#include "BlockArray.h"

Collaboration diagram for BlockArray:

Public Member Functions
	BlockArray ()
	Creates a history file for holding maximal size blocks.
	~BlockArray ()
	destructor
size_t	append (Block *block)
	adds the Block at the end of history.
const Block *	at (size_t index)
	gets the block at the index.
size_t	getCurrent () const
bool	has (size_t index) const
Block *	lastBlock () const
size_t	len () const
size_t	newBlock ()
bool	setHistorySize (size_t newsize)
	reorders blocks as needed.
bool	setSize (size_t newsize)
	Convenient function to set the size in KBytes instead of blocks.

Private Member Functions
void	decreaseBuffer (size_t newsize)
void	increaseBuffer ()
void	unmap ()

Private Attributes
size_t	current
size_t	index
int	ion
Block *	lastblock
Block *	lastmap
size_t	lastmap_index
size_t	length
size_t	size

Detailed Description

Definition at line 39 of file BlockArray.h.

Constructor & Destructor Documentation

BlockArray::BlockArray ( )

Creates a history file for holding maximal size blocks.

If more blocks are requested, then it drops earlier added ones.

Definition at line 39 of file BlockArray.cpp.

BlockArray::~BlockArray ( )

destructor

Definition at line 54 of file BlockArray.cpp.

References lastblock, and setHistorySize().

Member Function Documentation

size_t BlockArray::append ( Block * block )

adds the Block at the end of history.

This may drop other blocks.

The ownership on the block is transfered. An unique index number is returned for accessing it later (if not yet dropped then)

Note, that the block may be dropped completely if history is turned off.

Definition at line 60 of file BlockArray.cpp.

References current, index, ion, length, SEEK_SET, setHistorySize(), and size.

Referenced by newBlock().

const Block * BlockArray::at ( size_t index )

gets the block at the index.

Function may return 0 if the block isn't available any more.

The returned block is strictly readonly as only maped in memory - and will be invalid on the next operation on this class.

Definition at line 108 of file BlockArray.cpp.

References index, ion, lastblock, lastmap, lastmap_index, size, and unmap().

Referenced by HistoryScrollBlockArray::getCells().

void BlockArray::decreaseBuffer ( size_t newsize )

private

Definition at line 227 of file BlockArray.cpp.

References blocksize, current, index, ion, length, moveBlock(), and size.

Referenced by setHistorySize().

size_t BlockArray::getCurrent ( ) const

inline

Definition at line 97 of file BlockArray.h.

References current.

Referenced by HistoryScrollBlockArray::addCells().

bool BlockArray::has ( size_t index ) const

Definition at line 96 of file BlockArray.cpp.

References index, and length.

void BlockArray::increaseBuffer ( )

private

Definition at line 273 of file BlockArray.cpp.

References blocksize, current, index, ion, length, moveBlock(), SEEK_SET, and size.

Referenced by setHistorySize().

Block * BlockArray::lastBlock ( ) const

Definition at line 91 of file BlockArray.cpp.

References lastblock.

Referenced by HistoryScrollBlockArray::addCells().

size_t BlockArray::len ( ) const

inline

Definition at line 93 of file BlockArray.h.

References length.

Referenced by lennob(), xermsg(), and xerprn().

size_t BlockArray::newBlock ( )

Definition at line 81 of file BlockArray.cpp.

References append(), index, lastblock, and size.

Referenced by HistoryScrollBlockArray::addCells().

bool BlockArray::setHistorySize ( size_t newsize )

reorders blocks as needed.

If newsize is null, the history is emptied completely. The indices returned on append won't change their semantic, but they may not be valid after this call.

Definition at line 156 of file BlockArray.cpp.

References current, decreaseBuffer(), increaseBuffer(), ion, lastblock, length, size, and unmap().

Referenced by append(), HistoryScrollBlockArray::HistoryScrollBlockArray(), setSize(), and ~BlockArray().

bool BlockArray::setSize ( size_t newsize )

Convenient function to set the size in KBytes instead of blocks.

Definition at line 151 of file BlockArray.cpp.

References setHistorySize().

void BlockArray::unmap ( )

private

Definition at line 141 of file BlockArray.cpp.

References lastmap, and lastmap_index.

Referenced by at(), and setHistorySize().