Solved How to get the default gamemode for world?

Writing a plugin and I need to get what the default gamemode is for a world, is this possible in "vanilla"? What method would I use to get it? (tried searching for ~1h but didn't find the answer :/ )

Perhaps this is only possible if one uses something like multiverse? (What method?)
...but on a single world server surely it should be possible somehow even in vanilla? (What method?)

(Just to avoid confusion: I'm writing code, I want methods / docs, not chat-commands!)

 

so there is Server.getDefaultGameMode () but not sure how that works for a world.
Can you even have more than one world in vanilla bukkit?

 

Thanks for the info @qhenckel Will give it some thought and possibly look more at Multiverse.

I want to mark this as solved, so fleshing out the answer a bit for multiverse.
These links (in this order) should get you going:
*there might be a better way, and I haven't actually tested this so please comment if it's wrong

https://forums.bukkit.org/threads/multiverse-worldmanager-api.94746/

** http://ci.onarandombox.com/job/Multiverse-Core/doxygen/ **
http://ci.onarandombox.com/job/Mult...1_core.html#a287282eac64a69fcdbb045ad2197266a
http://ci.onarandombox.com/job/Mult...ltiverse_core_1_1utils_1_1_world_manager.html
http://ci.onarandombox.com/job/Mult...anager.html#af107eb71ed725506fc50af8de7335a84
(try cast to...)
http://ci.onarandombox.com/job/Mult...dombox_1_1_multiverse_core_1_1_m_v_world.html
http://ci.onarandombox.com/job/Mult..._world.html#a11af450ecf6cdf213197535457ea9fbc

(because documentation links are better than actual code in my opinion)

EDIT by Moderator: merged posts, please use the edit button instead of double posting.