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CCfits::ExtHDU Class Reference

base class for all FITS extension HDUs, i.e. Image Extensions and Tables. More...

#include <ExtHDU.h>

Inheritance diagram for CCfits::ExtHDU::

Inheritance diagram
CCfits::HDU CCfits::Table CCfits::AsciiTable CCfits::BinTable List of all members.

Public Methods

 ExtHDU (const ExtHDU &right)
virtual ~ExtHDU ()
virtual void readData (bool readFlag=false, const std::vector< string > &keys=std::vector< string >())=0
const string& name () const
virtual HDUclone (FITSBase *p) const=0
virtual void makeThisCurrent () const
virtual Columncolumn (const string &colName) const
virtual Columncolumn (int colIndex) const
virtual long rows () const
virtual void addColumn (ValueType type, const string &columnName, long repeatWidth, const string &colUnit=string(""), long decimals=-1, size_t columnNumber=0)
virtual void deleteColumn (const string &columnName)
int version () const
void version (int value)
std::string& name ()
template<typename S> void write (const std::vector< long > &first, long nElements, const std::valarray< S > &data, S *nullValue)
template<typename S> void write (long first, long nElements, const std::valarray< S > &data, S *nullValue)
template<typename S> void write (const std::vector< long > &first, long nElements, const std::valarray< S > &data)
template<typename S> void write (long first, long nElements, const std::valarray< S > &data)
template<typename S> void write (const std::vector< long > &firstVertex, const std::vector< long > &lastVertex, const std::valarray< S > &data)
template<typename S> void read (std::valarray< S > &image)
template<typename S> void read (std::valarray< S > &image, long first, long nElements, S *nullValue)
template<typename S> void read (std::valarray< S > &image, const std::vector< long > &first, long nElements, S *nullValue)
template<typename S> void read (std::valarray< S > &image, const std::vector< long > &firstVertex, const std::vector< long > &lastVertex, const std::vector< long > &stride)
template<typename S> void read (std::valarray< S > &image, long first, long nElements)
template<typename S> void read (std::valarray< S > &image, const std::vector< long > &first, long nElements)
template<typename S> void read (std::valarray< S > &image, const std::vector< long > &firstVertex, const std::vector< long > &lastVertex, const std::vector< long > &stride, S *nullValue)

Static Public Methods

void readHduName (const fitsfile *fptr, int hduIndex, string &hduName, int &hduVersion)

Protected Methods

 ExtHDU (FITSBase *p=0, HduType xtype=AnyHdu, const string &hduName=string(""), int version=1)
 ExtHDU (FITSBase *p, HduType xtype, const string &hduName, int bitpix, int naxis, const std::vector< long > &axes, int version=1)
 ExtHDU (FITSBase *p, HduType xtype, int number)
long pcount () const
void pcount (long value)
long gcount () const
void gcount (long value)
HduType xtension () const
void xtension (HduType value)

Detailed Description

base class for all FITS extension HDUs, i.e. Image Extensions and Tables.

ExtHDU needs to have the combined public interface of Table objects and images. It achieves this by providing the same set of read and write operations as PHDU, and also providing the same operations for extracting columns from the extension as does Table [after which the column interface is accessible]. Differentiation between extension types operates by exception handling: .i.e. attempting to access image data structures on a Table object through the ExtHDU interface will or trying to return a Column reference from an Image extension will both throw an exception


Constructor & Destructor Documentation

CCfits::ExtHDU::ExtHDU ( const ExtHDU & right )
 

copy constructor.

CCfits::ExtHDU::~ExtHDU ( ) [virtual]
 

destructor.

CCfits::ExtHDU::ExtHDU ( FITSBase * p = 0,
HduType xtype = AnyHdu,
const string & hduName = string(""),
int version = 1 ) [protected]
 

default constructor, required as Standard Library Container content.

CCfits::ExtHDU::ExtHDU ( FITSBase * p,
HduType xtype,
const string & hduName,
int bitpix,
int naxis,
const std::vector< long > & axes,
int version = 1 ) [protected]
 

writing constructor.

The writing constructor forces the user to supply a name for the HDU. The bitpix, naxes and naxis data required by this constructor are required FITS keywords for any HDUs.

CCfits::ExtHDU::ExtHDU ( FITSBase * p,
HduType xtype,
int number ) [protected]
 

ExtHDU constructor for getting ExtHDUs by number.

