uk.ac.starlink.fits

Class ColFitsTableSerializer

java.lang.Object

uk.ac.starlink.fits.ColFitsTableSerializer

All Implemented Interfaces:

FitsTableSerializer

public class ColFitsTableSerializer
extends Object
implements FitsTableSerializer

Object which can serialize a StarTable to a data stream as a one-row FITS file in which each element contains an entire column of the table.

Since:

26 Jun 2006

Author:

Mark Taylor

Constructor Summary

Constructors

Constructor and Description
ColFitsTableSerializer(FitsTableSerializerConfig config, StarTable table) Constructor.

Method Summary

Modifier and Type	Method and Description
String	getBadValue(int icol) Returns the bad value (text of the TNULLnn card), if any, used for a given column.
int[]	getDimensions(int icol) Returns the dimensions of the items which will be output for a given column.
char	getFormatChar(int icol) Returns the FITS TFORM letter which describes the type of data output for a given column.
CardImage[]	getHeader() Returns header cards suitable for the HDU which will contain the table.
long	getRowCount() Returns the number of rows which will be output.
void	writeData(DataOutput out) Write the FITS data unit populated by this serializer.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ColFitsTableSerializer

public ColFitsTableSerializer(FitsTableSerializerConfig config,
                              StarTable table)
                       throws IOException

Constructor.

Parameters:

config - configuration

table - table to serialize

Throws:

IOException - if it won't be possible to write the given table

Method Detail

getHeader

public CardImage[] getHeader()

Description copied from interface: FitsTableSerializer

Returns header cards suitable for the HDU which will contain the table. Additional metadata and an END marker will be added after these cards, so the returned array must not contain the END card.

Specified by:

getHeader in interface FitsTableSerializer

Returns:

header cards

writeData

public void writeData(DataOutput out)
               throws IOException

Write the FITS data unit populated by this serializer.

Specified by:

writeData in interface FitsTableSerializer

Parameters:

out - destination stream

Throws:

IOException

getRowCount

public long getRowCount()

Description copied from interface: FitsTableSerializer

Returns the number of rows which will be output.

Specified by:

getRowCount in interface FitsTableSerializer

Returns:

row count

getFormatChar

public char getFormatChar(int icol)

Description copied from interface: FitsTableSerializer

Returns the FITS TFORM letter which describes the type of data output for a given column. This is as described by the FITS standard - 'J' for 4-byte integer, 'A' for characters, etc. If the column is not being output, (char)0 will be returned.

Specified by:

getFormatChar in interface FitsTableSerializer

Parameters:

icol - column to query

Returns:

format letter for data in column icol, or 0 for a column being skipped

getDimensions

public int[] getDimensions(int icol)

Description copied from interface: FitsTableSerializer

Returns the dimensions of the items which will be output for a given column. This will be null only if that column is not being output. Otherwise it will be a zero-element array for a scalar, 1-element array for a vector, etc.

Specified by:

getDimensions in interface FitsTableSerializer

Parameters:

icol - column to query

Returns:

dimensions array for data in column icol or null for a column being skipped

getBadValue

public String getBadValue(int icol)

Description copied from interface: FitsTableSerializer

Returns the bad value (text of the TNULLnn card), if any, used for a given column.

Specified by:

getBadValue in interface FitsTableSerializer

Parameters:

icol - column to query

Returns:

blank value string, or null if there is none or the column is being skipped