QVersitContactExporter Class Reference

Exporting group relationships

The exporter does not handle QContactRelationships at all.

Some managers use the HasMember QContactRelationship along with contacts of type TypeGroup to indicate categorization of contacts. In vCard, categorization is represented by the CATEGORIES property, which has semantics most similar to the QContactTag detail. For contact manager backends that supports groups but not QContactTag, if the categorization information needs to be retained through CATEGORIES vCard properties, extra work can be done to convert from group relationships to QContactTag before passing the contact list to the exporter. Below is some example code that does this translation.

 /*! Adds QContactTag details to the \a contacts, based on the \a relationships.

   Tags are created such that if a group contact, B with display label "b", has a HasMember
   relationship with a contact, A, then a QContactTag, "b", is added to A.

   Group contacts can be passed in with the \a contacts list.  If a contact is part of a group which
   is not in \a contacts, the \a manager is queried to find them.
   */
 void createTagsFromGroups(QList<QContact>* contacts,
                           const QList<QContactRelationship>& relationships,
                           const QContactManager* manager)
 {
     // Map from QContactIds to group names
     QMap<QContactId, QString> groupMap;

     // Map from QContactIds to indices into the contacts list
     QMap<QContactId, int> indexMap;
     // Build up groupMap and indexMap
     for (int i = 0; i < contacts->size(); ++i) {
         QContact contact = contacts->at(i);
         if (contact.type() == QContactType::TypeGroup) {
             // In practice, you may want to check that there aren't two distinct groups with the
             // same name, and you may want to use a field other than display label.
             groupMap.insert(contact.id(), contact.displayLabel());
         }
         indexMap.insert(contact.id(), i);
     }

     // Now add all the tags specified by the group relationships
     foreach (const QContactRelationship& rel, relationships) {
         if (rel.relationshipType() == QContactRelationship::HasMember
             && indexMap.contains(rel.second())) {
             QString groupName = groupMap.value(rel.first()); // Have we seen the group before?
             if (groupName.isEmpty()) {
                 // Try and find the group in the manager
                 QContactId groupId = rel.second();
                 QContactFetchHint fetchHint;
                 fetchHint.setDetailDefinitionsHint(QStringList(QContactDisplayLabel::DefinitionName));
                 QContact contact = manager->contact(groupId.localId(), fetchHint);
                 if (!contact.isEmpty()) {
                     groupName = contact.displayLabel();
                     groupMap.insert(groupId, groupName); // Cache the group id/name
                 }
             }
             if (!groupName.isEmpty()) {
                 // Add the tag
                 QContactTag tag;
                 tag.setTag(groupName);
                 (*contacts)[indexMap.value(rel.second())].saveDetail(&tag);
             }
         }
     }
 }