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casacore::TableDesc Class Reference

Define the structure of a Casacore table. More...

#include <TableDesc.h>

Public Types

enum  TDOption {
  Old,
  New,
  NewNoReplace,
  Scratch,
  Update,
  Delete
}
 

Public Member Functions

 TableDesc ()
 The default constructor creates a table description with option = Scratch and a blank name. More...
 
 TableDesc (const String &type, TDOption=Old)
 Create a table description object with the given name. More...
 
 TableDesc (const String &type, const String &version, TDOption=Old)
 Create a table description object with the given name (i.e. More...
 
 TableDesc (const String &type, const String &version, const TabPath &, TDOption=Old)
 Create a table description object. More...
 
 TableDesc (const TableDesc &, const String &type, const String &version, TDOption, Bool copyColumns=True)
 Create a table description object with the given name (i.e. More...
 
 TableDesc (const TableDesc &, const String &type, const String &version, const TabPath &, TDOption, Bool copyColumns=True)
 Create a table description object with the given name (i.e. More...
 
 TableDesc (const TableDesc &, TDOption=Scratch)
 This copy constructor makes a copy of the table description maintaining its name and version. More...
 
 ~TableDesc ()
 The destructor writes the table description if changed. More...
 
const ColumnDescSetcolumnDescSet () const
 Get access to the set of column descriptions. More...
 
void add (const TableDesc &other, Bool addKeywordSet=True)
 Add another table description to this table description. More...
 
TableRecordrwKeywordSet ()
 Get access to the keyword set. More...
 
const TableRecordkeywordSet () const
 
const TableRecordprivateKeywordSet () const
 Get readonly access to the private set of keywords. More...
 
ColumnDescaddColumn (const ColumnDesc &)
 Add a column to the table description. More...
 
ColumnDescaddColumn (const ColumnDesc &, const String &newname)
 Add a column to the table description and give it another name. More...
 
void removeColumn (const String &name)
 Remove a column. More...
 
void renameColumn (const String &newname, const String &oldname)
 Rename a column. More...
 
uInt ncolumn () const
 Get number of columns. More...
 
Bool isColumn (const String &name) const
 Test if a column with this name exists. More...
 
Vector< StringcolumnNames () const
 Get a vector containing all column names. More...
 
const ColumnDesccolumnDesc (const String &name) const
 Get the column description by name or by index. More...
 
const ColumnDescoperator[] (const String &name) const
 
const ColumnDesccolumnDesc (uInt index) const
 
const ColumnDescoperator[] (uInt index) const
 
ColumnDescrwColumnDesc (const String &name)
 
ColumnDescrwColumnDesc (uInt index)
 
const Stringcomment () const
 Get comment string. More...
 
Stringcomment ()
 Get comment string (allowing it to be changed). More...
 
void show () const
 Show the table description on cout. More...
 
void show (ostream &os) const
 Show the table description. More...
 
const StringgetType () const
 Get the table type (i.e. More...
 
const Stringversion () const
 Get the table description version. More...
 
Bool isHypercolumn (const String &hypercolumnName) const
 Test if the given hypercolumn exists. More...
 
Vector< StringhypercolumnNames () const
 Get the names of all hypercolumns. More...
 
uInt hypercolumnDesc (const String &hypercolumnName, Vector< String > &dataColumnNames, Vector< String > &coordColumnNames, Vector< String > &idColumnNames) const
 Get the columns involved in a hypercolumn. More...
 
void adjustHypercolumns (const std::map< String, String > &old2new, Bool keepUnknownData=False, Bool keepUnknownCoord=False, Bool keppUnknownId=False)
 Adjust the hypercolumn definitions (for a RefTable). More...
 
void removeIDhypercolumns (const Vector< String > &hcNames)
 Remove ID-columns from the given hypercolumn definitions and set their default data manager type to IncrementalStMan and group to ISM_TSM. More...
 
