[xwiki-users] Looking for these xwiki java API'S or java class containing these functionality?

Hi Folks, I am looking for three xwiki java api's that do the following functionality 1) I give the space name to api and it creates the space with default home page . 2)I give userName,SpaceName and rightsName(like view,edit,delete,admin) to api and it gives these rights on given space name for the given username 3)I give spaceName to api and it gives me whether the given space exists or not? I was looking for three apis in classes ---com.xpn.xwiki.xwiki.java and com.xpn.xwiki.api.xwiki.java but i could not locate these. But i am sure these api's must be existing (as user is able to do these stuff from user interface). I will be grateful if i can be directed to these apis? Thanks in advance.