A class representing an HDF5 data type. More...

#include <HDF5DataType.h>

Public Member Functions
	HDF5DataType ()
	The default constructor makes an invalid object. More...

	HDF5DataType (const Bool *)
	Create an HDF5 datatype object for the given fixed length type. More...

	HDF5DataType (const uChar *)

	HDF5DataType (const Short *)

	HDF5DataType (const uShort *)

	HDF5DataType (const Int *)

	HDF5DataType (const uInt *)

	HDF5DataType (const Int64 *)

	HDF5DataType (const Float *)

	HDF5DataType (const Double *)

	HDF5DataType (const Complex *)

	HDF5DataType (const DComplex *)

	HDF5DataType (const String *)

	HDF5DataType (const String &value)
	Create an HDF5 datatype object for a scalar string. More...

	HDF5DataType (Int, Int)
	Create an HDF5 datatype object for an empty array. More...

	HDF5DataType (const std::vector< String > &names, const std::vector< HDF5DataType > &types)
	Define a compound data type consisting of the given fields and types. More...

	HDF5DataType (const HDF5DataType &, const IPosition &shape)
	Create an array of the given data type. More...

	HDF5DataType (const HDF5DataType &that)
	The copy constructor makes a deep copy. More...

	~HDF5DataType ()
	The destructor closes the HDF5 data type object. More...

HDF5DataType &	operator= (const HDF5DataType &that)
	Assignment makes a deep copy. More...

hid_t	getHidMem () const
	Get the HID for the data type in memory. More...

hid_t	getHidFile () const
	Get the HID for the data type in the file. More...

uInt	size () const
	Get the size in bytes of the data type (in memory). More...

Static Public Member Functions
static DataType	getDataType (hid_t)
	Get the Casacore data type for the given HDF5 data type. More...

static Bool	isComplex (hid_t dtid)
	Test if the data type is Complex or DComplex. More...

static Bool	isEmptyArray (hid_t dtid)
	Test if the data type is an empty array. More...

static IPosition	getShape (hid_t dtid)
	Get the shape of an array data type. More...

static Block< hsize_t >	fromShape (const IPosition &shape)
	Helper functions to convert shapes. More...

static IPosition	toShape (const Block< hsize_t > &b)

Private Member Functions
void	addToCompound (const char *name, uInt offset, const HDF5DataType &dtype)
	Add a field to a compound data type. More...

Private Attributes
HDF5HidDataType	itsHidMem

HDF5HidDataType	itsHidFile

uInt	itsSize

Detailed Description

A class representing an HDF5 data type.

Intended use:

Internal

Review Status

Test programs:: tHDF5DataType

Prerequisite

HDF5 system

Synopsis

This class wraps the HDF5 functions to create a data type for the data in memory and for the file. The HDF5 file data type order is set to LittleEndian.
The basic constructors define a scalar of a basic data type or data type Complex and DComplex. Strings are also supported. However, it is also possible to define a fixed shaped array for any HDF5DataType. Furthermore, it is possible to define a compound data type consisting of named fields of any HDF5DataType with a fixed size. Arrays and/or compounds can be nested at will.
Variable length strings are supported, but cannot be used in compounds.
Older HDF5 versions did not support empty arrays. Therefore they are represented as a compound with 3 fields. Also they did not support boolean values; they are represented as a signed char. HDF5 does not support complex values either. They are represented as a compound with fields 're' and 'im'.

Motivation

The HDF5 C++ interface only supports the HDF5 C functionality and resembles that to much. For instance, it does not use STL containers. It does not support non-basic data types, in particular Complex.

Definition at line 86 of file HDF5DataType.h.

Constructor & Destructor Documentation

casacore::HDF5DataType::HDF5DataType ( )

inline

The default constructor makes an invalid object.

It is needed to make a vector of objects.

Definition at line 91 of file HDF5DataType.h.

casacore::HDF5DataType::HDF5DataType ( const Bool * )

explicit

Create an HDF5 datatype object for the given fixed length type.

