refs #199 , context base class to simplify handling

* usingLocalObjects() now derived from runtime config, no need to override it in contexts
* getRuntime in base class, no longer to implement it in each context class

src/blackcore/context.h

@@ -0,0 +1,49 @@
+#ifndef BLACKCORE_CONTEXT_H
+#define BLACKCORE_CONTEXT_H
+
+#include <QObject>
+#include "blackcore/context_runtime_config.h"
+#include "blackcore/context_runtime.h"
+
+namespace BlackCore
+{
+    /*!
+     * \brief Base for all context classes
+     */
+    class CContext : public QObject
+    {
+    private:
+        CRuntimeConfig::ContextMode m_mode;
+
+    public:
+        //! Destructor
+        ~CContext() {}
+
+        //! Using local objects?
+        bool usingLocalObjects() const
+        {
+            return m_mode == CRuntimeConfig::Local || m_mode == CRuntimeConfig::LocalInDbusServer;
+        }
+
+        //! Runtime
+        CRuntime *getRuntime()
+        {
+            Q_ASSERT(this->parent());
+            return static_cast<CRuntime *>(this->parent());
+        }
+
+        //! Const runtime
+        const CRuntime *getRuntime() const
+        {
+            Q_ASSERT(this->parent());
+            return static_cast<CRuntime *>(this->parent());
+        }
+
+    protected:
+        //! Constructor
+        CContext(CRuntimeConfig::ContextMode mode, QObject *parent) : QObject(parent), m_mode(mode)
+        {}
+
+    };
+}
+#endif // guard