refs #445, encapsulated web service based reading in CWebDataReader

* the reader will be used in context, but can also be used standalone (ie mapping GUI) GUI
* adjustments in context/airspace as required
** for web reader
** livery
* base class for database based reading (via JSON/web)
* model data reader for models

src/blackcore/databasereader.h

@@ -0,0 +1,45 @@
+/* Copyright (C) 2015
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+#ifndef BLACKCORE_DATABASE_READER_H
+#define BLACKCORE_DATABASE_READER_H
+
+//! \file
+
+#include "blackcore/blackcoreexport.h"
+#include "blackmisc/threadedreader.h"
+#include <QNetworkReply>
+#include <QJsonArray>
+
+namespace BlackCore
+{
+    //! Support for threaded based reading and parsing tasks such
+    //! as data files via http, or file system and parsing (such as FSX models)
+    class BLACKCORE_EXPORT CDatabaseReader : public BlackMisc::CThreadedReader
+    {
+        Q_OBJECT
+
+    public:
+        //! Start reading in own thread
+        void readInBackgroundThread();
+
+    protected:
+        //! Constructor
+        CDatabaseReader(QObject *owner, const QString &name);
+
+        //! Check if terminated or error, otherwise split into array of objects
+        QJsonArray transformReplyIntoJsonArray(QNetworkReply *nwReply) const;
+
+        //! Build service URL
+        static QString buildUrl(const QString &protocol, const QString &server, const QString &baseUrl, const QString &serviceUrl);
+
+    };
+} // namespace
+
+#endif // guard