IO Handler for Isis Cubes using the tile format. More...

#include <CubeTileHandler.h>

Inheritance diagram for Isis::CubeTileHandler:

Collaboration diagram for Isis::CubeTileHandler:

Public Member Functions
	CubeTileHandler (QFile dataFile, const QList< int > virtualBandList, const Pvl &label, bool alreadyOnDisk)
	Construct a tile handler.

	~CubeTileHandler ()
	Writes all data from memory to disk.

void	updateLabels (Pvl &label)
	Update the cube labels so that this cube indicates what tile size it used.

void	read (Buffer &bufferToFill) const
	Read cube data from disk into the buffer.

void	write (const Buffer &bufferToWrite)
	Write buffer data into the cube data on disk.

void	addCachingAlgorithm (CubeCachingAlgorithm *algorithm)
	This will add the given caching algorithm to the list of attempted caching algorithms.

void	clearCache (bool blockForWriteCache=true) const
	Free all cube chunks (cached cube data) from memory and write them to disk.

BigInt	getDataSize () const

void	setVirtualBands (const QList< int > *virtualBandList)
	This changes the virtual band list.

QMutex *	dataFileMutex ()
	Get the mutex that this IO handler is using around I/Os on the given data file.

Protected Member Functions
virtual void	readRaw (RawCubeChunk &chunkToFill)
	This needs to populate the chunkToFill with unswapped raw bytes from the disk.

virtual void	writeRaw (const RawCubeChunk &chunkToWrite)
	This needs to write the chunkToWrite directly to disk with no modifications to the data itself.

int	bandCount () const

int	getBandCountInChunk () const

BigInt	getBytesPerChunk () const

int	getChunkCountInBandDimension () const

int	getChunkCountInLineDimension () const

int	getChunkCountInSampleDimension () const

int	getChunkIndex (const RawCubeChunk &) const
	Given a chunk, what's its index in the file.

BigInt	getDataStartByte () const

QFile *	getDataFile ()

int	lineCount () const

int	getLineCountInChunk () const

PixelType	pixelType () const

int	sampleCount () const

int	getSampleCountInChunk () const

void	setChunkSizes (int numSamples, int numLines, int numBands)
	This should be called once from the child constructor.

Private Member Functions
	CubeTileHandler (const CubeTileHandler &other)
	Disallow copying of this object.

CubeTileHandler &	operator= (const CubeTileHandler &other)
	Disallow assignments of this object.

int	findGoodSize (int maxSize, int dimensionSize) const
	This is a helper method that tries to compute a good tile size for one of the cube's dimensions (sample or line).

BigInt	getTileStartByte (const RawCubeChunk &chunk) const
	This is a helper method that goes from chunk to file position.

Detailed Description

IO Handler for Isis Cubes using the tile format.

This class is used to open, create, read, and write data from Isis cube files.

Author: 2003-02-14 Jeff Anderson

History:

2007-09-14 Stuart Sides - Fixed bug where pixels from a buffer outside the ns/nl were being transfered to the right most and bottom most tiles

2011-06-16 Jai Rideout and Steven Lambright - Refactored to work with the new parent.

2011-07-18 Jai Rideout and Steven Lambright - Added unimplemented copy constructor and assignment operator.

Definition at line 52 of file CubeTileHandler.h.

Constructor & Destructor Documentation

Isis::CubeTileHandler::CubeTileHandler	(	QFile *	dataFile,
		const QList< int > *	virtualBandList,
		const Pvl &	labels,
		bool	alreadyOnDisk
	)

Construct a tile handler.

This will determine a good chunk size to put into the output cube.

Parameters

dataFile	The file with cube DN data in it
virtualBandList	The mapping from virtual band to physical band, see CubeIoHandler's description.
labels	The Pvl labels for the cube
alreadyOnDisk	True if the cube is allocated on the disk, false otherwise

Definition at line 48 of file CubeTileHandler.cpp.

