cxErrorObserver.h

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#ifndef CXERROROBSERVER_H
#define CXERROROBSERVER_H
 
#include "cxResourceExport.h"
 
#include "boost/shared_ptr.hpp"
#include <vtkCommand.h>
#include <vtkSmartPointer.h>
#include <vtkAlgorithm.h>
#include <QString>
#include "cxLogger.h"
#include <QMutex>
 
namespace cx {
 
class cxResource_EXPORT StaticMutexVtkLocker
{
public:
        StaticMutexVtkLocker();
        ~StaticMutexVtkLocker();
private:
        static boost::shared_ptr<QMutex> mMutex;
};
 
 
//---------------------------------------------------------
class cxResource_EXPORT ErrorObserver: public vtkCommand
{
public:
        ErrorObserver()
        {
        }
        static ErrorObserver* New()
        {
                return new ErrorObserver;
        }
        virtual void Execute(vtkObject* caller, unsigned long, void* text)
        {
                mMessage = QString(reinterpret_cast<char*> (text));
        }
        QString mMessage;
 
        static bool checkedRead(vtkSmartPointer<vtkAlgorithm> reader, QString filename)
        {
                vtkSmartPointer<ErrorObserver> errorObserver = vtkSmartPointer<ErrorObserver>::New();
                reader->AddObserver("ErrorEvent", errorObserver);
 
                {
                        StaticMutexVtkLocker lock;
                        reader->Update();
                }
//              ErrorObserver::threadSafeUpdate(reader);
 
                if (!errorObserver->mMessage.isEmpty())
                {
                        reportError("Load of data [" + filename + "] failed with message:\n"
                                + errorObserver->mMessage);
                        return false;
                }
                return true;
        }
};
 
}
 
#endif // CXERROROBSERVER_H