFactory::getUser()->authorise('core.admin','com_mycomponent')
</source>
for action core.admin and asset com_mycomponent ([[API16:JUser/authorise]]).