void removeHypercolumnDesc (const String &hypercolumnName)
 Remove given hypercolumn definition. More...
 
void checkSubTableDesc () const
 Check recursively if the descriptions of all subtables are known. More...
 
void renameHypercolumn (const String &newHypercolumnName, const String &hypercolumnName)
 
void putFile (AipsIO &, const TableAttr &) const
 Put the table description into the file. More...
 
void getFile (AipsIO &, const TableAttr &)
 Get the table description from the file. More...
 
void defineHypercolumn (const String &hypercolumnName, uInt ndim, const Vector< String > &dataColumnNames)
 Define a hypercolumn. More...
 
void defineHypercolumn (const String &hypercolumnName, uInt ndim, const Vector< String > &dataColumnNames, const Vector< String > &coordColumnNames)
 
void defineHypercolumn (const String &hypercolumnName, uInt ndim, const Vector< String > &dataColumnNames, const Vector< String > &coordColumnNames, const Vector< String > &idColumnNames)
 

Static Public Member Functions

static Bool isReadable (const String &tableDescName)
 Test if a description file exists (i.e. More...
 

Private Member Functions

TableDescoperator= (const TableDesc &)
 Assignment is not supported, because it is impossible to define its semantics. More...
 
void init (const TabPath &)
 Initialize the table description. More...
 
void copy (const TableDesc &, const TabPath &, Bool copyColumns)
 Initialize and copy a table description. More...
 
void throwHypercolumn (const String &hyperColumnName, const String &message)
 Throw an invalid hypercolumn exception. More...
 

Private Attributes

String name_p
 
String vers_p
 
String dir_p
 
String comm_p
 
TableRecordkey_p
 
TableRecordprivKey_p
 
ColumnDescSet col_p
 
Bool swwrite_p
 
TDOption option_p
 
AipsIO iofil_p
 

Detailed Description

Define the structure of a Casacore table.

Intended use:

Public interface

Review Status

Reviewed By:
Paul Shannon
Date Reviewed:
1994/08/11
Test programs:
none

Prerequisite

Synopsis

A TableDesc object contains the description, or structure, of a table. This description is required for the creation of a new table. Descriptions are subsequently associated with every table and embedded in them.

A table description consists of the following items:

A TableDesc object can be constructed with one of the following options:

More information is provided in the Tables module documentation.

Example

// First build the new description of a subtable.
// Define columns ra and dec (double).
TableDesc subTableDesc("tTableDesc_sub", "1", TableDesc::New);
subTableDesc.addColumn (ScalarColumnDesc<double>("ra"));
subTableDesc.addColumn (ScalarColumnDesc<double>("dec"));
// Now create a new table description
// Define a comment for the table description.
// Define a double keyword.
ColumnDesc colDesc1, colDesc2;
TableDesc td("tTableDesc", "1", TableDesc::New);
td.comment() = "A test of class TableDesc";
td.rwKeywordSet().define ("equinox", 1950.0);
// Define an integer column ab using the TableDesc::addColumn
// function which creates a scalar column description.
td.addColumn (ScalarColumnDesc<Int>("ab", "Comment for column ab"));
// Add a scalar integer column ac, define keywords for it
// and define a default value 0.
// Overwrite the value of keyword unit.
ScalarColumnDesc<Int> acColumn("ac");
acColumn.rwKeywordSet().define ("scale", Complex(0.0f));
acColumn.rwKeywordSet().define ("unit", "");
acColumn.setDefault (0);
td.addColumn (acColumn);
td["ac"].rwKeywordSet().define ("unit", "DEG");
// Add a scalar string column ad and define its comment string.
td.addColumn (ScalarColumnDesc<String>("ad","comment for ad"));
// Now define array columns.
// This one is indirect and has no dimensionality mentioned yet.
td.addColumn (ArrayColumnDesc<Complex>("Arr1","comment for Arr1"));
// This one is indirect and has 3-dim arrays.
td.addColumn (ArrayColumnDesc<Int>("A2r1","comment for Arr1",3));
// This one is direct and has 2-dim arrays with axes length 4 and 7.
td.addColumn (ArrayColumnDesc<uInt>("Arr3","comment for Arr1",
IPosition(2,4,7),
// Add a columns containing tables.
td.addColumn (SubTableDesc("sub1", "subtable by name",
"tTableDesc_sub"));
// Define hypercolumn "dataCube".
td.addColumn (ArrayColumnDesc<Complex>("data",2));
td.addColumn (ArrayColumnDesc<Int>("pol",1));
td.addColumn (ArrayColumnDesc<float>("freq",1));
td.addColumn (ScalarColumnDesc<float>("time"));
td.addColumn (ScalarColumnDesc<float>("baseline"));
td.defineHypercolumn ("dataCube", 4,
stringToVector ("data"),
stringToVector ("pol,freq,time,baseline"));
}

