CCfits 2.6

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CCfits::Table Class Referenceabstract

`#include <Table.h>`

Inheritance diagram for CCfits::Table:

## Classes
class | NoSuchColumn
| Exception to be thrown on a failure to retrieve a column specified either by name or index number. More...

## Public Member Functions
| Table (const Table &right)
| copy constructor
virtual | ~Table ()
| destructor
virtual Column & | column (const String &colName, bool caseSensitive=true) const
| return a reference to a Table column specified by name. More...
virtual Column & | column (int colIndex) const
| return a reference to the column identified by colIndex More...
virtual const ColMap & | column () const
| return a reference to the multimap containing the columns. More...
virtual ColMap & | column ()
| return a reference to the multimap containing the columns. More...
virtual void | copyColumn (const Column &inColumn, int colIndx, bool insertNewCol=true)
| copy a column (from different or same HDU and file) into an existing table HDU. More...
virtual void | deleteColumn (const String &columnName)
| delete a column in a Table extension by name. More...
void | deleteRows (long first, long number=1)
| delete a range of rows in a table. More...
void | deleteRows (const std::vector< long > &rowList)
| delete a set of rows in the table specified by an input array. More...
virtual long | getRowsize () const
| return the optimal number of rows to read or write at a time More...
void | insertRows (long first, long number=1)
| insert empty rows into the table More...
virtual int | numCols () const
| return the number of Columns in the Table (the TFIELDS keyword).
virtual long | rows () const
| return the number of rows in the table (NAXIS2).
void | rows (long numRows)
| set the number of rows in the Table.
void | updateRows ()
| update the number of rows in the table More...
Public Member Functions inherited from CCfits::ExtHDU
| ExtHDU (const ExtHDU &right)
| copy constructor
virtual | ~ExtHDU ()
| destructor
virtual void | addColumn (ValueType type, const String &columnName, long repeatWidth, const String &colUnit=String(""), long decimals=-1, size_t columnNumber=0)
| add a new column to an existing table HDU. More...
virtual HDU * | clone (FITS *p) const =0
| virtual copy constructor
bool | isCompressed () const
| return true if image is stored using compression. More...
virtual void | makeThisCurrent () const
| move the fitsfile pointer to this current HDU. More...
const String & | name () const
| return the name of the extension.
template<typename S >
void | read (std::valarray< S > &image)
| Read image data into container. More...
template<typename S >
void | read (std::valarray< S > &image, long first, long nElements, S *nullValue)
| read part of an image array, processing null values. More...
template<typename S >
void | read (std::valarray< S > &image, const std::vector< long > &first, long nElements, S *nullValue)
| read part of an image array, processing null values. More...
template<typename S >
void | 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 | read (std::valarray< S > &image, long first, long nElements)
| read an image section starting at a specified pixel
template<typename S >
void | 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 | read (std::valarray< S > &image, const std::vector< long > &firstVertex, const std::vector< long > &lastVertex, const std::vector< long > &stride, S *nullValue)
| read an image subset into valarray image, processing null values More...
virtual void | readData (bool readFlag=false, const std::vector< String > &keys=std::vector< String >())=0
| read data from HDU depending on readFlag and keys.
int | version () const
| return the extension version number.
void | version (int value)
| set the extension version number
template<typename S >
void | write (const std::vector< long > &first, long nElements, const std::valarray< S > &data, S *nullValue)
| Write a set of pixels to an image extension with the first pixel specified by an n-tuple, processing undefined data. More...
template<typename S >
void | write (long first, long nElements, const std::valarray< S > &data, S *nullValue)
| write array to image starting with a specified pixel and allowing undefined data to be processed More...
template<typename S >
void | 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 | 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 | 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 More...
Public Member Functions inherited from CCfits::HDU
| HDU (const HDU &right)
| copy constructor
template<typename T >
Keyword & | addKey (const String &name, T val, const String &comment, bool isLongStr=false)
| create a new keyword in the HDU with specified value and comment fields More...
Keyword * | addKey (const Keyword *inKeyword)
| create a copy of an existing Keyword and add to HDU More...
long | axes () const
| return the number of axes in the HDU data section (always 2 for tables).
long | axis (size_t index) const
| return the size of axis numbered index [zero based]. More...
long | bitpix () const
| return the data type keyword. More...
const string & | comment () const
| return the comment string previously read by getComment()
void | copyAllKeys (const HDU *inHdu, const std::vector< int > &keyCategories=std::vector< int >())
| copy all keys from another header More...
void | deleteKey (const String &doomed)
| delete a keyword from the header More...
fitsfile * | fitsPointer () const
| return the fitsfile pointer for the FITS object containing the HDU
std::pair< unsigned long, unsigned long > | getChecksum () const
| compute and return the checksum values for the HDU without creating or modifying the CHECKSUM/DATASUM keywords. More...
const String & | getComments ()
| read the comments from the HDU and add it to the FITS object. More...
const String & | getHistory ()
| read the history information from the HDU and add it to the FITS object. More...
const string & | history () const
| return the history string previously read by getHistory()
void | index (int value)
| set the HDU number
int | index () const
| return the HDU number
std::map< String, Keyword * > & | keyWord ()
| return the associative array containing the HDU keywords so far read.
Keyword & | keyWord (const String &keyName)
| return a (previously read) keyword from the HDU object.
const std::map< string, Keyword * > & | keyWord () const
| return the associative array containing the HDU Keywords that have been read so far.
const Keyword & | keyWord (const string &keyname) const
| return a (previously read) keyword from the HDU object. const version
bool | operator!= (const HDU &right) const
| inequality operator
bool | operator== (const HDU &right) const
| equality operator
FITS * | parent () const
| return reference to the pointer representing the FITS object containing the HDU
void | readAllKeys (const std::vector< int > &keyCategories=std::vector< int >())
| read all of the keys in the header More...
template<typename T >
void | readKey (const String &keyName, T &val)
| read a keyword of specified type from the header of a disk FITS file and return its value. More...
template<typename T >
void | readKeys (std::vector< String > &keyNames, std::vector< T > &vals)
| read a set of specified keywords of the same data type from the header of a disk FITS file and return their values More...
Keyword & | readNextKey (const std::vector< String > &incList, const std::vector< String > &excList, bool searchFromBeginning=false)
| Read the next key in the HDU which matches a string in incList, and does not match string in excList. More...
virtual void | resetImageRead ()
| force next image reading operation to read from file instead of object cache. More...
virtual double | scale () const
| return the BSCALE keyword value
virtual void | scale (double value)
| set the BSCALE keyword value for images (see warning for images of int type) More...
virtual void | suppressScaling (bool toggle=true)
| turn off image scaling regardless of the BSCALE and BZERO keyword values More...
void | updateChecksum ()
| update the CHECKSUM keyword value, assuming DATASUM exists and is correct More...
std::pair< int, int > | verifyChecksum () const
| verify the HDU by computing the checksums and comparing them with the CHECKSUM/DATASUM keywords More...
void | writeChecksum ()
| compute and write the DATASUM and CHECKSUM keyword values More...
void | writeComment (const String &comment="Generic Comment")
| write a comment string. More...
void | writeDate ()
| write a date string to *this.
void | writeHistory (const String &history="Generic History String")
| write a history string. More...
virtual double | zero () const
| return the BZERO keyword value
virtual void | zero (double value)
| set the BZERO keyword value for images (see warning for images of int type) More...