Necessary since EXTNAME is a reserved, not required, keyword. But a synthetic name is supplied by static ExtHDU::readHduName which is called by this constructor.


Member Function Documentation

void CCfits::ExtHDU::addColumn ( ValueType type,
const string & columnName,
long repeatWidth,
const string & colUnit = string(""),
long decimals = -1,
size_t columnNumber = 0 ) [virtual]
 

add a new column to an existing table HDU.

Parameters:
type   The data type of the column to be added
columnName   The name of the column to be added
repeatWidth   for a string valued, this is the width of a string. For a numeric column it supplies the vector length of the rows. It is ignored for ascii table numeric data.
colUnit   an optional field specifying the units of the data (TUNITn)
decimal   optional parameter specifying the number of decimals for an ascii numeric column
columnNumber   optional parameter specifying column number to be created. If not specified the column is added to the end. If specified, the column is inserted and the columns already read are reindexed. This parameter is provided as a convenience to support existing code rather than recommended.

Reimplemented in CCfits::AsciiTable, and CCfits::BinTable.

HDU * CCfits::ExtHDU::clone ( FITSBase * p ) const [pure virtual]
 

virtual copy constructor.

Reimplemented from CCfits::HDU.

Reimplemented in CCfits::AsciiTable, and CCfits::BinTable.

Column & CCfits::ExtHDU::column ( int colIndex ) const [virtual]
 

return a reference to a Table column specified by column index.

This version is provided for convenience; the 'return by name' version is more efficient because columns are stored in an associative array sorted by name.

Exceptions:
WrongExtensionType   thrown if *this is an image extension.

Reimplemented in CCfits::Table.

Column & CCfits::ExtHDU::column ( const string & colName ) const [virtual]
 

return a reference to a Table column specified by name.

The overridden base class implementation ExtHDU::column throws an exception, which is thus the action to be taken if self is an image extension

Exceptions:
WrongExtensionType   see above

Reimplemented in CCfits::Table.

void CCfits::ExtHDU::deleteColumn ( const string & name ) [virtual]
 

delete a column in a Table extension by name.

Parameters:
columnName   The name of the column to be deleted.
Exceptions:
WrongExtensionType   if extension is an image.

Reimplemented in CCfits::Table.

void CCfits::ExtHDU::gcount ( long value ) [inline, protected]
 

set required gcount keyword value.

long CCfits::ExtHDU::gcount ( ) const [inline, protected]
 

return required gcount keyword value.

void makeThisCurrent ( ) const [virtual]
 

move the fitsfile pointer to this current HDU.

This function should never need to be called by the user since it is called internally whenever required.

Reimplemented from CCfits::HDU.

std::string & CCfits::ExtHDU::name ( ) [inline]
 

set/return the extension name.

const string & CCfits::ExtHDU::name ( ) const [inline]
 

return the name of the extension.

void CCfits::ExtHDU::pcount ( long value ) [inline, protected]
 

set required pcount keyword value.

long CCfits::ExtHDU::pcount ( ) const [inline, protected]
 

return required pcount keyword value.

template<typename S>
void CCfits::ExtHDU::read ( std::valarray< S > & image,
const std::vector< long > & firstVertex,
const std::vector< long > & lastVertex,
const std::vector< long > & stride,
S * nulValue )
 

read an image subset into valarray image, processing null values.

The image subset is defined by two vertices and a stride indicating the 'denseness' of the values to be picked in each dimension (a stride = (1,1,1,...) means picking every pixel in every dimension, whereas stride = (2,2,2,...) means picking every other value in each dimension.

template<typename S>
void CCfits::ExtHDU::read ( std::valarray< S > & image,
const std::vector< long > & first,
long nElements )
 

read an image section starting at a location specified by an n-tuple.

template<typename S>
void CCfits::ExtHDU::read ( std::valarray< S > & image,
long first,
long nElements )
 

read an image section starting at a specified pixel.

template<typename S>
void CCfits::ExtHDU::read ( std::valarray< S > & image,
const std::vector< long > & firstVertex,
const std::vector< long > & lastVertex,
const std::vector< long > & stride )
 

read an image subset.

template<typename S>
void CCfits::ExtHDU::read ( std::valarray< S > & image,
const std::vector< long > & first,
long nElements,
S * nulValue )
 

read part of an image array, processing null values.