It uses the corresponding native HDF5 data type. Only for Bool it uses a uchar, because the HDF5 bool type is a uint. For the complex types it makes a compound HDF5 data type. The String type is meant for an array of strings.

casacore::HDF5DataType::HDF5DataType ( const uChar * )

explicit

casacore::HDF5DataType::HDF5DataType ( const Short * )

explicit

casacore::HDF5DataType::HDF5DataType ( const uShort * )

explicit

casacore::HDF5DataType::HDF5DataType ( const Int * )

explicit

casacore::HDF5DataType::HDF5DataType ( const uInt * )

explicit

casacore::HDF5DataType::HDF5DataType ( const Int64 * )

explicit

casacore::HDF5DataType::HDF5DataType ( const Float * )

explicit

casacore::HDF5DataType::HDF5DataType ( const Double * )

explicit

casacore::HDF5DataType::HDF5DataType ( const Complex * )

explicit

casacore::HDF5DataType::HDF5DataType ( const DComplex * )

explicit

casacore::HDF5DataType::HDF5DataType ( const String * )

explicit

casacore::HDF5DataType::HDF5DataType ( const String & value )

explicit

Create an HDF5 datatype object for a scalar string.

The length of the string is part of the type.

casacore::HDF5DataType::HDF5DataType	(	Int	,
		Int
	)

Create an HDF5 datatype object for an empty array.

Both arguments are dummy (needed to distinguish the constructor). An empty array as represented as a compound data type with integer field names emptyarray, rank and casatype.

casacore::HDF5DataType::HDF5DataType	(	const std::vector< String > &	names,
		const std::vector< HDF5DataType > &	types
	)

Define a compound data type consisting of the given fields and types.

An exception is thrown if the vectors are empty or have mismatching sizes.

casacore::HDF5DataType::HDF5DataType	(	const HDF5DataType &	,
		const IPosition &	shape
	)

Create an array of the given data type.

An exception is thrown if the shape is empty.

casacore::HDF5DataType::HDF5DataType ( const HDF5DataType & that )

The copy constructor makes a deep copy.

casacore::HDF5DataType::~HDF5DataType ( )

The destructor closes the HDF5 data type object.

Member Function Documentation

void casacore::HDF5DataType::addToCompound	(	const char *	name,
		uInt	offset,
		const HDF5DataType &	dtype
	)

private

Add a field to a compound data type.

It does it for the memory and file data type.

static Block<hsize_t> casacore::HDF5DataType::fromShape ( const IPosition & shape )

static

Helper functions to convert shapes.

It reverses the axes, because HDF5 uses C-order.

static DataType casacore::HDF5DataType::getDataType ( hid_t )

static

Get the Casacore data type for the given HDF5 data type.

TpRecord is returned for a compound data type.

hid_t casacore::HDF5DataType::getHidFile ( ) const

inline

Get the HID for the data type in the file.

Definition at line 153 of file HDF5DataType.h.

References itsHidFile.

hid_t casacore::HDF5DataType::getHidMem ( ) const

inline

Get the HID for the data type in memory.

Definition at line 149 of file HDF5DataType.h.

References itsHidMem.

static IPosition casacore::HDF5DataType::getShape ( hid_t dtid )

static

Get the shape of an array data type.

It returns an empty IPosition for non-arrays.

static Bool casacore::HDF5DataType::isComplex ( hid_t dtid )

static

Test if the data type is Complex or DComplex.

static Bool casacore::HDF5DataType::isEmptyArray ( hid_t dtid )

static

Test if the data type is an empty array.

HDF5DataType& casacore::HDF5DataType::operator= ( const HDF5DataType & that )

Assignment makes a deep copy.

uInt casacore::HDF5DataType::size ( ) const

inline

Get the size in bytes of the data type (in memory).

Note that the size of a string is variable, thus 0.

Definition at line 158 of file HDF5DataType.h.

References itsSize.

static IPosition casacore::HDF5DataType::toShape ( const Block< hsize_t > & b )

static

Member Data Documentation

HDF5HidDataType casacore::HDF5DataType::itsHidFile

private

Definition at line 187 of file HDF5DataType.h.

Referenced by getHidFile().

HDF5HidDataType casacore::HDF5DataType::itsHidMem

private

Definition at line 186 of file HDF5DataType.h.

Referenced by getHidMem().

uInt casacore::HDF5DataType::itsSize

private

Definition at line 188 of file HDF5DataType.h.

Referenced by size().

The documentation for this class was generated from the following file:

casa/HDF5/HDF5DataType.h

Public Member Functions

Static Public Member Functions

Private Member Functions

Private Attributes

Detailed Description

Intended use:

Review Status

Prerequisite

Synopsis

Motivation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation