Package nom.tam.fits.compression.algorithm.gzip

Class GZipCompressor<T extends Buffer>

java.lang.Object

nom.tam.fits.compression.algorithm.gzip.GZipCompressor<T>

Type Parameters:

T - The genetic type of element buffer to compress

All Implemented Interfaces:

ICompressor<T>

Direct Known Subclasses:

GZip2Compressor, GZipCompressor.ByteGZipCompressor, GZipCompressor.DoubleGZipCompressor, GZipCompressor.FloatGZipCompressor, GZipCompressor.IntGZipCompressor, GZipCompressor.LongGZipCompressor, GZipCompressor.ShortGZipCompressor

public abstract class GZipCompressor<T extends Buffer>
extends Object
implements ICompressor<T>

(for internal use) The GZIP compression algorithm.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	GZipCompressor.ByteGZipCompressor	Byte compress is a special case, the only one that does not extends GZipCompress because it can write the buffer directly.
static class	GZipCompressor.DoubleGZipCompressor
static class	GZipCompressor.FloatGZipCompressor
static class	GZipCompressor.IntGZipCompressor
static class	GZipCompressor.LongGZipCompressor
static class	GZipCompressor.ShortGZipCompressor

Field Summary

Fields

Modifier and Type	Field	Description
protected byte[]	buffer
protected T	nioBuffer
protected final int	primitiveSize

Constructor Summary

Constructors

Constructor	Description
GZipCompressor(int primitiveSize)

Method Summary

Modifier and Type	Method	Description
boolean	compress(T pixelData, ByteBuffer compressed)	compress the buffer into the byte buffer.
protected GZIPInputStream	createGZipInputStream(ByteBuffer compressed)
protected GZIPOutputStream	createGZipOutputStream(int length, ByteBuffer compressed)
void	decompress(ByteBuffer compressed, T pixelData)	Decompress the byte buffer and restore the buffer from it, again enough space must already be allocated.
protected abstract void	getPixel(T pixelData, byte[] pixelBytes)
protected abstract void	setPixel(T pixelData, byte[] pixelBytes)

Methods inherited from class java.lang.Object

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

Field Details

primitiveSize

protected final int primitiveSize

buffer

protected byte[] buffer

nioBuffer

protected T extends Buffer nioBuffer

Constructor Details

GZipCompressor

public GZipCompressor(int primitiveSize)

Method Details

compress

public boolean compress(T pixelData,
 ByteBuffer compressed)

Description copied from interface: ICompressor

compress the buffer into the byte buffer. Attention enough space must already be allocated.

Specified by:

compress in interface ICompressor<T extends Buffer>

Parameters:

pixelData - the buffer to compress.

compressed - the compressed data

Returns:

true if the compression succeeded.

decompress

public void decompress(ByteBuffer compressed,
 T pixelData)

Description copied from interface: ICompressor

Decompress the byte buffer and restore the buffer from it, again enough space must already be allocated.

Specified by:

decompress in interface ICompressor<T extends Buffer>

Parameters:

compressed - the compressed data

pixelData - the buffer to fill with the uncompressed data.

createGZipInputStream

protected GZIPInputStream createGZipInputStream(ByteBuffer compressed)
                                         throws IOException

Throws:

IOException

createGZipOutputStream

protected GZIPOutputStream createGZipOutputStream(int length,
 ByteBuffer compressed)
                                           throws IOException

Throws:

IOException

getPixel

protected abstract void getPixel(T pixelData,
 byte[] pixelBytes)

setPixel

protected abstract void setPixel(T pixelData,
 byte[] pixelBytes)