An optionally strided region in a Lattice. More...

#include <LatticeRegion.h>

Inheritance diagram for casa::LatticeRegion:

Public Member Functions
	LatticeRegion ()
	The default constructor creates a LatticeRegion that is useless for just about everything, except that it can be assigned to with the assignment operator.
	LatticeRegion (const LCRegion &region)
	Create from the given region.
	LatticeRegion (LCRegion *region)
	Create from the given region and take over the pointer.
	LatticeRegion (const Slicer &slicer, const IPosition &latticeShape)
	Construct from the given slicer.
	LatticeRegion (const LatticeRegion &other)
	Copy constructor (reference semantics).
virtual	~LatticeRegion ()
LatticeRegion &	operator= (const LatticeRegion &other)
	Assignment (reference semantics).
virtual Lattice< Bool > *	clone () const
	Make a copy of the object (reference semantics).
virtual Bool	isWritable () const
	Is the LatticeRegion writable?
Bool	hasMask () const
	Has the region a mask?
virtual Bool	lock (FileLocker::LockType, uInt nattempts)
	Handle the (un)locking.
virtual void	unlock ()
virtual Bool	hasLock (FileLocker::LockType) const
virtual void	resync ()
	Resynchronize the PagedArray object with the lattice file.
virtual void	flush ()
	Flush the data (but do not unlock).
virtual void	tempClose ()
	Temporarily close the lattice.
virtual void	reopen ()
	Explicitly reopen the temporarily closed lattice.
const LCRegion &	region () const
	Get the LCRegion object describing the region.
const Slicer &	slicer () const
	Get the Slicer object describing the region.
virtual IPosition	shape () const
	Returns the shape of the LatticeRegion including all degenerate axes (i.e.
virtual uInt	ndim () const
	Returns the number of axes in this LatticeRegion.
virtual size_t	nelements () const
	Returns the total number of elements in this LatticeRegion.
virtual Bool	ok () const
	Check class internals - used for debugging.
virtual LatticeIterInterface < Bool > *	makeIter (const LatticeNavigator &navigator, Bool useRef) const
	This function is used by the LatticeIterator class to generate an iterator of the correct type for this Lattice.
virtual uInt	advisedMaxPixels () const
	Returns the maximum recommended number of pixels for a cursor.
virtual IPosition	doNiceCursorShape (uInt maxPixels) const
	Help the user pick a cursor for most efficient access.
virtual uInt	maximumCacheSize () const
	Maximum size - not necessarily all used.
virtual void	setMaximumCacheSize (uInt howManyPixels)
	Set the maximum (allowed) cache size as indicated.
virtual void	setCacheSizeFromPath (const IPosition &sliceShape, const IPosition &windowStart, const IPosition &windowLength, const IPosition &axisPath)
	Set the cache size as to "fit" the indicated path.
virtual void	setCacheSizeInTiles (uInt howManyTiles)
	Set the actual cache size for this Array to be be big enough for the indicated number of tiles.
virtual void	clearCache ()
	Clears and frees up the caches, but the maximum allowed cache size is unchanged from when setCacheSize was called.
virtual void	showCacheStatistics (ostream &os) const
	Report on cache success.
virtual void	set (const Bool &value)
	The following "put" functions are described in detail in class Lattice .
virtual void	apply (Bool(*function)(Bool))
	Replace every element, x, of the Lattice with the result of f(x).
virtual void	apply (Bool(*function)(const Bool &))
virtual void	apply (const Functional< Bool, Bool > &function)
virtual void	putAt (const Bool &value, const IPosition &where)
	Put the value of a single element.
virtual void	copyData (const Lattice< Bool > &from)
	Copy the data from the given lattice to this one.
Slicer	convert (const Slicer &slicer) const
	Convert positions to positions in the parent object.
IPosition	convert (const IPosition &position) const
virtual Bool	doGetSlice (Array< Bool > &buffer, const Slicer &section)
	Do the actual getting of the mask.
virtual void	doPutSlice (const Array< Bool > &sourceBuffer, const IPosition &where, const IPosition &stride)
	Do the actual putting of the mask.
Private Attributes
LCRegion *	itsRegion
Slicer	itsSlicer
Bool	itsHasRegionMask

Detailed Description

An optionally strided region in a Lattice.

Intended use:

Internal

Review Status

Date Reviewed:: yyyy/mm/dd

Prerequisite

LCRegion

Synopsis

A LatticeRegion is a lattice referencing a subset of another lattice by means of a Slicer object.
It is useful when only a subset of a lattice needs to be accessed.

When the LatticeRegion is created from a const Lattice object, it is not writable, thus it can only be used as an rvalue.

Example

Definition at line 73 of file LatticeRegion.h.

