/**
* Initializes a new database cursor
*
* @param collection collection to use
* @param q query to perform
* @param k keys to return from the query
* @param preference the Read Preference for this query
*/
public DBCursor(DBCollection collection, DBObject q, DBObject k, ReadPreference preference) {
_collection = collection;
_query = q == null ? new BasicDBObject() : q;
_keysWanted = k;
if (_collection != null) {
_options = _collection.getOptions();
}
_readPref = preference;
_decoderFact = collection.getDBDecoderFactory();
}
