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

Class GZipCompressor<T extends java.nio.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 java.nio.Buffer>
extends java.lang.Object
implements ICompressor<T>

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
private class	GZipCompressor.TypeConversion<B extends java.nio.Buffer>

Field Summary

Fields

Modifier and Type	Field	Description
protected byte[]	buffer
private static int	DEFAULT_GZIP_BUFFER_SIZE
private static int	MINIMAL_GZIP_BUFFER_SIZE
protected T	nioBuffer
protected int	primitiveSize
private byte[]	sizeArray
private java.nio.IntBuffer	sizeBuffer

Constructor Summary

Constructors

Constructor	Description
GZipCompressor(int primitiveSize)

Method Summary

Modifier and Type	Method	Description
boolean	compress(T pixelData, java.nio.ByteBuffer compressed)	compress the buffer into the byte buffer.
protected java.util.zip.GZIPInputStream	createGZipInputStream(java.nio.ByteBuffer compressed)
protected java.util.zip.GZIPOutputStream	createGZipOutputStream(int length, java.nio.ByteBuffer compressed)
void	decompress(java.nio.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)
private <B extends java.nio.Buffer> PrimitiveType<B>	getPrimitiveType(int size)
private GZipCompressor.TypeConversion<java.nio.Buffer>	getTypeConverter(java.nio.ByteBuffer compressed, int nrOfPrimitiveElements)
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

DEFAULT_GZIP_BUFFER_SIZE

private static final int DEFAULT_GZIP_BUFFER_SIZE

See Also:

Constant Field Values

MINIMAL_GZIP_BUFFER_SIZE

private static final int MINIMAL_GZIP_BUFFER_SIZE

See Also:

Constant Field Values

primitiveSize

protected final int primitiveSize

buffer

protected byte[] buffer

nioBuffer

protected T extends java.nio.Buffer nioBuffer

sizeArray

private final byte[] sizeArray

sizeBuffer

private final java.nio.IntBuffer sizeBuffer

Constructor Detail

GZipCompressor

public GZipCompressor(int primitiveSize)

Method Detail

compress

public boolean compress(T pixelData,
                        java.nio.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 java.nio.Buffer>

Parameters:

pixelData - the buffer to compress.

compressed - the compressed data

Returns:

true if the compression succeeded.

decompress

public void decompress(java.nio.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 java.nio.Buffer>

Parameters:

compressed - the compressed data

pixelData - the buffer to fill with the uncompressed data.

getPrimitiveType

private <B extends java.nio.Buffer> PrimitiveType<B> getPrimitiveType(int size)

getTypeConverter

private GZipCompressor.TypeConversion<java.nio.Buffer> getTypeConverter(java.nio.ByteBuffer compressed,
                                                                        int nrOfPrimitiveElements)

createGZipInputStream

protected java.util.zip.GZIPInputStream createGZipInputStream(java.nio.ByteBuffer compressed)
                                                       throws java.io.IOException

Throws:

java.io.IOException

createGZipOutputStream

protected java.util.zip.GZIPOutputStream createGZipOutputStream(int length,
                                                                java.nio.ByteBuffer compressed)
                                                         throws java.io.IOException

Throws:

java.io.IOException

getPixel

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

setPixel

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