Motivation

A table description specifies the structure, but not the contents, of a Casacore table. Since many tables will have identical structure and different content, it makes good sense to separate structure ("description") from content.

Definition at line 187 of file TableDesc.h.

Member Enumeration Documentation

Enumerator
Old 
New 
NewNoReplace 
Scratch 
Update 
Delete 

Definition at line 192 of file TableDesc.h.

Constructor & Destructor Documentation

casacore::TableDesc::TableDesc ( )

The default constructor creates a table description with option = Scratch and a blank name.

casacore::TableDesc::TableDesc ( const String type,
TDOption  = Old 
)

Create a table description object with the given name.

This name can be seen as the table type in the same way as a class name is the data type of an object. The name can only be blank when option=Scratch. The default table description path is used for the description file.

casacore::TableDesc::TableDesc ( const String type,
const String version,
TDOption  = Old 
)

Create a table description object with the given name (i.e.

table type) and version. The name can only be blank when option=Scratch. The default table description path is used for the description file.

casacore::TableDesc::TableDesc ( const String type,
const String version,
const TabPath ,
TDOption  = Old 
)

Create a table description object.

The given table description path is used for the description file. The name can only be blank with option=Scratch.

casacore::TableDesc::TableDesc ( const TableDesc ,
const String type,
const String version,
TDOption  ,
Bool  copyColumns = True 
)

Create a table description object with the given name (i.e.

table type) and version by copying the input table description. If the given name or version is blank, it will be copied from the input table description. The default table description path is used for the description file. The only options allowed are New, NewNoReplace and Scratch.

casacore::TableDesc::TableDesc ( const TableDesc ,
const String type,
const String version,
const TabPath ,
TDOption  ,
Bool  copyColumns = True 
)

Create a table description object with the given name (i.e.

table type) and version by copying the input table description. If the given name or version is blank, it will be copied from the input table description. The given table description path is used for the description file. The only options allowed are New, NewNoReplace and Scratch.

casacore::TableDesc::TableDesc ( const TableDesc ,
TDOption  = Scratch 
)

This copy constructor makes a copy of the table description maintaining its name and version.

By default a Scratch copy is made. It serves as a shorthand for the constructor:
TableDesc (const TableDesc&, "", "", TDOption);

casacore::TableDesc::~TableDesc ( )

The destructor writes the table description if changed.

Member Function Documentation

void casacore::TableDesc::add ( const TableDesc other,
Bool  addKeywordSet = True 
)

Add another table description to this table description.

It merges the column descriptions, the special keywordSet (containing hypercolumn definitions) and the user keywordSet (this last one is not added if the flag is False). The two table descriptions have to be disjoint, i.e. no column nor keyword should already exist. Otherwise an TableInvOper exception is thrown and nothing gets added.

ColumnDesc & casacore::TableDesc::addColumn ( const ColumnDesc column)
inline

Add a column to the table description.

