nom.tam.fits.compression.algorithm.gzip

Class GZipCompressor<T extends Buffer>

java.lang.Object

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

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>

Nested Class Summary

Nested Classes

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

Constructor Summary

Constructors

Constructor and Description
GZipCompressor(int primitiveSize)

Method Summary

Modifier and Type	Method and 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 Detail

primitiveSize

protected final int primitiveSize

buffer

protected byte[] buffer

nioBuffer

protected T extends Buffer nioBuffer

Constructor Detail

GZipCompressor

public GZipCompressor(int primitiveSize)

Method Detail

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)