References findGoodSize(), Isis::PvlObject::findObject(), Isis::PvlObject::hasKeyword(), Isis::CubeIoHandler::lineCount(), Isis::CubeIoHandler::pixelType(), Isis::CubeIoHandler::sampleCount(), Isis::CubeIoHandler::setChunkSizes(), and Isis::SizeOf().

Isis::CubeTileHandler::~CubeTileHandler ( )

Writes all data from memory to disk.

Definition at line 72 of file CubeTileHandler.cpp.

References Isis::CubeIoHandler::clearCache().

Isis::CubeTileHandler::CubeTileHandler ( const CubeTileHandler & other )

private

Disallow copying of this object.

Parameters

other The object to copy.

Member Function Documentation

void Isis::CubeIoHandler::addCachingAlgorithm ( CubeCachingAlgorithm * algorithm )

inherited

This will add the given caching algorithm to the list of attempted caching algorithms.

The algorithms are tried in the opposite order that they were added - the first algorithm added is the last algorithm tried.

This method takes ownership of algorithm.

Parameters

algorithm The caching algorithm to add to the Cube for I/O

Definition at line 384 of file CubeIoHandler.cpp.

int Isis::CubeIoHandler::bandCount ( ) const

protectedinherited

Returns: the number of physical bands in the cube.

Definition at line 496 of file CubeIoHandler.cpp.

void Isis::CubeIoHandler::clearCache ( bool blockForWriteCache = true ) const

inherited

Free all cube chunks (cached cube data) from memory and write them to disk.

Child destructors need to call this method.

This method should only be called otherwise when lots of cubes are in memory and the many caches cause problems with system RAM limitations.

Parameters

blockForWriteCache This should be true unless this method is called from the write thread.

Definition at line 399 of file CubeIoHandler.cpp.

Referenced by Isis::CubeBsqHandler::~CubeBsqHandler(), and ~CubeTileHandler().

QMutex * Isis::CubeIoHandler::dataFileMutex ( )

inherited

Get the mutex that this IO handler is using around I/Os on the given data file.

A lock should be acquired before doing any reads/writes on the data file externally.

Returns: A mutex that can guarantee exclusive access to the data file

Definition at line 489 of file CubeIoHandler.cpp.

int Isis::CubeTileHandler::findGoodSize	(	int	maxSize,
		int	dimensionSize
	)		const

private

This is a helper method that tries to compute a good tile size for one of the cube's dimensions (sample or line).

Band tile size is always 1 for this format currently.

Parameters

maxSize	The largest allowed size
dimensionSize	The cube's size in the dimension we're figuring out (that is, number of samples or number of lines).

Returns: The tile size that should be used for the dimension

Definition at line 151 of file CubeTileHandler.cpp.

Referenced by CubeTileHandler().

int Isis::CubeIoHandler::getBandCountInChunk ( ) const

protectedinherited

Returns: the number of bands per chunk for this cube.

Definition at line 504 of file CubeIoHandler.cpp.

BigInt Isis::CubeIoHandler::getBytesPerChunk ( ) const

protectedinherited

Returns: the byte size of each chunk in the cube. Currently they must be constant size, but this is planned to be changed at some point in time.; Number of bytes in a cube chunk

Definition at line 516 of file CubeIoHandler.cpp.

References Isis::SizeOf().

Referenced by Isis::CubeBsqHandler::getChunkStartByte(), and getTileStartByte().

int Isis::CubeIoHandler::getChunkCountInBandDimension ( ) const

protectedinherited

Returns: the total number of chunks in the band (Z) dimension. This is always enough to contain every band in the cube.

Definition at line 526 of file CubeIoHandler.cpp.

int Isis::CubeIoHandler::getChunkCountInLineDimension ( ) const

protectedinherited

Returns: the total number of chunks in the line (Y) dimension. This is always enough to contain every line in the cube.

Definition at line 535 of file CubeIoHandler.cpp.

int Isis::CubeIoHandler::getChunkCountInSampleDimension ( ) const

protectedinherited

Returns: the total number of chunks in the sample (X) dimension. This is always enough to contain every sample in the cube.