## Protected Member Functions
| Table (FITS *p, HduType xtype, const String &hduName, int rows, const std::vector< String > &columnName, const std::vector< String > &columnFmt, const std::vector< String > &columnUnit=std::vector< String >(), int version=1)
| Constructor to be used for creating new HDUs. More...
| Table (FITS *p, int version=1, const String &groupName=String(""))
| Constructor to be called when creating a grouping table. More...
| Table (FITS *p, HduType xtype, const String &hduName=String(""), int version=1)
| Constructor to be called by operations that read Table specified by hduName and version.
| Table (FITS *p, HduType xtype, int number)
| Table constructor for getting Tables by number. More...
void | init (bool readFlag=false, const std::vector< String > &keys=std::vector< String >())
void | numCols (int value)
| set the number of Columns in the Table
Protected Member Functions inherited from CCfits::ExtHDU
| ExtHDU (FITS *p, HduType xtype, const String &hduName, int version)
| default constructor, required as Standard Library Container content.
| ExtHDU (FITS *p, HduType xtype, const String &hduName, int bitpix, int naxis, const std::vector< long > &axes, int version)
| writing constructor. More...
| ExtHDU (FITS *p, HduType xtype, int number)
| ExtHDU constructor for getting ExtHDUs by number. More...
long | gcount () const
| return required gcount keyword value
void | gcount (long value)
| set required gcount keyword value
long | pcount () const
| return required pcount keyword value
void | pcount (long value)
| set required pcount keyword value
HduType | xtension () const
| return the extension type More...
void | xtension (HduType value)
| set the extension type
Protected Member Functions inherited from CCfits::HDU
| HDU (FITS *p=0)
| default constructor, called by HDU subclasses that read from FITS files.
| HDU (FITS *p, int bitpix, int naxis, const std::vector< long > &axes)
| constructor for creating new HDU objects, called by HDU subclasses writing to FITS files.
virtual | ~HDU ()
| destructor
std::vector< long > & | naxes ()
| return the HDU data axis array.