Constructor & Destructor Documentation

casa::LatticeRegion::LatticeRegion ( )

The default constructor creates a LatticeRegion that is useless for just about everything, except that it can be assigned to with the assignment operator.

casa::LatticeRegion::LatticeRegion ( const LCRegion & region )

Create from the given region.

The pointer to the parent can be 0.

casa::LatticeRegion::LatticeRegion ( LCRegion * region )

Create from the given region and take over the pointer.

This means the user should not delete the region object pointed to, because it will be deleted by the LatticeRegion destructor. The pointer to the parent is set to 0.

casa::LatticeRegion::LatticeRegion	(	const Slicer &	slicer,
		const IPosition &	latticeShape
	)

Construct from the given slicer.

The lattice shape has to be the lattice shape of the lattice where the region is taken from.

casa::LatticeRegion::LatticeRegion ( const LatticeRegion & other )

Copy constructor (reference semantics).

virtual casa::LatticeRegion::~LatticeRegion ( ) [virtual]

Member Function Documentation

virtual uInt casa::LatticeRegion::advisedMaxPixels ( ) const [virtual]

Returns the maximum recommended number of pixels for a cursor.

This is the number of pixels in a tile.

Reimplemented from casa::Lattice< Bool >.

virtual void casa::LatticeRegion::apply ( Bool(*)(Bool) function ) [virtual]

Replace every element, x, of the Lattice with the result of f(x).

You must pass in the address of the function -- so the function must be declared and defined in the scope of your program. All versions of apply require a function that accepts a single argument of type T (the Lattice template type) and return a result of the same type. The first apply expects a function with an argument passed by value; the second expects the argument to be passed by const reference; the third requires an instance of the class Functional<T,T>. The first form ought to run faster for the built-in types, which may be an issue for large Lattices stored in memory, where disk access is not an issue.

Reimplemented from casa::Lattice< Bool >.

virtual void casa::LatticeRegion::apply ( Bool(*)(const Bool &) function ) [virtual]

Reimplemented from casa::Lattice< Bool >.

virtual void casa::LatticeRegion::apply ( const Functional< Bool, Bool > & function ) [virtual]

Reimplemented from casa::Lattice< Bool >.

virtual void casa::LatticeRegion::clearCache ( ) [virtual]

Clears and frees up the caches, but the maximum allowed cache size is unchanged from when setCacheSize was called.

Reimplemented from casa::LatticeBase.

virtual Lattice<Bool>* casa::LatticeRegion::clone ( ) const [virtual]

Make a copy of the object (reference semantics).

Implements casa::Lattice< Bool >.

Slicer casa::LatticeRegion::convert ( const Slicer & slicer ) const

Convert positions to positions in the parent object.

IPosition casa::LatticeRegion::convert ( const IPosition & position ) const

virtual void casa::LatticeRegion::copyData ( const Lattice< Bool > & from ) [virtual]

Copy the data from the given lattice to this one.

The default implementation uses function copyDataTo.

Reimplemented from casa::Lattice< Bool >.

virtual Bool casa::LatticeRegion::doGetSlice	(	Array< Bool > &	buffer,
		const Slicer &	section
	)		`[virtual]`

Do the actual getting of the mask.

Implements casa::Lattice< Bool >.

virtual IPosition casa::LatticeRegion::doNiceCursorShape ( uInt maxPixels ) const [virtual]

Help the user pick a cursor for most efficient access.

Reimplemented from casa::LatticeBase.

virtual void casa::LatticeRegion::doPutSlice	(	const Array< Bool > &	sourceBuffer,
		const IPosition &	where,
		const IPosition &	stride
	)		`[virtual]`

Do the actual putting of the mask.

Only possible if region is writable.

Implements casa::Lattice< Bool >.

virtual void casa::LatticeRegion::flush ( ) [virtual]

Flush the data (but do not unlock).

Reimplemented from casa::LatticeBase.

virtual Bool casa::LatticeRegion::hasLock ( FileLocker::LockType ) const [virtual]

Reimplemented from casa::LatticeBase.

Bool casa::LatticeRegion::hasMask ( ) const [inline]

Has the region a mask?

Definition at line 235 of file LatticeRegion.h.

References itsHasRegionMask.

virtual Bool casa::LatticeRegion::isWritable ( ) const [virtual]

Is the LatticeRegion writable?

Reimplemented from casa::LatticeBase.

virtual Bool casa::LatticeRegion::lock	(	FileLocker::LockType	,
		uInt	nattempts
	)		`[virtual]`

Handle the (un)locking.

Reimplemented from casa::LatticeBase.

virtual LatticeIterInterface<Bool>* casa::LatticeRegion::makeIter	(	const LatticeNavigator &	navigator,
		Bool	useRef
	)		const `[virtual]`

This function is used by the LatticeIterator class to generate an iterator of the correct type for this Lattice.