Definition at line 544 of file CubeIoHandler.cpp.

int Isis::CubeIoHandler::getChunkIndex ( const RawCubeChunk & chunk ) const

protectedinherited

Given a chunk, what's its index in the file.

Chunks are ordered from left to right, then top to bottom, then front to back (BSQ). The first chunk is at the top left of band 1 and is index 0, for example. In other words, this is going from the value of m_rawData to the key.

Chunks which sit outside of the cube entirely must not be passed into this method; the results will be wrong.

Returns: The chunk's index into the file

Definition at line 560 of file CubeIoHandler.cpp.

References Isis::RawCubeChunk::getStartBand(), Isis::RawCubeChunk::getStartLine(), and Isis::RawCubeChunk::getStartSample().

Referenced by Isis::CubeBsqHandler::getChunkStartByte(), and getTileStartByte().

QFile * Isis::CubeIoHandler::getDataFile ( )

protectedinherited

Returns: the QFile containing cube data. This is what should be read from and written to.; The data file for I/O

Definition at line 592 of file CubeIoHandler.cpp.

Referenced by readRaw(), Isis::CubeBsqHandler::readRaw(), writeRaw(), and Isis::CubeBsqHandler::writeRaw().

BigInt Isis::CubeIoHandler::getDataSize ( ) const

inherited

Returns: the number of bytes that the cube DNs will take up. This includes padding caused by the cube chunks not aligning with the cube dimensions.

Definition at line 441 of file CubeIoHandler.cpp.

BigInt Isis::CubeIoHandler::getDataStartByte ( ) const

protectedinherited

Returns: the byte offset to the beginning of the cube data.

Definition at line 581 of file CubeIoHandler.cpp.

Referenced by Isis::CubeBsqHandler::getChunkStartByte(), and getTileStartByte().

int Isis::CubeIoHandler::getLineCountInChunk ( ) const

protectedinherited

Returns: the number of lines in each chunk of the cube.

Definition at line 609 of file CubeIoHandler.cpp.

Referenced by updateLabels().

int Isis::CubeIoHandler::getSampleCountInChunk ( ) const

protectedinherited

Returns: the number of samples in each chunk of the cube.

Definition at line 634 of file CubeIoHandler.cpp.

Referenced by updateLabels().

BigInt Isis::CubeTileHandler::getTileStartByte ( const RawCubeChunk & chunk ) const

private

This is a helper method that goes from chunk to file position.

Parameters

chunk The chunk to locate in the file.

Returns: The position to start reading or writing at

Definition at line 179 of file CubeTileHandler.cpp.

References Isis::CubeIoHandler::getBytesPerChunk(), Isis::CubeIoHandler::getChunkIndex(), and Isis::CubeIoHandler::getDataStartByte().

Referenced by readRaw(), and writeRaw().

int Isis::CubeIoHandler::lineCount ( ) const

protectedinherited

Returns: the number of lines in the cube. This does not include lines created by the chunk overflowing the line dimension.

Definition at line 601 of file CubeIoHandler.cpp.

Referenced by Isis::CubeBsqHandler::CubeBsqHandler(), and CubeTileHandler().

CubeTileHandler& Isis::CubeTileHandler::operator= ( const CubeTileHandler & other )

private

Disallow assignments of this object.

Parameters

other The CubeTileHandler on the right-hand side of the assignment that we are copying into *this.

Returns: A reference to *this.

PixelType Isis::CubeIoHandler::pixelType ( ) const

protectedinherited

Returns: the physical cube DN format.

Definition at line 617 of file CubeIoHandler.cpp.

Referenced by Isis::CubeBsqHandler::CubeBsqHandler(), and CubeTileHandler().

void Isis::CubeIoHandler::read ( Buffer & bufferToFill ) const

inherited

Read cube data from disk into the buffer.

This is not const because it caches the read cube chunks from the disk.

Parameters

bufferToFill The buffer to populate with cube data.

Definition at line 246 of file CubeIoHandler.cpp.

References Isis::Buffer::Band(), Isis::Buffer::BandDimension(), Isis::Buffer::Line(), Isis::Buffer::LineDimension(), Isis::Null, Isis::Buffer::Sample(), Isis::Buffer::SampleDimension(), and Isis::Buffer::size().

void Isis::CubeTileHandler::readRaw ( RawCubeChunk & chunkToFill )

protectedvirtual

This needs to populate the chunkToFill with unswapped raw bytes from the disk.

See Also: CubeTileHandler::readRaw()

Parameters

chunkToFill The container that needs to be filled with cube data.

Implements Isis::CubeIoHandler.

Definition at line 93 of file CubeTileHandler.cpp.

References _FILEINFO_, Isis::RawCubeChunk::getByteCount(), Isis::CubeIoHandler::getDataFile(), getTileStartByte(), Isis::IException::Io, and Isis::RawCubeChunk::setRawData().

int Isis::CubeIoHandler::sampleCount ( ) const

protectedinherited

Returns: the number of samples in the cube. This does not include samples created by the chunk overflowing the sample dimension.

Definition at line 626 of file CubeIoHandler.cpp.

Referenced by Isis::CubeBsqHandler::CubeBsqHandler(), and CubeTileHandler().

void Isis::CubeIoHandler::setChunkSizes	(	int	numSamples,
		int	numLines,
		int	numBands
	)

protectedinherited

This should be called once from the child constructor.

This determines the chunk sizes used for the cube and often should remain constant for a particular cube (BSQ, for example, doesn't need it to be constant but Tile does). These being large can cause excessive use of disk space that stores no cube data. These being large can also drastically increase the amount of RAM consumed.

Parameters

numSamples	The chunk size in the sample dimension
numLines	The chunk size in the line dimension
numBands	The chunk size in the band dimension

Definition at line 651 of file CubeIoHandler.cpp.

References _FILEINFO_.

Referenced by Isis::CubeBsqHandler::CubeBsqHandler(), and CubeTileHandler().

void Isis::CubeIoHandler::setVirtualBands ( const QList< int > * virtualBandList )

inherited

This changes the virtual band list.

Parameters

virtualBandList A list where the indices are the vbands and the values are the physical bands. The values are 1-based. This can be specified as NULL, in which case the vbands are the physical bands. The virtual band list is copied (the pointer provided isn't remembered).

Definition at line 458 of file CubeIoHandler.cpp.

void Isis::CubeTileHandler::updateLabels ( Pvl & labels )

virtual

Update the cube labels so that this cube indicates what tile size it used.

Parameters

labels The "Core" object in this Pvl will be updated

Reimplemented from Isis::CubeIoHandler.

Definition at line 82 of file CubeTileHandler.cpp.

References Isis::PvlContainer::addKeyword(), Isis::PvlObject::findObject(), Isis::CubeIoHandler::getLineCountInChunk(), Isis::CubeIoHandler::getSampleCountInChunk(), and Isis::toString().

void Isis::CubeIoHandler::write ( const Buffer & bufferToWrite )

inherited

Write buffer data into the cube data on disk.

This could do no IO if the cube chunks required are already in memory and our caching algorithms say to not free any of the cube chunks afterwards.

Parameters

bufferToWrite The buffer to get cube data from.

Definition at line 354 of file CubeIoHandler.cpp.

void Isis::CubeTileHandler::writeRaw ( const RawCubeChunk & chunkToWrite )

protectedvirtual

This needs to write the chunkToWrite directly to disk with no modifications to the data itself.

See Also: CubeTileHandler::writeRaw()

Parameters

chunkToWrite The container that needs to be put on disk.

Implements Isis::CubeIoHandler.

Definition at line 118 of file CubeTileHandler.cpp.

References _FILEINFO_, Isis::RawCubeChunk::getByteCount(), Isis::CubeIoHandler::getDataFile(), Isis::RawCubeChunk::getRawData(), getTileStartByte(), and Isis::IException::Io.

The documentation for this class was generated from the following files:

src/base/objs/Cube/CubeTileHandler.h
src/base/objs/Cube/CubeTileHandler.cpp

Public Member Functions

Protected Member Functions

Private Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation