class CEventFilter : public CEventSink {
protected:
Bool_t m_fEnabled;
std::string m_sFileName;
std::vector<std::string> m_vParameterNames;
std::vector<UInt_t> m_vParameterIds;
CFilterOutputStage* m_pOutput;
public:
CEventFilter(std::string& rFileName);
std::vector<std::string> getParameterNames() const;
std::vector<UInt_t> getParameterIds() const;
Bool_t CheckEnabled() const;
std::string getFileName() const;
CFilterOutputStage* getOutputStream();
void setParameterNames(const std::vector<std::string>& names);
void setOutputStream(CFilterOutputStage* str);
void Enable();
void Disable();
void setFileName(std::string&);
void setOutputFormat(CFilterOutputStage* format);
std::string outputFormat() const;
virtual void operator()(CEventList& rEvents);
virtual void operator()(CEvent& rEvent);
protected:
virtual Bool_t CheckCondition(CEvent& rEvent) = 0;
static std::string DefaultFilterFilename();
void NamesToIds();
std::vector<std::string> IdsToNames()
};
Filters are objects that, since they are derived from
CEventSink, can be added to the
event sink pipeline. Filters are expected to operate on
decoded events. They have:
A file to which output data are written
A list of parameters that will be output.
A condition that determines which events are written
A formatting object that determines how the events are written to the output file.
Thus filters create subsets of the raw input data. The output of filters both subset the events (writing only those events that satisfy their condition), and the parameters (writing only the specified parameters).
Filters can speed up subsequent event processing both by reducing the volume of data produced and by writing data in a format much easier to decode than the original raw event data. People using filters have reported over an order of magnitude improvement in the processing of e.g. XDR formatted filtered data over raw data, even when no selection has been performed.
CEventFilter(std::string& rFileName);
Constructor. rFilename references
the name of the file that filtered data will be written
into. The file is not opened by the constructor.
); std::vector<std::string> getParameterNames() const; std::vector<UInt_t> getParameterIds() const; Bool_t CheckEnabled() const; std::string getFileName() const; CFilterOutputStage* getOutputStream(); void setParameterNames(const std::vector<std::string>& names); void setOutputStream(CFilterOutputStage* str); void Enable(); void Disable(); void setFileName(std::string&); void setOutputFormat(CFilterOutputStage* format); std::string outputFormat() const; virtual void operator()(CEventList& rEvents); virtual void operator()(CEvent& rEvent); protected: virtual Bool_t CheckCondition(CEvent& rEvent) = 0; static std::string DefaultFilterFilename(); void NamesToIds(); std::vector<std::string> IdsToNames()