An exception is thrown if a keyword or column with this name already exists. Although this function has a ColumnDesc as argument, it is usually needed to construct a more specialized object like ArrayColumnDesc<float>. A ColumnDesc constructor converts that automatically to a ColumnDesc object.

tableDesc.addColumn (ArrayColumnDesc<float> ("NAME"));

On the other hand this function can also be used to add a column description from another table as in:

tableDesc.addColumn (otherTableDesc.columnDesc("NAME"));

Definition at line 568 of file TableDesc.h.

References casacore::ColumnDescSet::addColumn(), and col_p.

Referenced by casa::NROOptionalTables::Generate_NRO_ARRAY().

ColumnDesc & casacore::TableDesc::addColumn ( const ColumnDesc column,
const String newname 
)
inline

Add a column to the table description and give it another name.

This may be useful to use a description of another column.

Definition at line 571 of file TableDesc.h.

References casacore::ColumnDescSet::addColumn(), and col_p.

void casacore::TableDesc::adjustHypercolumns ( const std::map< String, String > &  old2new,
Bool  keepUnknownData = False,
Bool  keepUnknownCoord = False,
Bool  keppUnknownId = False 
)

Adjust the hypercolumn definitions (for a RefTable).

It removes and/or renames columns as necessary. Column names which are not part of the map are removed if keepUnknown==False. If all data columns of a hypercolumn are removed, the entire hypercolumn is removed.

Referenced by casacore::SetupNewTable::adjustHypercolumns().

void casacore::TableDesc::checkSubTableDesc ( ) const
inline

Check recursively if the descriptions of all subtables are known.

Definition at line 586 of file TableDesc.h.

References casacore::ColumnDescSet::checkSubTableDesc(), and col_p.

const ColumnDesc & casacore::TableDesc::columnDesc ( const String name) const
inline

Get the column description by name or by index.

An exception is thrown if the column does not exist. Function isColumn should be used to test if a column exists.

Definition at line 533 of file TableDesc.h.

References col_p, and casa::name().

const ColumnDesc & casacore::TableDesc::columnDesc ( uInt  index) const
inline

Definition at line 537 of file TableDesc.h.

References col_p.

const ColumnDescSet & casacore::TableDesc::columnDescSet ( ) const
inline

Get access to the set of column descriptions.

In this way const ColumnDescSet functions (e.g. isDisjoint) can be used.

Definition at line 564 of file TableDesc.h.

References col_p.

Vector<String> casacore::TableDesc::columnNames ( ) const

Get a vector containing all column names.

const String & casacore::TableDesc::comment ( ) const
inline

Get comment string.

Definition at line 580 of file TableDesc.h.

References comm_p.

String & casacore::TableDesc::comment ( )
inline

Get comment string (allowing it to be changed).

Definition at line 583 of file TableDesc.h.

References comm_p.

void casacore::TableDesc::copy ( const TableDesc ,
const TabPath ,
Bool  copyColumns 
)
private

Initialize and copy a table description.

void casacore::TableDesc::defineHypercolumn ( const String hypercolumnName,
uInt  ndim,
const Vector< String > &  dataColumnNames 
)

Define a hypercolumn.

A hypercolumn is a group of one or more data columns of which the data is treated as one or more (regular) hypercubes. The hypercolumn has coordinate axes (e.g. time, frequency) which are columns in the table. When the entire hypercolumn consists of multiple hypercubes, ID-columns can be defined, which uniquely determine the hypercube to be used. Note that only TiledDataStMan requires the use of ID-columns. A hypercolumn definition is needed to be able to use a Tiled Storage Manager.

