ObitTableIDI_UV_DATA.h File Reference

ObitTableIDI_UV_DATA class definition. More...

#include "Obit.h"
#include "ObitErr.h"
#include "ObitTable.h"
#include "ObitData.h"

Go to the source code of this file.

Classes
struct	ObitTableIDI_UV_DATA
	ObitTableIDI_UV_DATA Class structure. More...
struct	ObitTableIDI_UV_DATARow
	ObitTableIDI_UV_DATARow Class structure. More...
struct	ObitTableIDI_UV_DATAClassInfo
	ClassInfo Structure. More...
struct	ObitTableIDI_UV_DATARowClassInfo
	ClassInfo Structure For TableIDI_UV_DATARow. More...
Defines
#define	MAXKEYCHARTABLEIDI_UV_DATA   24
	Number of characters for Table keyword.
#define	ObitTableIDI_UV_DATAUnref(in)   ObitUnref (in)
	Macro to unreference (and possibly destroy) an ObitTableIDI_UV_DATA returns an ObitTableIDI_UV_DATA*.
#define	ObitTableIDI_UV_DATARef(in)   ObitRef (in)
	Macro to reference (update reference count) an ObitTableIDI_UV_DATA.
#define	ObitTableIDI_UV_DATAIsA(in)   ObitIsA (in, ObitTableIDI_UV_DATAGetClass())
	Macro to determine if an object is the member of this or a derived class.
#define	ObitTableIDI_UV_DATARowUnref(in)   ObitUnref (in)
	Macro to unreference (and possibly destroy) an ObitTableIDI_UV_DATARow returns an ObitTableIDI_UV_DATARow*.
#define	ObitTableIDI_UV_DATARowRef(in)   ObitRef (in)
	Macro to reference (update reference count) an ObitTableIDI_UV_DATARow.
#define	ObitTableIDI_UV_DATARowIsA(in)   ObitIsA (in, ObitTableIDI_UV_DATARowGetClass())
	Macro to determine if an object is the member of this or a derived class.
Functions
void	ObitTableIDI_UV_DATARowClassInit (void)
	Public: Row Class initializer.
ObitTableIDI_UV_DATARow *	newObitTableIDI_UV_DATARow (ObitTableIDI_UV_DATA *table)
	Public: Constructor.
gconstpointer	ObitTableIDI_UV_DATARowGetClass (void)
	Public: ClassInfo pointer.
void	ObitTableIDI_UV_DATAClassInit (void)
	Public: Class initializer.
ObitTableIDI_UV_DATA *	newObitTableIDI_UV_DATA (gchar *name)
	Public: Constructor.
ObitTableIDI_UV_DATA *	newObitTableIDI_UV_DATAValue (gchar *name, ObitData *file, glong *ver, ObitIOAccess access, oint no_band, oint maxis1, oint maxis2, oint maxis3, oint maxis4, oint maxis5, ObitErr *err)
	Public: Constructor from values.
gconstpointer	ObitTableIDI_UV_DATAGetClass (void)
	Public: ClassInfo pointer.
ObitTableIDI_UV_DATA *	ObitTableIDI_UV_DATACopy (ObitTableIDI_UV_DATA *in, ObitTableIDI_UV_DATA *out, ObitErr *err)
	Public: Copy (deep) constructor.
ObitTableIDI_UV_DATA *	ObitTableIDI_UV_DATAClone (ObitTableIDI_UV_DATA *in, ObitTableIDI_UV_DATA *out)
	Public: Copy (shallow) constructor.
ObitTableIDI_UV_DATA *	ObitTableIDI_UV_DATAConvert (ObitTable *in)
	Public: Convert an ObitTable to an ObitTableIDI_UV_DATA.
ObitIOCode	ObitTableIDI_UV_DATAOpen (ObitTableIDI_UV_DATA *in, ObitIOAccess access, ObitErr *err)
	Public: Create ObitIO structures and open file.
ObitIOCode	ObitTableIDI_UV_DATAReadRow (ObitTableIDI_UV_DATA *in, glong iIDI_UV_DATARow, ObitTableIDI_UV_DATARow *row, ObitErr *err)
	Public: Read a table row.
void	ObitTableIDI_UV_DATASetRow (ObitTableIDI_UV_DATA *in, ObitTableIDI_UV_DATARow *row, ObitErr *err)
	Public: Init a table row for write.
ObitIOCode	ObitTableIDI_UV_DATAWriteRow (ObitTableIDI_UV_DATA *in, glong iIDI_UV_DATARow, ObitTableIDI_UV_DATARow *row, ObitErr *err)
	Public: Write a table row.
ObitIOCode	ObitTableIDI_UV_DATAClose (ObitTableIDI_UV_DATA *in, ObitErr *err)
	Public: Close file and become inactive.