## Additional Inherited Members
Static Public Member Functions inherited from CCfits::ExtHDU
static void | readHduName (const fitsfile *fptr, int hduIndex, String &hduName, int &hduVersion)
| read extension name. More...
Static Public Member Functions inherited from CCfits::HDU
static std::vector< int > | keywordCategories ()
| Return the default enumerated keyword categories used by copyAllKeys() More...

## Detailed Description

Table is the abstract common interface to Binary and Ascii Table HDUs.

Table is a subclass of ExtHDU that contains an associative array of Column objects. It implements methods for reading and writing columns

## Constructor & Destructor Documentation

CCfits::Table::Table | ( | FITS * | p,
|  | HduType | xtype,
|  | const String & | hduName,
|  | int | rows,
|  | const std::vector< String > & | columnName,
|  | const std::vector< String > & | columnFmt,
|  | const std::vector< String > & | columnUnit = `std::vector<String>()`,
|  | int | version = `1`
| ) |  |
| protected

Constructor to be used for creating new HDUs.

Parameters

  p | The FITS file in which to place the new HDU
  xtype | An HduType enumerator defined in CCfits.h for type of table (AsciiTbl or BinaryTbl)
  hduName | The name of this HDU extension
  rows | The number of rows in the new HDU (the value of the NAXIS2 keyword).
  columnName | a vector of names for the columns.
  columnFmt | the format strings for the columns
  columnUnit | the units for the columns.
  version | a version number

CCfits::Table::Table | ( | FITS * | p,
|  | int | version = `1`,
|  | const String & | groupName = `String("")`
| ) |  |
| protected

Constructor to be called when creating a grouping table.

Parameters

  p | The FITS file in which to place the new HDU
  version | Version number
  groupName | The name of the grouping table

CCfits::Table::Table | ( | FITS * | p,
|  | HduType | xtype,
|  | int | number
| ) |  |
| protected

Table constructor for getting Tables by number.

Necessary since EXTNAME is a reserved not required keyword, and users may thus read FITS files without an extension name. Since an HDU is completely specified by extension number, this is part of the public interface.

## Member Function Documentation

Column & CCfits::Table::column | ( | const String & | colName,
|  | bool | caseSensitive = `true`
| ) |  | const
| virtual

return a reference to a Table column specified by name.

