Handle object to access basic event type datasets in hdf5 formatted file with go4 event data. More...

#include <TGo4HDF5DataHandle.h>

Inheritance diagram for TGo4HDF5BasicDataHandle:

Public Member Functions
	TGo4HDF5BasicDataHandle (const char *name, size_t datasize)
	create new data handle
virtual	~TGo4HDF5BasicDataHandle ()
void	BuildReadDataset (H5::H5File file, TGo4HDF5Source parent) override
	create datasets and buffers for reading this structure from hdf5 file.
void	BuildWriteDataset (H5::H5File *file) override
	create datasets for writing memory structure of type into file.
void	Read (hsize_t sequencenum, H5::H5File *file) override
	Read event of sequence number from file.
void	Write (hsize_t sequencenum, H5::H5File *file) override
	Write event of sequence number from file.
Public Member Functions inherited from TGo4HDF5DataHandle
	TGo4HDF5DataHandle (const char *name, size_t datasize)
	create new data handle
virtual	~TGo4HDF5DataHandle ()
TGo4HDF5DataHandle *	AddSubMember (const char name, size_t datasize, const char collectiontype=nullptr)
	create new subhandle for complex member component on heap.
void *	Data () const
TGo4HDF5DataHandle *	FindSubMember (const char *name)
	lookup if subcomponent of name already is in list.
TGo4HDF5DataHandle *	GetSubMember (UInt_t ix)
H5::CompType *	GetType () const
	return handle for type descriptor.
const char *	GetTypeName () const
void	InsertTypeMember (const H5std_string &name, size_t offset, const H5::DataType &new_member)
	wrapper function to define contained structure member.
void	SetActive (Bool_t on)
void	SetAllSubMembersActive (Bool_t on)
void	SetMemberClass (const char *clname)
	type of the member to access from outside
void	SetMemberName (const char *name)
	identifier for the member to access from outside using the top event handle
virtual void	SetObjectPointer (void *memptr)
	define location of corresponding object in memory.
void	SetParentOffset (size_t off)
	remember location of this object relative to upper level object.
void	SetTopEvent (TGo4EventElement *eve)
	pass the top level event element down the member hierarchy.
void	SetTopEventClass (const char *classname)
	pass the top level event element class down the member hierarchy.

Protected Member Functions
void	AllocReadBuffer (size_t size)
	(Re-)allocate read buffer depending on the object size read from file

Protected Attributes
Char_t *	fxReadBuffer {nullptr}
	secondary read bounce buffer for hdf5
Protected Attributes inherited from TGo4HDF5DataHandle
Bool_t	fbDataSetActive {kFALSE}
	we may disable this dataset temporarily from writing or reading useful for dynamic vector of vector components
Bool_t	fbDataSetExists {kFALSE}
	check on the fly if this handle has already created a dataset
size_t	fiDataSize {0}
	size of data structure in bytes, for redefining output dataset
ULong_t	fiEntries {0}
	number of event entries found in file dataspace
size_t	fiParentOffset {0}
	offset of this data structure relative to top level event object
size_t	fiReadOffset {0}
	begin of real eventdata payload after event object pointer
void *	fxData {nullptr}
	pointer to begin of data in memory
H5::DataSet	fxDataSet
	dataset containing the structure
H5::DataSpace *	fxDataSpace {nullptr}
	dataspace in memory
TGo4EventElement *	fxEvent {nullptr}
	the top level event element to access the current data member from outside
TString	fxEventClass
	the top level event element classname to access the current data member from outside
H5::DataSpace	fxFileSpace
	dataspace in file
TString	fxMemberClass
	classname of the entry for interpreter to operate e.g.
TString	fxMemberHandle
	predefined interpreter access command e.g.
TGo4HDF5Source *	fxParentSource {nullptr}
	backpointer to parent source for exceptions
std::vector< TGo4HDF5DataHandle * >	fxSubcomponents
	collect sub-components of the referenced data object
H5::CompType *	fxType {nullptr}
	component type representing the data structure
TString	fxTypeName
	identifier of the dataset