public List<Friend> getAllFriends() {
try {
// TODO In some cases cache the data is the best practice.
List<Friend> fl = dao.getAllFriends();
return fl;
} catch (Exception e) {
// in case of error, return empty list.
return new ArrayList<Friend>();
}
}
/*
* Add friend to the data source.
*/
public void addFriend(Friend f) {
try {
// add the friend to the data base and use the returned friend and add it ti the local cache.
// the friend that returned from the DAO contain the id of the entity.
Friend retFriend = dao.addFriend(f);
if (retFriend == null) return;
// update what ever it will be.
invokeDataSourceChanged();
} catch (Exception e) {
Log.e("MainController", e.getMessage());
}
}
/*
* remove friend from the data source.
*
*/
public void removeFriend(Friend f) {
// remove the friend from the database.
dao.removeFriend(f);
invokeDataSourceChanged();
}