uk.ac.starlink.fits

Class AsciiTableStarTable

java.lang.Object

uk.ac.starlink.table.AbstractStarTable

uk.ac.starlink.fits.AsciiTableStarTable

All Implemented Interfaces:

Closeable, AutoCloseable, StarTable

public abstract class AsciiTableStarTable
extends AbstractStarTable

StarTable implementation for FITS (ASCII) TABLE extensions.

Since:

4 Mar 2022

Author:

Mark Taylor

Constructor Summary

Constructors

Constructor and Description
AsciiTableStarTable(FitsHeader hdr) Constructor.

Method Summary

Modifier and Type	Method and Description
static AsciiTableStarTable	createTable(FitsHeader hdr, InputFactory inputFact) Creates a table instance from a TABLE HDU.
int	getColumnCount() Returns the number of columns in this table.
ColumnInfo	getColumnInfo(int icol) Returns the object describing the data in a given column.
protected int[]	getColumnLengths() Returns the array of column lengths in bytes.
protected int[]	getColumnOffsets() Returns the array of column offsets from the start of the row.
long	getRowCount() Returns the number of rows in this table, if known.
protected int	getRowLength() Returns the length of each row in bytes.
protected Object	readCell(byte[] cellBuf, int icol) Reads the content of a cell of this table from a byte buffer.
protected Object[]	readRow(byte[] rowBuf) Reads the content of a row of this table from a byte buffer.
static void	streamStarTable(FitsHeader hdr, BasicInput input, TableSink sink) Reads a TABLE HDU from a stream and writes the result to a table sink.

Methods inherited from class uk.ac.starlink.table.AbstractStarTable

checkedLongToInt, close, getCell, getColumnAuxDataInfos, getName, getParameters, getRow, getRowAccess, getRowSequence, getRowSplittable, getURL, isRandom, setName, setParameters, setURL

Methods inherited from class java.lang.Object

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

Methods inherited from interface uk.ac.starlink.table.StarTable

getParameterByName, setParameter

Constructor Detail

AsciiTableStarTable

public AsciiTableStarTable(FitsHeader hdr)
                    throws IOException

Constructor.

Parameters:

hdr - ASCII TABLE extension header

Throws:

IOException

Method Detail

getRowCount

public long getRowCount()

Description copied from interface: StarTable

Returns the number of rows in this table, if known. If the number of rows cannot be (easily) determined, a value of -1 will be returned.

Specified by:

getRowCount in interface StarTable

Specified by:

getRowCount in class AbstractStarTable

Returns:

the number of rows, or -1

getColumnCount

public int getColumnCount()

Description copied from interface: StarTable

Returns the number of columns in this table.

Specified by:

getColumnCount in interface StarTable

Specified by:

getColumnCount in class AbstractStarTable

Returns:

the number of columns

getColumnInfo

public ColumnInfo getColumnInfo(int icol)

Description copied from interface: StarTable

Returns the object describing the data in a given column.

Specified by:

getColumnInfo in interface StarTable

Specified by:

getColumnInfo in class AbstractStarTable

Parameters:

icol - the column for which header information is required

Returns:

a ValueInfo object for column icol

getRowLength

protected int getRowLength()

Returns the length of each row in bytes.

Returns:

row length

getColumnOffsets

protected int[] getColumnOffsets()

Returns the array of column offsets from the start of the row.

Returns:

ncol-length array of byte offsets from row start

getColumnLengths

protected int[] getColumnLengths()

Returns the array of column lengths in bytes.

Returns:

ncol-length array of field byte lengths

readRow

protected Object[] readRow(byte[] rowBuf)

Reads the content of a row of this table from a byte buffer.

Parameters:

rowBuf - buffer containing rowLeng bytes

Returns:

ncol-element array of cell values

readCell

protected Object readCell(byte[] cellBuf,
                          int icol)

Reads the content of a cell of this table from a byte buffer.

Parameters:

cellBuf - buffer containing bytes for column content

icol - column index

Returns:

cell value

createTable

public static AsciiTableStarTable createTable(FitsHeader hdr,
                                              InputFactory inputFact)
                                       throws IOException

Creates a table instance from a TABLE HDU.

Parameters:

hdr - FITS header for ASCII table

inputFact - input factory for Data part of HDU

Returns:

new table; it will be random-access according to whether the input factory is

Throws:

IOException

streamStarTable

public static void streamStarTable(FitsHeader hdr,
                                   BasicInput input,
                                   TableSink sink)
                            throws IOException

Reads a TABLE HDU from a stream and writes the result to a table sink.

Parameters:

hdr - FITS header object describing the TABLE extension

input - input stream positioned at the start of the data part of the TABLE extension

sink - destination for the table

Throws:

IOException