Add a pagination API

Makefile.am

@@ -37,6 +37,7 @@ libmedialibrary_la_HEADERS = \
 	include/medialibrary/Types.h \
 	include/medialibrary/IDeviceLister.h \
 	include/medialibrary/IFolder.h \
+	include/medialibrary/IQuery.h \
 	$(NULL)
 
 libmedialibrary_la_SOURCES = \

include/medialibrary/IQuery.h

+/*****************************************************************************
+ * Media Library
+ *****************************************************************************
+ * Copyright (C) 2015 Hugo Beauzée-Luyssen, Videolabs
+ *
+ * Authors: Hugo Beauzée-Luyssen<hugo@beauzee.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#pragma once
+
+#include <vector>
+#include <memory>
+
+namespace medialibrary
+{
+
+template <typename T>
+class IQuery
+{
+public:
+    using Result = std::vector<std::shared_ptr<T>>;
+
+    virtual ~IQuery() = default;
+    virtual size_t count() = 0;
+    virtual Result items( uint32_t nbItems,  uint32_t offset ) = 0;
+    virtual Result all() = 0;
+};
+
+template <typename T>
+using Query = std::unique_ptr<IQuery<T>>;
+
+}