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Improve Roster documentation (roster.md)

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Florian Schmaus 2018-10-31 19:55:49 +01:00
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documentation/roster.md
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@ -10,12 +10,16 @@ list, contact list, etc.
A `Roster` instance is obtained using the `Roster.getInstanceFor(XMPPConnection)` method. A `Roster` instance is obtained using the `Roster.getInstanceFor(XMPPConnection)` method.
A detailed descriptrion of the protcol behind the Roster and Presence
semantics can be found in [RFC
6120](https://tools.ietf.org/html/rfc6121).
Roster Entries Roster Entries
-------------- --------------
Every user in a roster is represented by a RosterEntry, which consists of: Every user in a roster is represented by a RosterEntry, which consists of:
* An XMPP address (e.g. jsmith@example.com). * An XMPP address, aka. JID (e.g. jsmith@example.com).
* A name you've assigned to the user (e.g. "Joe"). * A name you've assigned to the user (e.g. "Joe").
* The list of groups in the roster that the entry belongs to. If the roster entry belongs to no groups, it's called an "unfiled entry". The following code snippet prints all entries in the roster: * The list of groups in the roster that the entry belongs to. If the roster entry belongs to no groups, it's called an "unfiled entry". The following code snippet prints all entries in the roster:
@ -35,11 +39,12 @@ Presence
![Roster](images/roster.png) ![Roster](images/roster.png)
Every entry in the roster has presence associated with it. The Every entry in the roster has presence associated with it. The
`Roster.getPresence(String user)` method will return a Presence object with `Roster.getPresence(BareJid user)` method will return a Presence object with
the user's presence or `null` if the user is not online or you are not the user's presence or `null` if the user is not online or you are not
subscribed to the user's presence. _Note:_ typically, presence subscription is subscribed to the user's presence. _Note:_ Presence subscription is
always tied to the user being on the roster, but this is not true in all nnot tied to the user being on the roster, and vice versa: You could
cases. be subscriped to a remote users presence without the user in your roster, and
a remote user can be in your roster without any presence subscription relation.
A user either has a presence of online or offline. When a user is online, A user either has a presence of online or offline. When a user is online,
their presence may contain extended information such as what they are their presence may contain extended information such as what they are
@ -74,18 +79,20 @@ roster.addRosterListener(new RosterListener() {
}); });
``` ```
Note that in order to receive presence changed events you need to be subscribed
to the users presence. See the following section.
Adding Entries to the Roster Adding Entries to the Roster
---------------------------- ----------------------------
Rosters and presence use a permissions-based model where users must give Rosters and presence use a permissions-based model where users must give
permission before they are added to someone else's roster. This protects a permission before someone else can see their presence. This protects a
user's privacy by making sure that only approved users are able to view their user's privacy by making sure that only approved users are able to view their
presence information. Therefore, when you add a new roster entry it will be in presence information. Therefore, when you add a new roster entry, you will not
a pending state until the other user accepts your request. see the presence information until the other user accepts your request.
If another user requests a presence subscription so they can add you to their If another user requests a presence subscription, you must accept or reject
roster, you must accept or reject that request. Smack handles presence that request. Smack handles presence subscription requests in one of three ways:
subscription requests in one of three ways:
* Automatically accept all presence subscription requests. * Automatically accept all presence subscription requests.
* Automatically reject all presence subscription requests. * Automatically reject all presence subscription requests.