From a0f2a168f943b28fbe5c7a7afdd3ff3af3d58014 Mon Sep 17 00:00:00 2001
From: Klaus Basan <klaus.basan@klausbasan.de>
Date: Wed, 3 May 2017 02:07:17 +0200
Subject: [PATCH] Ref T28, utility functions to get timestamps

---
 src/blackmisc/db/datastoreobjectlist.cpp | 18 ++++++++++++++++++
 src/blackmisc/db/datastoreobjectlist.h   |  6 ++++++
 2 files changed, 24 insertions(+)

diff --git a/src/blackmisc/db/datastoreobjectlist.cpp b/src/blackmisc/db/datastoreobjectlist.cpp
index 42eac5540..d3ac892d0 100644
--- a/src/blackmisc/db/datastoreobjectlist.cpp
+++ b/src/blackmisc/db/datastoreobjectlist.cpp
@@ -142,6 +142,24 @@ namespace BlackMisc
             return newValues.size() - removeSize;
         }
 
+        template<class OBJ, class CONTAINER, typename KEYTYPE>
+        QDateTime IDatastoreObjectList<OBJ, CONTAINER, KEYTYPE>::oldestDbTimestamp() const
+        {
+            CONTAINER objs(this->container());
+            objs.removeObjectsWithoutDbKey();
+            if (objs.isEmpty()) { return QDateTime(); }
+            return objs.oldestDbTimestamp();
+        }
+
+        template<class OBJ, class CONTAINER, typename KEYTYPE>
+        QDateTime IDatastoreObjectList<OBJ, CONTAINER, KEYTYPE>::latestDbTimestamp() const
+        {
+            CONTAINER objs(this->container());
+            objs.removeObjectsWithoutDbKey();
+            if (objs.isEmpty()) { return QDateTime(); }
+            return objs.latestTimestamp();
+        }
+
         template <class OBJ, class CONTAINER, typename KEYTYPE>
         CONTAINER IDatastoreObjectList<OBJ, CONTAINER, KEYTYPE>::fromDatabaseJson(const QJsonArray &array)
         {
diff --git a/src/blackmisc/db/datastoreobjectlist.h b/src/blackmisc/db/datastoreobjectlist.h
index bf1000d44..32604f2da 100644
--- a/src/blackmisc/db/datastoreobjectlist.h
+++ b/src/blackmisc/db/datastoreobjectlist.h
@@ -50,6 +50,12 @@ namespace BlackMisc
             //! Update or insert data (based on DB key)
             int replaceOrAddObjectsByKey(const CONTAINER &container);
 
+            //! Latest DB timestamp (means objects with DB key)
+            QDateTime latestDbTimestamp() const;
+
+            //! Latest DB timestamp (means objects with DB key)
+            QDateTime oldestDbTimestamp() const;
+
             //! From DB JSON with default prefixes
             static CONTAINER fromDatabaseJson(const QJsonArray &array);