Implement ranged queries

Summary:
Notes:

- For now, only for QDateTime indexes
- Invalid QDateTimes are stored in the index (subject to change)
- Should be a drop-in replacement from ValueIndexes (except for `In` and `Contains` queries)

Reviewers: cmollekopf

Tags: #sink

Differential Revision: https://phabricator.kde.org/D13105

1 files changed, 4 insertions, 0 deletions

diff --git a/common/index.h b/common/index.h
index f16a426..043cc90 100644
--- a/common/index.h
+++ b/common/index.h
@@ -40,6 +40,10 @@ public:
         bool matchSubStringKeys = false);
     QByteArray lookup(const QByteArray &key);
 
+    void rangeLookup(const QByteArray &lowerBound, const QByteArray &upperBound,
+        const std::function<void(const QByteArray &value)> &resultHandler,
+        const std::function<void(const Error &error)> &errorHandler);
+
 private:
     Q_DISABLE_COPY(Index);
     Sink::Storage::DataStore::Transaction mTransaction;