The following has to be specified:

Hypercolumn name
which is the name used to refer to the hypercolumn.
ndim
defining the dimensionality of the hypercolumn (and of its hypercube(s)).
Data column names
which are the columns containing the hypercube data. When multiple columns are used, the shapes of the data in their cells must be the same in the same row. All data columns must contain numeric or Bool scalars or arrays.
array:
Its dimensionality has to be less than or equal to the dimensionality of the hypercolumn. If equal, the array itself already forms the hypercube. That would mean that each row is a hypercube. If less, the arrays from multiple rows form a hypercube, adding one or more dimensions to the array dimensionality.
scalar:
The data from multiple rows form a hypercube. Not all tiled storage managers support scalars.
Coordinate column names (optional)
which are the columns containing the coordinates of the hypercubes. They must be (u)Int, float, double or (D)Complex. When given, the number of coordinate columns must match the dimensionality of the hypercolumn.
When the data column cells contain arrays, the first N coordinate columns must contain vector values, where N is the dimensionality of the data arrays. The remaining coordinate columns must contain scalar values.
Id column names (optional)
have to be given when a hypercolumn can consist of multiple hypercubes. They define the column(s) determining which hypercube has to be used for a data array. The id columns must contain scalar values ((u)Int, float, double, (D)Complex, String and/or Bool).

It will be checked if the given columns exists and have an appropriate type.
The default data manager type of the columns involved will be set to TiledColumnStMan if all data columns have a fixed shape. Otherwise they are set to TiledShapeStMan. The storage manager group of all columns involved will be set to the hypercolumn name. In that way binding columns to storage managers during the table creation process is easier because a simple bindGroup can be used.

For example:
A table contains data matrices with axes pol and freq. Those axes are defined in columns pol and freq containing vectors with the same length as the corresponding axis. The table also contains scalar columns time and baseline, which superimpose dimensions upon the data. So the data will be stored in a 4-d hypercube with axes pol,freq,time,baseline. It would be defined as follows:

tableDesc.defineHypercolumn ("dataCube", 4,
stringToVector ("data"),
stringToVector ("pol,freq,time,baseline"));

Note that the function stringToVector is very convenient for creating a vector of Strings.

void casacore::TableDesc::defineHypercolumn ( const String hypercolumnName,
uInt  ndim,
const Vector< String > &  dataColumnNames,
const Vector< String > &  coordColumnNames 
)
void casacore::TableDesc::defineHypercolumn ( const String hypercolumnName,
uInt  ndim,
const Vector< String > &  dataColumnNames,
const Vector< String > &  coordColumnNames,
const Vector< String > &  idColumnNames 
)
void casacore::TableDesc::getFile ( AipsIO ,
const TableAttr  
)

Get the table description from the file.

const String & casacore::TableDesc::getType ( ) const
inline

Get the table type (i.e.

name of table description).

Definition at line 548 of file TableDesc.h.

References name_p.

uInt casacore::TableDesc::hypercolumnDesc ( const String hypercolumnName,
Vector< String > &  dataColumnNames,
Vector< String > &  coordColumnNames,
Vector< String > &  idColumnNames 
) const

Get the columns involved in a hypercolumn.

It returns the dimensionality of the hypercolumn. An exception is thrown if the hypercolumn does not exist.

Vector<String> casacore::TableDesc::hypercolumnNames ( ) const

Get the names of all hypercolumns.

void casacore::TableDesc::init ( const TabPath )
private

Initialize the table description.

Bool casacore::TableDesc::isColumn ( const String name) const
inline

Test if a column with this name exists.

Definition at line 529 of file TableDesc.h.

References col_p, and casacore::ColumnDescSet::isDefined().

Bool casacore::TableDesc::isHypercolumn ( const String hypercolumnName) const

Test if the given hypercolumn exists.

static Bool casacore::TableDesc::isReadable ( const String tableDescName)
static

Test if a description file exists (i.e.

isReadable).

const TableRecord & casacore::TableDesc::keywordSet ( ) const
inline

Definition at line 558 of file TableDesc.h.

References key_p.

uInt casacore::TableDesc::ncolumn ( ) const
inline

Get number of columns.

Definition at line 525 of file TableDesc.h.

References col_p, and casacore::ColumnDescSet::ncolumn().

TableDesc& casacore::TableDesc::operator= ( const TableDesc )
private

Assignment is not supported, because it is impossible to define its semantics.