As above except for

Parameters:
first   a vector<long> representing an n-tuple giving the coordinates in the image of the first pixel.

template<typename S>
void CCfits::ExtHDU::read ( std::valarray< S > & image,
long first,
long nElements,
S * nulValue )
 

read part of an image array, processing null values.

Implicit data conversion is supported (i.e. user does not need to know the type of the data stored. A WrongExtensionType extension is thrown if *this is not an image.

Parameters:
image   The receiving container, a std::valarray reference
first   The first pixel from the array to read [a long value]
nElements   The number of values to read
nullValue   A pointer containing the value in the table to be considered as undefined. See cfitsio for details

template<typename S>
void CCfits::ExtHDU::read ( std::valarray< S > & image )
 

Read image data into container.

The container image contains the entire image array after the call. This and all the other variants of read() throw a WrongExtensionType exception if called for a Table object.

void CCfits::ExtHDU::readData ( bool readFlag = false,
const std::vector< string > & keys = std::vector<string>() ) [pure virtual]
 

read data from HDU depending on readFlag and keys.

Reimplemented in CCfits::AsciiTable, and CCfits::BinTable.

void CCfits::ExtHDU::readHduName ( const fitsfile * fptr,
int hduIndex,
string & hduName,
int & hduVersion ) [static]
 

read extension name.

Used primarily to allow extensions to be specified by HDU number and provide their name for the associative array that contains them. Alternatively, if there is no name keyword in the extension, one is synthesized from the index.

long CCfits::ExtHDU::rows ( ) const [virtual]
 

return the number of rows in the extension.

Exceptions:
WrongExtensionType   thrown if *this is an image extension.

Reimplemented in CCfits::Table.

void CCfits::ExtHDU::version ( int value ) [inline]
 

set the extension version number.

int CCfits::ExtHDU::version ( ) const [inline]
 

return the extension version number.

template<typename S>
void CCfits::ExtHDU::write ( const std::vector< long > & firstVertex,
const std::vector< long > & lastVertex,
const std::valarray< S > & data )
 

write a subset (generalize slice) of data to the image.

A generalized slice/subset is a subset of the image (e.g. one plane of a data cube of size <= the dimension of the cube). It is specified by two opposite vertices. The equivalent cfitsio call does not support undefined data processing so there is no version that allows a null value to be specified.

Parameters:
firstVertex   the coordinates specifying lower and upper vertices of the n-dimensional slice
lastVertex  
data   The data to be written

template<typename S>
void CCfits::ExtHDU::write ( long first,
long nElements,
const std::valarray< S > & data )
 

write array starting from specified pixel number, without undefined data processing.

template<typename S>
void CCfits::ExtHDU::write ( const std::vector< long > & first,
long nElements,
const std::valarray< S > & data )
 

write array starting from specified n-tuple, without undefined data processing.

template<typename S>
void CCfits::ExtHDU::write ( long first,
long nElements,
const std::valarray< S > & data,
S * nulValue )
 

write array to image starting with a specified pixel and allowing undefined data to be processed.

parameters after the first are as for version with n-tuple specifying first element. these two version are equivalent, except that it is possible for the first pixel number to exceed the range of 32-bit integers, which is how long datatype is commonly implemented.

template<typename S>
void CCfits::ExtHDU::write ( const std::vector< long > & first,
long nElements,
const std::valarray< S > & data,
S * nulValue )
 

Write a set of pixels to an image extension with the first pixel specified by an n-tuple, processing undefined data.

All the overloaded versions of ExtHDU::write perform operations on *this if it is an image and throw a WrongExtensionType exception if not. Where appropriate, alternate versions allow undefined data to be processed

Parameters:
first   an n-tuple of dimension equal to the image dimension specifying the first pixel in the range to be written
nElements   number of pixels to be written
data   array of data to be written
pointer   to null value (data with this value written as undefined; needs the BLANK keyword to have been specified).

void CCfits::ExtHDU::xtension ( HduType value ) [inline, protected]
 

set the extension type.

HduType CCfits::ExtHDU::xtension ( ) const [inline, protected]
 

return the extension type.

allowed values are ImageHDU, AsciiTbl, and BinaryTbl


The documentation for this class was generated from the following files:
Generated at Fri Apr 11 16:05:10 2003 for CCfits by doxygen1.2.7 written by Dimitri van Heesch, © 1997-2001