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java.lang.Object nom.tam.fits.Data nom.tam.fits.ImageData
public class ImageData
This class instantiates FITS primary HDU and IMAGE extension data. Essentially these data are a primitive multi-dimensional array.
Starting in version 0.9 of the FITS library, this routine allows users to defer the reading of images if the FITS data is being read from a file. An ImageTiler object is supplied which can return an arbitrary subset of the image as a one dimensional array -- suitable for manipulation by standard Java libraries. A call to the getData() method will still return a multi-dimensional array, but the image data will not be read until the user explicitly requests. it.
Nested Class Summary | |
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protected class |
ImageData.ArrayDesc
This class describes an array |
protected class |
ImageData.ImageDataTiler
This inner class allows the ImageTiler to see if the user has read in the data. |
Field Summary |
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Fields inherited from class nom.tam.fits.Data |
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dataSize, fileOffset, input |
Constructor Summary | |
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ImageData()
Create the equivalent of a null data element. |
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ImageData(Header h)
Create an array from a header description. |
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ImageData(java.lang.Object x)
Create an ImageData object using the specified object to initialize the data array. |
Method Summary | |
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protected void |
fillHeader(Header head)
Fill header with keywords that describe image data. |
java.lang.Object |
getData()
Return the actual data. |
ImageTiler |
getTiler()
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protected int |
getTrueSize()
Get the size in bytes of the data |
protected ImageData.ArrayDesc |
parseHeader(Header h)
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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 |
write(ArrayDataOutput o)
Write the data -- including any buffering needed |
Methods inherited from class nom.tam.fits.Data |
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getFileOffset, getKernel, getSize, rewrite, rewriteable, setFileOffset |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public ImageData(Header h) throws FitsException
h
- header to be used as a template.
FitsException
- if there was a problem with the header description.public ImageData()
public ImageData(java.lang.Object x)
x
- The initial data array. This should be a primitive
array but this is not checked currently.Method Detail |
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protected ImageData.ArrayDesc parseHeader(Header h) throws FitsException
FitsException
protected void fillHeader(Header head) throws FitsException
head
- The FITS header
FitsException
- if the object does not contain
valid image data.public void read(ArrayDataInput i) throws FitsException
Data
read
in interface FitsElement
read
in class Data
i
- The input data stream
FitsException
public void write(ArrayDataOutput o) throws FitsException
Data
write
in interface FitsElement
write
in class Data
o
- The output stream on which to write the data.
FitsException
protected int getTrueSize()
public java.lang.Object getData()
getData
in class Data
public ImageTiler getTiler()
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