If the caseSensitive parameter is set to false, the search will be case-insensitive. 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 from CCfits::ExtHDU.

Column & CCfits::Table::column | ( | int | colIndex | ) | const
| virtual

return a reference to the column identified by colIndex

Throws NoSuchColumn if the index is out of range -index must satisfy (1 <= index <= numCols() ).

N.B. the column number is assigned as 1-based, as in FORTRAN rather than 0-based as in C.

Exceptions

  Table::NoSuchColumn | passes colIndex to the diagnostic message printed when the exception is thrown

Reimplemented from CCfits::ExtHDU.

const ColMap & CCfits::Table::column | ( |  | ) | const
| inline virtual

return a reference to the multimap containing the columns.

This public version might be used to query the size of the column container in a routine that manipulates column table data.

Reimplemented from CCfits::ExtHDU.

ColMap & CCfits::Table::column | ( |  | ) |
| inline virtual

return a reference to the multimap containing the columns.

To be used in the implementation of subclasses.

void CCfits::Table::copyColumn | ( | const Column & | inColumn,
|  | int | colIndx,
|  | bool | insertNewCol = `true`
| ) |  |
| virtual

copy a column (from different or same HDU and file) into an existing table HDU.

This is meant to provide the same functionality as CFITSIO's fits_copy_col, and therefore does not work with columns with variable length fields. Copying a column from an AsciiTable to a BinTable is prohibited. colIndx range should be from 1 to nCurrentCols+1 if inserting, or 1 to nCurrentCols if replacing.

Parameters

  inColumn | The Column object which is to be copied
  colIndx | The position for which the copied Column will be placed (first colIndx = 1).
  insertNewCol | If 'true', new Column will be inserted in or appended to table. If 'false', Column will replace current Column at position = colIndx.

Reimplemented from CCfits::ExtHDU.

void CCfits::Table::deleteColumn | ( | const String & | columnName | ) |
| 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 from CCfits::ExtHDU.

void CCfits::Table::deleteRows | ( | long | first,
|  | long | number = `1`
| ) |  |

delete a range of rows in a table.

In both this and the overloaded version which allows a selection of rows to be deleted, the cfitsio library is called first to perform the operation on the disk file, and then the FITS object is updated.

Parameters

  first | the start row of the range
  number | the number of rows to delete; defaults to 1.

Exceptions

  FitsError | thrown if the cfitsio call fails to return without error.

void CCfits::Table::deleteRows | ( | const std::vector< long > & | rowlist | ) |

delete a set of rows in the table specified by an input array.

Parameters

  rowlist | The vector of row numbers to be deleted.

Exceptions

  FitsError | thrown if the underlying cfitsio call fails to return without error.

long CCfits::Table::getRowsize | ( |  | ) | const
| virtual

return the optimal number of rows to read or write at a time

A wrapper for the CFITSIO function fits_get_rowsize, useful for obtaining maximum I/O efficiency. This will throw if it is not called for a Table extension.

Reimplemented from CCfits::ExtHDU.

void CCfits::Table::init | ( | bool | readFlag = `false`,
|  | const std::vector< String > & | keys = `std::vector<String>()`
| ) |  |
| protected

"Late Constructor." wrap-up of calls needed to construct a table. Reads header information and sets up the array of column objects in the table.

Protected function, provided to allow the implementation of extensions of the library.

void CCfits::Table::insertRows | ( | long | first,
|  | long | number = `1`
| ) |  |

insert empty rows into the table

Parameters

  first | the start row of the range
  number | the number of rows to insert.

Exceptions

  FitsError | thrown if the underlying cfitsio call fails to return without error.

void CCfits::Table::updateRows | ( |  | ) |

update the number of rows in the table

Called to force the Table to reset its internal "rows" attribute. public, but is called when needed internally.

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

- Table.h
- Table.cxx