nom.tam.fits
Class Data

java.lang.Object
  nom.tam.fits.Data

All Implemented Interfaces:

FitsElement

Direct Known Subclasses:

AsciiTable, BinaryTable, ImageData, RandomGroupsData, UndefinedData

public abstract class Data
extends java.lang.Object
implements FitsElement

This class provides methods to access the data segment of an HDU.

Field Summary

protected int	dataSize The size of the data when last read
protected long	fileOffset The starting location of the data when last read
protected RandomAccess	input The inputstream used.

Constructor Summary

Data()

Method Summary

abstract java.lang.Object	getData() Return the data array object.
long	getFileOffset() Get the file offset
java.lang.Object	getKernel() Return the non-FITS data object
long	getSize() Get the size of the data element in bytes
abstract void	read(ArrayDataInput i) Read a data array into the current object and if needed position to the beginning of the next FITS block.
void	rewrite() Rewrite the contents of the element in place.
boolean	rewriteable() Can this element be rewritten?
protected void	setFileOffset(java.lang.Object o) Set the fields needed for a re-read
abstract void	write(ArrayDataOutput o) Write the data -- including any buffering needed

Methods inherited from class java.lang.Object

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

Field Detail

fileOffset

protected long fileOffset

The starting location of the data when last read

dataSize

protected int dataSize

The size of the data when last read

input

protected RandomAccess input

The inputstream used.

Constructor Detail

Data

public Data()

Method Detail

getFileOffset

public long getFileOffset()

Get the file offset

Specified by:

getFileOffset in interface FitsElement

setFileOffset

protected void setFileOffset(java.lang.Object o)

Set the fields needed for a re-read

write

public abstract void write(ArrayDataOutput o)
                    throws FitsException

Write the data -- including any buffering needed

Specified by:

write in interface FitsElement

Parameters:

o - The output stream on which to write the data.

Throws:

FitsException

read

public abstract void read(ArrayDataInput i)
                   throws FitsException

Read a data array into the current object and if needed position to the beginning of the next FITS block.

Specified by:

read in interface FitsElement

Parameters:

i - The input data stream

Throws:

FitsException

rewrite

public void rewrite()
             throws FitsException

Description copied from interface: FitsElement

Rewrite the contents of the element in place. The data must have been orignally read from a random access device, and the size of the element may not have changed.

Specified by:

rewrite in interface FitsElement

Throws:

FitsException

rewriteable

public boolean rewriteable()

Description copied from interface: FitsElement

Can this element be rewritten?

Specified by:

rewriteable in interface FitsElement

getSize

public long getSize()

Get the size of the data element in bytes

Specified by:

getSize in interface FitsElement

getData

public abstract java.lang.Object getData()
                                  throws FitsException

Return the data array object.

Throws:

FitsException

getKernel

public java.lang.Object getKernel()
                           throws FitsException

Return the non-FITS data object

Throws:

FitsException