casacore::BaseTableIterator Class Reference

Base class for table iterator. More...

#include <BaseTabIter.h>

Public Member Functions
	BaseTableIterator (BaseTable *, const Block< String > &columnNames, const Block< CountedPtr< BaseCompare > > &cmpObjs, const Block< Int > &orders, int option, bool cacheIterationBoundaries=false)
	Create the table iterator to iterate through the given columns in the given order. More...
BaseTableIterator *	clone () const
	Clone this iterator. More...
virtual	~BaseTableIterator ()
virtual void	reset ()
	Reset the iterator (i.e. More...
virtual BaseTable *	next ()
	Return the next group. More...
virtual void	copyState (const BaseTableIterator &)
const String &	keyChangeAtLastNext () const
	Report Name of slowest sort column that changed (according to the comparison function) to terminate the most recent call to next() Enables clients to sense iteration boundary properties and organize associated iterations. More...

Protected Member Functions
	BaseTableIterator (const BaseTableIterator &)
	Copy constructor (to be used by clone) More...
BaseTable *	noCachedIterBoundariesNext ()

Protected Attributes
BaseTable *	sortTab_p
rownr_t	lastRow_p
uInt	nrkeys_p
String	keyChangeAtLastNext_p
PtrBlock< BaseColumn * >	colPtr_p
Block< CountedPtr< BaseCompare > >	cmpObj_p

Private Member Functions
BaseTableIterator &	operator= (const BaseTableIterator &)
	Assignment is not needed, because the assignment operator in the envelope class TableIterator has reference semantics. More...

Private Attributes
Block< void * >	lastVal_p
Block< void * >	curVal_p
std::shared_ptr< Vector < rownr_t > >	sortIterBoundaries_p
std::shared_ptr< Vector< size_t > >	sortIterKeyIdxChange_p
Vector< rownr_t >::iterator	sortIterBoundariesIt_p
Vector< size_t >::iterator	sortIterKeyIdxChangeIt_p
RefTable *	aRefTable_p

Detailed Description

Base class for table iterator.

Intended use:

Internal

Review Status

Reviewed By:

UNKNOWN

Date Reviewed:

before2004/08/25

Prerequisite

• BaseTable
• TableIterator

Etymology

BaseTableIterator is the base class for the classes doing the actual iterating through a table.

Synopsis

BaseTableIterator is the base class for the table iterators. It is a letter class of the envelope TableIterator. Currently there are no classes derived from BaseTableIterator, since it can do all the work itself. However, in the future this need not to be true anymore.

BaseTableIterator iterates by sorting the table in the required order and then creating a RefTable for each step containing the rows for that iteration step. Each iteration step assembles the rows with equal key values.

Definition at line 83 of file BaseTabIter.h.

Constructor & Destructor Documentation

casacore::BaseTableIterator::BaseTableIterator	(	BaseTable *	,
		const Block< String > &	columnNames,
		const Block< CountedPtr< BaseCompare > > &	cmpObjs,
		const Block< Int > &	orders,
		int	option,
		bool	cacheIterationBoundaries = false
	)

Create the table iterator to iterate through the given columns in the given order.

The given compare objects will be used for the sort and to compare if values are equal. If a compare object in cmpObjs is null, the default ObjCompare<T> will be used. If cacheIterationBoundaries is set to true then the iteration boundaries computed at construction time while sorting the table are used when advancing with next(). Otherwise, for each next() call the comparison functions are reevaluated again to get the iteration boundary. This improves performance in general but will break existing applications that change the comparison objects (cmpObjs) between iterations.

virtual casacore::BaseTableIterator::~BaseTableIterator ( )

virtual

casacore::BaseTableIterator::BaseTableIterator ( const BaseTableIterator &  )

protected

Copy constructor (to be used by clone)

Member Function Documentation

BaseTableIterator* casacore::BaseTableIterator::clone

(

)

const

Clone this iterator.

virtual void casacore::BaseTableIterator::copyState ( const BaseTableIterator &  )

virtual

const String& casacore::BaseTableIterator::keyChangeAtLastNext ( ) const

inline

Report Name of slowest sort column that changed (according to the comparison function) to terminate the most recent call to next() Enables clients to sense iteration boundary properties and organize associated iterations.

Definition at line 122 of file BaseTabIter.h.

virtual BaseTable* casacore::BaseTableIterator::next ( )

virtual

Return the next group.

BaseTable* casacore::BaseTableIterator::noCachedIterBoundariesNext ( )

protected

BaseTableIterator& casacore::BaseTableIterator::operator= ( const BaseTableIterator &  )

private

Assignment is not needed, because the assignment operator in the envelope class TableIterator has reference semantics.

Declaring it private, makes it unusable.

virtual void casacore::BaseTableIterator::reset ( )

virtual

Reset the iterator (i.e.

restart iteration).

Member Data Documentation

RefTable* casacore::BaseTableIterator::aRefTable_p

private

Definition at line 150 of file BaseTabIter.h.

Block<CountedPtr<BaseCompare> > casacore::BaseTableIterator::cmpObj_p

protected

Definition at line 130 of file BaseTabIter.h.

PtrBlock<BaseColumn*> casacore::BaseTableIterator::colPtr_p

protected

Definition at line 129 of file BaseTabIter.h.

Block<void*> casacore::BaseTableIterator::curVal_p

private

Definition at line 144 of file BaseTabIter.h.

String casacore::BaseTableIterator::keyChangeAtLastNext_p

protected

Definition at line 128 of file BaseTabIter.h.

rownr_t casacore::BaseTableIterator::lastRow_p

protected

Definition at line 126 of file BaseTabIter.h.

Block<void*> casacore::BaseTableIterator::lastVal_p

private

Definition at line 143 of file BaseTabIter.h.

uInt casacore::BaseTableIterator::nrkeys_p

protected

Definition at line 127 of file BaseTabIter.h.

std::shared_ptr<Vector<rownr_t> > casacore::BaseTableIterator::sortIterBoundaries_p

private

Definition at line 146 of file BaseTabIter.h.

Vector<rownr_t>::iterator casacore::BaseTableIterator::sortIterBoundariesIt_p

private

Definition at line 148 of file BaseTabIter.h.

std::shared_ptr<Vector<size_t> > casacore::BaseTableIterator::sortIterKeyIdxChange_p

private

Definition at line 147 of file BaseTabIter.h.

Vector<size_t>::iterator casacore::BaseTableIterator::sortIterKeyIdxChangeIt_p

private

Definition at line 149 of file BaseTabIter.h.

BaseTable* casacore::BaseTableIterator::sortTab_p

protected

Definition at line 122 of file BaseTabIter.h.

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

• tables/Tables/BaseTabIter.h