Does the data need to be written into a file before being overwritten? Declaring it private, makes it unusable.

const ColumnDesc & casacore::TableDesc::operator[] ( const String name) const
inline

Definition at line 535 of file TableDesc.h.

References col_p, and casa::name().

const ColumnDesc & casacore::TableDesc::operator[] ( uInt  index) const
inline

Definition at line 539 of file TableDesc.h.

References col_p.

const TableRecord & casacore::TableDesc::privateKeywordSet ( ) const
inline

Get readonly access to the private set of keywords.

Definition at line 560 of file TableDesc.h.

References privKey_p.

void casacore::TableDesc::putFile ( AipsIO ,
const TableAttr  
) const

Put the table description into the file.

The name can be used to write the TableDesc from a Table and is used to set the names of subtables correctly.

void casacore::TableDesc::removeColumn ( const String name)
inline

Remove a column.

An exception is thrown if the column does not exist.

Definition at line 576 of file TableDesc.h.

References col_p, and casacore::ColumnDescSet::remove().

void casacore::TableDesc::removeHypercolumnDesc ( const String hypercolumnName)

Remove given hypercolumn definition.

An exception is thrown if it is not a hypercolumn.

void casacore::TableDesc::removeIDhypercolumns ( const Vector< String > &  hcNames)

Remove ID-columns from the given hypercolumn definitions and set their default data manager type to IncrementalStMan and group to ISM_TSM.

void casacore::TableDesc::renameColumn ( const String newname,
const String oldname 
)

Rename a column.

An exception is thrown if the old name does not exist or if the name already exists.
Caution: Renaming a column should be done with care, because other columns may be referring this column; Also a hypercolumn definition might be using the old name;

void casacore::TableDesc::renameHypercolumn ( const String newHypercolumnName,
const String hypercolumnName 
)
ColumnDesc & casacore::TableDesc::rwColumnDesc ( const String name)
inline

Definition at line 541 of file TableDesc.h.

References col_p, and casa::name().

ColumnDesc & casacore::TableDesc::rwColumnDesc ( uInt  index)
inline

Definition at line 543 of file TableDesc.h.

References col_p.

TableRecord & casacore::TableDesc::rwKeywordSet ( )
inline

Get access to the keyword set.

Definition at line 556 of file TableDesc.h.

References key_p.

void casacore::TableDesc::show ( ) const

Show the table description on cout.

void casacore::TableDesc::show ( ostream &  os) const

Show the table description.

void casacore::TableDesc::throwHypercolumn ( const String hyperColumnName,
const String message 
)
private

Throw an invalid hypercolumn exception.

const String & casacore::TableDesc::version ( ) const
inline

Get the table description version.

Definition at line 552 of file TableDesc.h.

References vers_p.

Member Data Documentation

ColumnDescSet casacore::TableDesc::col_p
private
String casacore::TableDesc::comm_p
private

Definition at line 486 of file TableDesc.h.

Referenced by comment().

String casacore::TableDesc::dir_p
private

Definition at line 485 of file TableDesc.h.

AipsIO casacore::TableDesc::iofil_p
private

Definition at line 494 of file TableDesc.h.

TableRecord* casacore::TableDesc::key_p
private

Definition at line 489 of file TableDesc.h.

Referenced by keywordSet(), and rwKeywordSet().

String casacore::TableDesc::name_p
private

Definition at line 483 of file TableDesc.h.

Referenced by getType().

TDOption casacore::TableDesc::option_p
private

Definition at line 493 of file TableDesc.h.

TableRecord* casacore::TableDesc::privKey_p
private

Definition at line 490 of file TableDesc.h.

Referenced by privateKeywordSet().

Bool casacore::TableDesc::swwrite_p
private

Definition at line 492 of file TableDesc.h.

String casacore::TableDesc::vers_p
private

Definition at line 484 of file TableDesc.h.

Referenced by version().


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