C# Class GSF.IO.FileStructure.IndexParser

This class provides passthrough properties for the IndexMapper class as well follows the directions of the Index Mapper to find the data cluster that contains the point in question.

Inheritance: IndexMapper

Afficher le fichier Open project: GridProtectionAlliance/openHistorian Class Usage Examples

Protected Properties

Свойство	Type	Description
DataClusterAddress	uint
FirstIndirectBlockAddress	uint
FourthIndirectBlockAddress	uint
SecondIndirectBlockAddress	uint
ThirdIndirectBlockAddress	uint

Méthodes publiques

Méthode	Description
ClearIndexCache ( IndexParser mostRecentParser ) : void	Resets the index cache with the information from the supplied mostRecentParser
IndexParser ( SubFileDiskIoSessionPool ioSessions ) : GSF.IO.FileStructure.Media	Creates a new instance of this class.
SetPositionAndLookup ( uint positionIndex ) : void	Determines if the current sector contains the position passed. If not, it updates the current sector to the one that contains the passed position.
VirtualToPhysical ( uint positionIndex ) : uint	This function will also call IndexMapper.MapPosition so after it returns, the current block data will be updated.

Private Methods

Méthode	Description
GetBlockIndexValue ( uint blockIndex, int offset, BlockType blockType, uint blockBaseIndex ) : uint	This uses the (blockIndex,offset) values to determine what the next block index is. This also has consistency checks to determine if the file is inconsistent (potentially corruption)
UpdateBlockInformation ( ) : void	Looks up the physical/virtual block positions for the address given.

Method Details

ClearIndexCache() public méthode

Resets the index cache with the information from the supplied mostRecentParser

public ClearIndexCache ( IndexParser mostRecentParser ) : void
mostRecentParser	IndexParser
Résultat	void

IndexParser() public méthode

Creates a new instance of this class.

public IndexParser ( SubFileDiskIoSessionPool ioSessions ) : GSF.IO.FileStructure.Media
ioSessions	SubFileDiskIoSessionPool	IoSessions to use to read from this disk
Résultat	GSF.IO.FileStructure.Media

SetPositionAndLookup() public méthode

Determines if the current sector contains the position passed. If not, it updates the current sector to the one that contains the passed position.

public SetPositionAndLookup ( uint positionIndex ) : void
positionIndex	uint	The position to navigate to indexed to the block data block size.
Résultat	void

VirtualToPhysical() public méthode

This function will also call IndexMapper.MapPosition so after it returns, the current block data will be updated.

public VirtualToPhysical ( uint positionIndex ) : uint
positionIndex	uint	The virtual index address.
Résultat	uint

Property Details

DataClusterAddress protected_oe property

The address of the first block of the data cluster.

protected uint DataClusterAddress
Résultat	uint

FirstIndirectBlockAddress protected_oe property

The address of the first indirect block

protected uint FirstIndirectBlockAddress
Résultat	uint

FourthIndirectBlockAddress protected_oe property

The address of the third indirect block

protected uint FourthIndirectBlockAddress
Résultat	uint

SecondIndirectBlockAddress protected_oe property

The address of the second indirect block

protected uint SecondIndirectBlockAddress
Résultat	uint

ThirdIndirectBlockAddress protected_oe property

The address of the third indirect block

protected uint ThirdIndirectBlockAddress
Résultat	uint