observe_error.h

#ifndef  OBSERVE_ERROR_H
#define OBSERVE_ERROR_H

#include <string>
#include <vtkCommand.h>

class ErrorObserver : public vtkCommand
{
public:
	ErrorObserver() :
		Error(false),
		Warning(false),
		ErrorMessage(""),
		WarningMessage("") {}
	static ErrorObserver *New()
	{
		return new ErrorObserver;
	}
	bool GetError() const
	{
		return this->Error;
	}
	bool GetWarning() const
	{
		return this->Warning;
	}
	void Clear()
	{
		this->Error = false;
		this->Warning = false;
		this->ErrorMessage = "";
		this->WarningMessage = "";
	}
	virtual void Execute(vtkObject *vtkNotUsed(caller),
		unsigned long event,
		void *calldata)
	{
		switch (event)
		{
		case vtkCommand::ErrorEvent:
			ErrorMessage = static_cast<char *>(calldata);
			this->Error = true;
			break;
		case vtkCommand::WarningEvent:
			WarningMessage = static_cast<char *>(calldata);
			this->Warning = true;
			break;
		}
	}
	std::string GetErrorMessage()
	{
		return ErrorMessage;
	}
	std::string GetWarningMessage()
	{
		return WarningMessage;
	}
private:
	bool        Error;
	bool        Warning;
	std::string ErrorMessage;
	std::string WarningMessage;
};

#endif // ! OBSERVE_ERROR_H