nom.tam.fits
Class Data

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

Direct Known Subclasses:

BinaryTable, ImageData, RandomGroupsData

public abstract class Data

extends Object

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

Field Summary

protected Object

dataArray This is the object which contains the actual data for the HDU.

Constructor Summary

Data()

Method Summary

Object	getData() Return the data array object.
int	getPaddedSize() Get the size of the entire data area including any padding.
int	getPadding() Get the amount of padding needed to fill in or skip to the beginning of the next FITS block.
int	getTrueSize() Get the size of the actual data elements.
void	read(BufferedDataInputStream i) Read a data array into the current object and if needed position to the beginning of the next FITS block.
protected void	readTrueData(BufferedDataInputStream i) Read in the actual data portion.
void	write(BufferedDataOutputStream o) Write the data -- including any buffering needed
protected void	writeTrueData(BufferedDataOutputStream o) Write only the actual data.

Methods inherited from class java.lang.Object

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

Field Detail

dataArray

protected Object dataArray

This is the object which contains the actual data for the HDU.

• For images and primary data this is a simple (but possibly multi-dimensional) primitive array. When group data is supported it will be a possibly multidimensional array of group objects.
• For ASCII data it is a two dimensional Object array where each of the constituent objects is a primitive array of length 1.
• For Binary data it is a two dimensional Object array where each of the constituent objects is a primitive array of arbitrary (more or less) dimensionality.

Constructor Detail

Data

public Data()

Method Detail

write

public void write(BufferedDataOutputStream o)
           throws FitsException

Write the data -- including any buffering needed

Parameters:

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

Throws:

FitsException

read

public void read(BufferedDataInputStream i)
          throws FitsException

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

Parameters:

i - The input data stream

Throws:

FitsException

writeTrueData

protected void writeTrueData(BufferedDataOutputStream o)
                      throws FitsException

Write only the actual data.

Parameters:

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

Throws:

FitsException

readTrueData

protected void readTrueData(BufferedDataInputStream i)
                     throws FitsException

Read in the actual data portion. This method needs to be overriden for ASCII tables and for binary tables with variable length data.

Parameters:

i - The input stream.

Throws:

FitsException

getPadding

public int getPadding()

Get the amount of padding needed to fill in or skip to the beginning of the next FITS block.

getTrueSize

public int getTrueSize()

Get the size of the actual data elements.

getPaddedSize

public int getPaddedSize()

Get the size of the entire data area including any padding.

getData

public Object getData()

Return the data array object.