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ObitTableOTFCal.h File Reference

ObitTableOTFCal class definition. More...

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <glib.h>
#include "Obit.h"
#include "ObitErr.h"
#include "ObitTable.h"

Go to the source code of this file.

Classes

struct  ObitTableOTFCal
 ObitTableOTFCal Class structure. More...
struct  ObitTableOTFCalRow
 ObitTableOTFCalRow Class structure. More...
struct  ObitTableOTFCalClassInfo
 ClassInfo Structure. More...
struct  ObitTableOTFCalRowClassInfo
 ClassInfo Structure For TableObitTableOTFCalRow. More...

Defines

#define MAXKEYCHARTABLEOTFCal   24
 Number of characters for Table keyword.
#define ObitTableOTFCalUnref(in)   ObitUnref (in)
 Macro to unreference (and possibly destroy) an ObitTableOTFCal returns an ObitTableOTFCal*.
#define ObitTableOTFCalRef(in)   ObitRef (in)
 Macro to reference (update reference count) an ObitTableOTFCal.
#define ObitTableOTFCalIsA(in)   ObitIsA (in, ObitTableOTFCalGetClass())
 Macro to determine if an object is the member of this or a derived class.
#define ObitTableOTFCalRowUnref(in)   ObitUnref (in)
 Macro to unreference (and possibly destroy) an ObitTableOTFCalRow returns an ObitTableOTFCalRow*.
#define ObitTableOTFCalRowRef(in)   ObitRef (in)
 Macro to reference (update reference count) an ObitTableOTFCalRow.
#define ObitTableOTFCalRowIsA(in)   ObitIsA (in, ObitTableOTFCalRowGetClass())
 Macro to determine if an object is the member of this or a derived class.

Functions

void ObitTableOTFCalRowClassInit (void)
 Public: Row Class initializer.
ObitTableOTFCalRownewObitTableOTFCalRow (ObitTableOTFCal *table)
 Public: Constructor.
gconstpointer ObitTableOTFCalRowGetClass (void)
 Public: ClassInfo pointer.
void ObitTableOTFCalClassInit (void)
 Public: Class initializer.
ObitTableOTFCalnewObitTableOTFCal (gchar *name)
 Public: Constructor.
ObitTableOTFCalnewObitTableOTFCalValue (gchar *name, Obit *file, glong *ver, ObitIOAccess access, oint numDet, oint numPoly, ObitErr *err)
 Public: Constructor from values.
gconstpointer ObitTableOTFCalGetClass (void)
 Public: ClassInfo pointer.
ObitTableOTFCalObitTableOTFCalCopy (ObitTableOTFCal *in, ObitTableOTFCal *out, ObitErr *err)
 Public: Copy (deep) constructor.
ObitTableOTFCalObitTableOTFCalClone (ObitTableOTFCal *in, ObitTableOTFCal *out)
 Public: Copy (shallow) constructor.
ObitTableOTFCalObitTableOTFCalConvert (ObitTable *in)
 Public: Convert an ObitTable to an ObitTableOTFCal.
ObitIOCode ObitTableOTFCalOpen (ObitTableOTFCal *in, ObitIOAccess access, ObitErr *err)
 Public: Create ObitIO structures and open file.
ObitIOCode ObitTableOTFCalReadRow (ObitTableOTFCal *in, glong iOTFCalRow, ObitTableOTFCalRow *row, ObitErr *err)
 Public: Read a table row.
void ObitTableOTFCalSetRow (ObitTableOTFCal *in, ObitTableOTFCalRow *row, ObitErr *err)
 Public: Init a table row for write.
ObitIOCode ObitTableOTFCalWriteRow (ObitTableOTFCal *in, glong iOTFCalRow, ObitTableOTFCalRow *row, ObitErr *err)
 Public: Write a table row.
ObitIOCode ObitTableOTFCalClose (ObitTableOTFCal *in, ObitErr *err)
 Public: Close file and become inactive.


Detailed Description

ObitTableOTFCal class definition.

This class contains tabular data and allows access. "OTFCal" contains calibration information for OTF data. Calibrated data for each detector are: $$ cal\ = \ { mult} ({ raw}\ -\ { cal}\ -\

This class contains tabular data and allows access. ObitTableOTFCal" An ObitTableOTFCal is the front end to a persistent disk resident structure. This class is derived from the ObitTable class.

Table 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 #ObitTableOTFCalDesc.

In addition to the normal tabular data, a table will have a "_status" column to indicate the status of each row. The status value is read from and written to (some modification) AIPS tables but are not written to externally generated FITS tables which don't have these colummns. It will be written to Obit generated tables which will have these columns. Status values:

Specifying desired data transfer parameters

The desired data transfers are specified in the member ObitInfoList. There are separate sets of parameters used to specify the FITS data files. 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). To specify whether the underlying data files are FITS The following apply to both types of files:

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 #ObitTableOTFCalSetFITS 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:

Creators and Destructors

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

A copy of a pointer to an ObitTableOTFCal should always be made using the ObitTableOTFCalRef function which updates the reference count in the object. Then whenever freeing an ObitTableOTFCal or changing a pointer, the function ObitTableOTFCalUnref 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 ObitTableOTFCal or some external location. To Write an ObitTableOTFCal, create it, open it, and write. The object should be closed to ensure all data is flushed to disk. Deletion of an ObitTableOTFCal after its final unreferencing will automatically close it.

Define Documentation

#define MAXKEYCHARTABLEOTFCal   24
 

Number of characters for Table keyword.

#define ObitTableOTFCalIsA in   )     ObitIsA (in, ObitTableOTFCalGetClass())
 

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 ObitTableOTFCalRef in   )     ObitRef (in)
 

Macro to reference (update reference count) an ObitTableOTFCal.

returns an ObitTableOTFCal*. in = object to reference

#define ObitTableOTFCalRowIsA in   )     ObitIsA (in, ObitTableOTFCalRowGetClass())
 

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 ObitTableOTFCalRowRef in   )     ObitRef (in)
 

Macro to reference (update reference count) an ObitTableOTFCalRow.

returns an ObitTableOTFCalRow*. in = object to reference

#define ObitTableOTFCalRowUnref in   )     ObitUnref (in)
 

Macro to unreference (and possibly destroy) an ObitTableOTFCalRow returns an ObitTableOTFCalRow*.

in = object to unreference

#define ObitTableOTFCalUnref in   )     ObitUnref (in)
 

Macro to unreference (and possibly destroy) an ObitTableOTFCal returns an ObitTableOTFCal*.

in = object to unreference


Function Documentation

ObitTableOTFCal* newObitTableOTFCal gchar *  name  ) 
 

Public: Constructor.

Initializes class if needed on first call.

Parameters:
name An optional name for the object.
Returns:
the new object.

ObitTableOTFCalRow* newObitTableOTFCalRow ObitTableOTFCal 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.

ObitTableOTFCal* newObitTableOTFCalValue gchar *  name,
Obit *  file,
glong *  ver,
ObitIOAccess  access,
oint  numDet,
oint  numPoly,
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.
numDet Number of detectors)
numPoly Number of polynomial coefficients describing atmospheric emission
err Error stack, returns if not empty.
Returns:
the new object, NULL on failure.

void ObitTableOTFCalClassInit void   ) 
 

Public: Class initializer.

ObitTableOTFCal* ObitTableOTFCalClone ObitTableOTFCal in,
ObitTableOTFCal out
 

Public: Copy (shallow) constructor.

ObitIOCode ObitTableOTFCalClose ObitTableOTFCal 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

ObitTableOTFCal* ObitTableOTFCalConvert ObitTable *  in  ) 
 

Public: Convert an ObitTable to an ObitTableOTFCal.

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.

ObitTableOTFCal* ObitTableOTFCalCopy ObitTableOTFCal in,
ObitTableOTFCal 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 ObitTableOTFCalGetClass void   ) 
 

Public: ClassInfo pointer.

Returns:
pointer to the class structure.

ObitIOCode ObitTableOTFCalOpen ObitTableOTFCal 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 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 ObitTableOTFCalReadRow ObitTableOTFCal in,
glong  iOTFCalRow,
ObitTableOTFCalRow 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
iOTFCalRow Row number, -1 -> next
row Table Row structure to receive data
err ObitErr for reporting errors.
Returns:
return code, OBIT_IO_OK=> OK

void ObitTableOTFCalRowClassInit void   ) 
 

Public: Row Class initializer.

gconstpointer ObitTableOTFCalRowGetClass void   ) 
 

Public: ClassInfo pointer.

Returns:
pointer to the Row class structure.

void ObitTableOTFCalSetRow ObitTableOTFCal in,
ObitTableOTFCalRow 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 ObitTableOTFCalWriteRow ObitTableOTFCal in,
glong  iOTFCalRow,
ObitTableOTFCalRow 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 ObitTableOTFCalSetRow

Parameters:
in Table to read
iOTFCalRow Row number, -1 -> next
row Table Row structure containing data
err ObitErr for reporting errors.
Returns:
return code, OBIT_IO_OK=> OK


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