---

Detailed Description

ObitTableIDI_UV_DATA class definition.

This class is derived from the ObitTable class.

This class contains tabular data and allows access. This table is part of the IDI uv data format. An IDI table radio interferometer observational data.

This class contains tabular data and allows access. "IDI_UV_DATA" table An ObitTableIDI_UV_DATA is the front end to a persistent disk resident structure. Only FITS (as Tables) are supported.

HistoryTable data storage

In memory tables are stored in a fashion similar to how they are stored on disk - in large blocks in memory rather than structures. Due to the word alignment requirements of some machines, they are stored by order of the decreasing element size: double, float long, int, short, char rather than the logical order. The details of the storage in the buffer are kept in the #ObitTableIDI_UV_DATADesc.

In addition to the normal tabular data, a table will have a "_status" column to indicate the status of each row.

Specifying desired data transfer parameters

The desired data transfers are specified in the member ObitInfoList. In the following an ObitInfoList entry is defined by the name in double quotes, the data type code as an #ObitInfoType enum and the dimensions of the array (? => depends on application).

The following apply to both types of files:

• "nRowPIO", OBIT_int, Max. Number of visibilities per "Read" or "Write" operation. Default = 1.

FITS files

This implementation uses cfitsio which allows using, in addition to regular FITS images, gzip compressed files, pipes, shared memory and a number of other input forms. The convenience Macro #ObitTableIDI_UV_DATASetFITS simplifies specifying the desired data. Binary tables are used for storing visibility data in FITS. For accessing FITS files the following entries in the ObitInfoList are used:

• "FileName" OBIT_string (?,1,1) FITS file name.
• "TabName" OBIT_string (?,1,1) Table name (e.g. "AIPS CC").
• "Ver" OBIT_int (1,1,1) Table version number

Creators and Destructors

An ObitTableIDI_UV_DATA can be created using newObitTableIDI_UV_DATAValue which attaches the table to an ObitData for the object. If the output ObitTableIDI_UV_DATA has previously been specified, including file information, then ObitTableIDI_UV_DATACopy will copy the disk resident as well as the memory resident information.

A copy of a pointer to an ObitTableIDI_UV_DATA should always be made using the ObitTableIDI_UV_DATARef function which updates the reference count in the object. Then whenever freeing an ObitTableIDI_UV_DATA or changing a pointer, the function ObitTableIDI_UV_DATAUnref will decrement the reference count and destroy the object when the reference count hits 0.

I/O

Visibility data is available after an input object is "Opened" and "Read". I/O optionally uses a buffer attached to the ObitTableIDI_UV_DATA or some external location. To Write an ObitTableIDI_UV_DATA, create it, open it, and write. The object should be closed to ensure all data is flushed to disk. Deletion of an ObitTableIDI_UV_DATA after its final unreferencing will automatically close it.

---

Define Documentation

#define MAXKEYCHARTABLEIDI_UV_DATA   24

Number of characters for Table keyword.

#define ObitTableIDI_UV_DATAIsA (  in   )     ObitIsA (in, ObitTableIDI_UV_DATAGetClass())

Macro to determine if an object is the member of this or a derived class. Returns TRUE if a member, else FALSE in = object to reference

#define ObitTableIDI_UV_DATARef (  in   )     ObitRef (in)

Macro to reference (update reference count) an ObitTableIDI_UV_DATA. returns an ObitTableIDI_UV_DATA*. in = object to reference

#define ObitTableIDI_UV_DATARowIsA (  in   )     ObitIsA (in, ObitTableIDI_UV_DATARowGetClass())

Macro to determine if an object is the member of this or a derived class. Returns TRUE if a member, else FALSE in = object to reference

#define ObitTableIDI_UV_DATARowRef (  in   )     ObitRef (in)

Macro to reference (update reference count) an ObitTableIDI_UV_DATARow. returns an ObitTableIDI_UV_DATARow*. in = object to reference

#define ObitTableIDI_UV_DATARowUnref (  in   )     ObitUnref (in)

Macro to unreference (and possibly destroy) an ObitTableIDI_UV_DATARow returns an ObitTableIDI_UV_DATARow*. in = object to unreference

#define ObitTableIDI_UV_DATAUnref (  in   )     ObitUnref (in)

Macro to unreference (and possibly destroy) an ObitTableIDI_UV_DATA returns an ObitTableIDI_UV_DATA*. in = object to unreference

---

Function Documentation

ObitTableIDI_UV_DATA* newObitTableIDI_UV_DATA (  gchar *  name  )

Public: Constructor. Initializes class if needed on first call. Parameters: name  An optional name for the object. Returns: the new object.

ObitTableIDI_UV_DATARow* newObitTableIDI_UV_DATARow (  ObitTableIDI_UV_DATA *  table  )

Public: Constructor. If table is open and for write, the row is attached to the buffer Initializes Row class if needed on first call. Parameters: name  An optional name for the object. Returns: the new object.

ObitTableIDI_UV_DATA* newObitTableIDI_UV_DATAValue (  gchar *  name, ObitData *  file, glong *  ver, ObitIOAccess  access, oint  no_band, oint  maxis1, oint  maxis2, oint  maxis3, oint  maxis4, oint  maxis5, ObitErr *  err )

Public: Constructor from values. Creates a new table structure and attaches to the TableList of file. If the specified table already exists then it is returned. Initializes class if needed on first call. Forces an update of any disk resident structures (e.g. AIPS header). Parameters: name  An optional name for the object. file  ObitData which which the table is to be associated. ver  Table version number. 0=> add higher, value used returned access  access (OBIT_IO_ReadOnly, means do not create if it doesn't exist. no_band  Number of frequency bands (IF) maxis1  [OPTIONAL] Number of pixels on axis 1 maxis2  [OPTIONAL] Number of pixels on axis 2 maxis3  [OPTIONAL] Number of pixels on axis 3 maxis4  [OPTIONAL] Number of pixels on axis 4 maxis5  [OPTIONAL] Number of pixels on axis 5 err  Error stack, returns if not empty. Returns: the new object, NULL on failure.

void ObitTableIDI_UV_DATAClassInit (  void   )

Public: Class initializer.

ObitTableIDI_UV_DATA* ObitTableIDI_UV_DATAClone (  ObitTableIDI_UV_DATA *  in, ObitTableIDI_UV_DATA *  out )

Public: Copy (shallow) constructor.

ObitIOCode ObitTableIDI_UV_DATAClose (  ObitTableIDI_UV_DATA *  in, ObitErr *  err )

Public: Close file and become inactive. Parameters: in  Pointer to object to be closed. err  ObitErr for reporting errors. Returns: error code, OBIT_IO_OK=> OK

ObitTableIDI_UV_DATA* ObitTableIDI_UV_DATAConvert (  ObitTable *  in  )

Public: Convert an ObitTable to an ObitTableIDI_UV_DATA. New object will have references to members of in. Parameters: in  The object to copy, will still exist afterwards and should be Unrefed if not needed. Returns: pointer to the new object.

ObitTableIDI_UV_DATA* ObitTableIDI_UV_DATACopy (  ObitTableIDI_UV_DATA *  in, ObitTableIDI_UV_DATA *  out, ObitErr *  err )

Public: Copy (deep) constructor. Copies are made of complex members including disk files; these will be copied applying whatever selection is associated with the input. Objects should be closed on input and will be closed on output. In order for the disk file structures to be copied, the output file must be sufficiently defined that it can be written. The copy will be attempted but no errors will be logged until both input and output have been successfully opened. ObitInfoList and ObitThread members are only copied if the output object didn't previously exist. Parent class members are included but any derived class info is ignored. Parameters: in  The object to copy out  An existing object pointer for output or NULL if none exists. err  Error stack, returns if not empty. Returns: pointer to the new object.

gconstpointer ObitTableIDI_UV_DATAGetClass (  void   )

Public: ClassInfo pointer. Returns: pointer to the class structure.

ObitIOCode ObitTableIDI_UV_DATAOpen (  ObitTableIDI_UV_DATA *  in, ObitIOAccess  access, ObitErr *  err )

Public: Create ObitIO structures and open file. The image descriptor is read if OBIT_IO_ReadOnly or OBIT_IO_ReadWrite and written to disk if opened OBIT_IO_WriteOnly. After the file has been opened the member, buffer is initialized for reading/storing the table unless member bufferSize is <0. If the requested version ("Ver" in InfoList) is 0 then the highest numbered table of the same type is opened on Read or Read/Write, or a new table is created on on Write. The file etc. info should have been stored in the ObitInfoList: "FileType" OBIT_int scalar = OBIT_IO_FITS (AIPS not allowed) for file type (see class documentation for details). "nRowPIO" OBIT_int scalar = Maximum number of table rows per transfer, this is the target size for Reads (may be fewer) and is used to create buffers. Parameters: in  Pointer to object to be opened. access  access (OBIT_IO_ReadOnly,OBIT_IO_ReadWrite, or OBIT_IO_WriteOnly). If OBIT_IO_WriteOnly any existing data in the output file will be lost. err  ObitErr for reporting errors. Returns: return code, OBIT_IO_OK=> OK

ObitIOCode ObitTableIDI_UV_DATAReadRow (  ObitTableIDI_UV_DATA *  in, glong  iIDI_UV_DATARow, ObitTableIDI_UV_DATARow *  row, ObitErr *  err )

Public: Read a table row. Scalar values are copied but for array values, pointers into the data array are returned. Parameters: in  Table to read iIDI_UV_DATARow  Row number, -1 -> next row  Table Row structure to receive data err  ObitErr for reporting errors. Returns: return code, OBIT_IO_OK=> OK

void ObitTableIDI_UV_DATARowClassInit (  void   )

Public: Row Class initializer.

gconstpointer ObitTableIDI_UV_DATARowGetClass (  void   )

Public: ClassInfo pointer. Returns: pointer to the Row class structure.

void ObitTableIDI_UV_DATASetRow (  ObitTableIDI_UV_DATA *  in, ObitTableIDI_UV_DATARow *  row, ObitErr *  err )

Public: Init a table row for write. This is only useful prior to filling a row structure in preparation . for a WriteRow operation. Array members of the Row structure are . pointers to independently allocated memory, this routine allows using . the table IO buffer instead of allocating yet more memory.. This routine need only be called once to initialize a Row structure for write.. Parameters: in  Table with buffer to be written row  Table Row structure to attach err  ObitErr for reporting errors.

ObitIOCode ObitTableIDI_UV_DATAWriteRow (  ObitTableIDI_UV_DATA *  in, glong  iIDI_UV_DATARow, ObitTableIDI_UV_DATARow *  row, ObitErr *  err )

Public: Write a table row. Before calling this routine, the row structure needs to be initialized and filled with data. The array members of the row structure are pointers to independently allocated memory. These pointers can be set to the correct table buffer locations using ObitTableIDI_UV_DATASetRow Parameters: in  Table to read iIDI_UV_DATARow  Row number, -1 -> next row  Table Row structure containing data err  ObitErr for reporting errors. Returns: return code, OBIT_IO_OK=> OK

---