Not recommended for general use.

Reimplemented from casa::Lattice< Bool >.

virtual uInt casa::LatticeRegion::maximumCacheSize ( ) const [virtual]

Maximum size - not necessarily all used.

In pixels.

Reimplemented from casa::LatticeBase.

virtual uInt casa::LatticeRegion::ndim ( ) const [virtual]

Returns the number of axes in this LatticeRegion.

This includes all degenerate axes.

Reimplemented from casa::LatticeBase.

virtual size_t casa::LatticeRegion::nelements ( ) const [virtual]

Returns the total number of elements in this LatticeRegion.

Reimplemented from casa::LatticeBase.

virtual Bool casa::LatticeRegion::ok ( ) const [virtual]

Check class internals - used for debugging.

Should always return True

Reimplemented from casa::LatticeBase.

LatticeRegion& casa::LatticeRegion::operator= ( const LatticeRegion & other )

Assignment (reference semantics).

virtual void casa::LatticeRegion::putAt	(	const Bool &	value,
		const IPosition &	where
	)		`[virtual]`

Put the value of a single element.

The default implementation uses putSlice.

Reimplemented from casa::Lattice< Bool >.

const LCRegion & casa::LatticeRegion::region ( ) const [inline]

Get the LCRegion object describing the region.

Note that it does not contain strides, even if this LatticeRegion object was constructed from a Slicer with strides. In that case the region only defines the resulting shape.

Definition at line 239 of file LatticeRegion.h.

References itsRegion.

virtual void casa::LatticeRegion::reopen ( ) [virtual]

Explicitly reopen the temporarily closed lattice.

Reimplemented from casa::LatticeBase.

virtual void casa::LatticeRegion::resync ( ) [virtual]

Resynchronize the PagedArray object with the lattice file.

This function is only useful if no read-locking is used, ie. if the table lock option is UserNoReadLocking or AutoNoReadLocking. In that cases the table system does not acquire a read-lock, thus does not synchronize itself automatically.

Reimplemented from casa::LatticeBase.

virtual void casa::LatticeRegion::set ( const Bool & value ) [virtual]

The following "put" functions are described in detail in class Lattice .

They'll throw an exception is no mask is available or if the mask is not writable.

Reimplemented from casa::Lattice< Bool >.

virtual void casa::LatticeRegion::setCacheSizeFromPath	(	const IPosition &	sliceShape,
		const IPosition &	windowStart,
		const IPosition &	windowLength,
		const IPosition &	axisPath
	)		`[virtual]`

Set the cache size as to "fit" the indicated path.

Reimplemented from casa::LatticeBase.

virtual void casa::LatticeRegion::setCacheSizeInTiles ( uInt howManyTiles ) [virtual]

Set the actual cache size for this Array to be be big enough for the indicated number of tiles.

This cache is not shared with PagedArrays in other rows and is always clipped to be less than the maximum value set using the setMaximumCacheSize member function. tiles. Tiles are cached using a first in first out algorithm.

Reimplemented from casa::LatticeBase.

virtual void casa::LatticeRegion::setMaximumCacheSize ( uInt howManyPixels ) [virtual]

Set the maximum (allowed) cache size as indicated.

Reimplemented from casa::LatticeBase.

virtual IPosition casa::LatticeRegion::shape ( ) const [virtual]

Returns the shape of the LatticeRegion including all degenerate axes (i.e.

axes with a length of one).

Implements casa::LatticeBase.

virtual void casa::LatticeRegion::showCacheStatistics ( ostream & os ) const [virtual]

Report on cache success.

Reimplemented from casa::LatticeBase.

const Slicer & casa::LatticeRegion::slicer ( ) const [inline]

Get the Slicer object describing the region.

Note that it may contain strides.

Definition at line 243 of file LatticeRegion.h.

References itsSlicer.

virtual void casa::LatticeRegion::tempClose ( ) [virtual]

Temporarily close the lattice.

It will be reopened automatically on the next access.

Reimplemented from casa::LatticeBase.

virtual void casa::LatticeRegion::unlock ( ) [virtual]

Reimplemented from casa::LatticeBase.

Member Data Documentation

Bool casa::LatticeRegion::itsHasRegionMask [private]

Definition at line 231 of file LatticeRegion.h.

Referenced by hasMask().

LCRegion* casa::LatticeRegion::itsRegion [private]

Definition at line 229 of file LatticeRegion.h.

Referenced by region().

Slicer casa::LatticeRegion::itsSlicer [private]

Definition at line 230 of file LatticeRegion.h.

Referenced by slicer().

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

casacore/lattices/Lattices/LatticeRegion.h

Public Member Functions

Private Attributes

Detailed Description

Intended use:

Review Status

Prerequisite

Synopsis

Example

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation