Introducing StorageLocations in QtContacts.

This commit introduces a concept of StorageLocation in QtContacts QML
and C++ interfaces. This concept enables QContacts to be stored in two
different storage locations, namely UserDataStorage and SystemStorage.
Commit includes also jsondb backend support for storage locations
as well as test cases for QML and C++ interfaces.

There are some limitations in using storage locations.
- Contacts QML model can deal with one storage location at the time.
- In C++ interface fetching can be done only from one storage location
  at a time.
  - Thus fetching from two different storage location requires two
    fetch requests.
- Synchronous operations in C++ interface only supports the default
  storage location.
- It is completely backend specific if and how storage locations are
  supported.
  - Currently jsondb backend supports storage locations with default
    storage location being UserDataStorage.

C++ tests for storage locations were implemented by
  Mika Tikkakoski <mika.tikkakoski@nokia.com>

Storage location implementation contain contributions by
  Claudio Brunelli <claudio.brunelli@nokia.com>
  Cristiano di Flora <cristiano.di-flora@nokia.com>
  Mika Tikkakoski <mika.tikkakoski@nokia.com>

Change-Id: I4e8d05ccd88371ecd6c9a33a66a6d4bab762be3d
Reviewed-by: Cristiano di Flora <cristiano.di-flora@nokia.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/contacts/qcontactmanagerengine.h b/src/contacts/qcontactmanagerengine.h
index 9d7b2ec36..a55043dd8 100644
--- a/src/contacts/qcontactmanagerengine.h
+++ b/src/contacts/qcontactmanagerengine.h
@@ -141,6 +141,7 @@ public:
     static void setContactRelationships(QContact *contact, const QList<QContactRelationship> &relationships);
 
     /* Helper functions */
+    static const QContactEngineId *engineId(const QContactId &contactId);
     static int compareContact(const QContact &a, const QContact &b, const QList<QContactSortOrder> &sortOrders);
     static void addSorted(QList<QContact>* sorted, const QContact &toAdd, const QList<QContactSortOrder> &sortOrders);
     static int compareVariant(const QVariant &first, const QVariant &second, Qt::CaseSensitivity sensitivity);