IlvDefaultSDOTileLoader Class Reference

This tile loader loads a complete SDO layer with tiles that are equivalent to the SDO tiles. More...

#include <ilviews/maps/format/oracle/sdotileload.h>

Inheritance diagram for IlvDefaultSDOTileLoader:

Public Member Functions
	IlvDefaultSDOTileLoader (const IlvMapAdapter *mapadapter, IldDbms *dbms, const char *layerName)
	Initializes a new instance of IlvDefaultSDOTileLoader, which loads tiles from the specified layer of an SDO database. More...
virtual IlvMapsError	dbmsRestored ()
	Called by the IlvSDOLayer read from an .ilv file, after the connection to an Oracle SDO database has been restored. More...
const char *	getLayerName ()
	Returns the name of the SDO layer of this tile loader.
virtual IldRequest *	getRequest (IlvTile *tile)
	Returns an IldRequest containing all the geometries that intersect the tile. More...
const char *	getSDOCode (IlvTile *tile)
	Returns the SDO code associated with the tile. More...
virtual IlvRect *	getSize ()
	Returns the bounding box of the data set managed by the tile loader. More...
IlUShort	getTileGroupingCount () const
	Returns the number of tiles to be loaded in one unique request. More...
const IlvRect &	getTileOrigin () const
	Returns the bounding box of the upper-left SDO tile.
virtual IlvMapsError	load (IlvTile *tile)
	Loads a tile from the Oracle database and adds the graphic objects to the layer of the tile. More...
void	setTileGroupingCount (IlUShort nb)
	Sets the number of tiles to be loaded in one unique request. More...
Public Member Functions inherited from IlvSDOTileLoader
IldDbms *	getDbms () const
	Returns the IldDbms representing the connection to the Oracle database. More...
IlvMapsError	getInitStatus () const
	Returns the error code that may have happened during the loader construction. More...
virtual IlBoolean	isPersistent () const
	Indicates whether this IlvSDOTileLoader is persistent. More...
virtual void	release (IlvTile *tile)
	Releases the content of a tile when required by the cache of the layer. More...
Public Member Functions inherited from IlvTileLoader
virtual void	controllerDeleted (IlvTileController *controller)
	Called when the controller is deleted. More...
virtual void	tileDeleted (IlvTile *tile)
	Called when a tile is deleted during the controller destruction. More...

Protected Member Functions
IlvSDOFeatureIterator *	getFeatureIterator (IldRequest *request, IlvMapsError &status)
	Returns the instance of IlvSDOFeatureIterator that is used by the tile loader. More...
Protected Member Functions inherited from IlvSDOTileLoader
	IlvSDOTileLoader (IldDbms *dbms)
	Initializes a new instance of IlvSDOTileLoader. More...
IldRequest *	executeQuery (const char *query)
	Executes the specified query and exports a trace if the SQL traces are enabled. More...

Detailed Description

This tile loader loads a complete SDO layer with tiles that are equivalent to the SDO tiles.

Library: ilvdbmaps

This tile loader is optimized for speed performance thanks to the tile grouping capacity that can be used through the setTileGroupingCount() method.

See also

IlvSDOLayer.

Constructor & Destructor Documentation

IlvDefaultSDOTileLoader()

IlvDefaultSDOTileLoader::IlvDefaultSDOTileLoader	(	const IlvMapAdapter *	mapadapter,
		IldDbms *	dbms,
		const char *	layerName
	)

Initializes a new instance of IlvDefaultSDOTileLoader, which loads tiles from the specified layer of an SDO database.

Parameters

mapadapter	The map adapter of the tile loader.
dbms	The database connection.
layerName	The name of the layer.

Member Function Documentation

dbmsRestored()

virtual IlvMapsError IlvDefaultSDOTileLoader::dbmsRestored ( )

virtual

Called by the IlvSDOLayer read from an .ilv file, after the connection to an Oracle SDO database has been restored.

Returns

An IlvMapsError code.

Reimplemented from IlvSDOTileLoader.

getFeatureIterator()

IlvSDOFeatureIterator* IlvDefaultSDOTileLoader::getFeatureIterator ( IldRequest *  request, IlvMapsError &  status  )

protected

Returns the instance of IlvSDOFeatureIterator that is used by the tile loader.

You can override this method in order to use your own feature iterator.

Parameters

request	The request from which geometries are read.
status	The error that may have been produced by the method.

Returns

The IlvSDOFeatureIterator used by the tile loader.

getRequest()

virtual IldRequest* IlvDefaultSDOTileLoader::getRequest ( IlvTile *  tile )

virtual

Returns an IldRequest containing all the geometries that intersect the tile.

This method is called by the load(IlvTile) method to define the list of geometries that have to be loaded in a tile. The implementation of this class returns all the geometries that have the same SDO_CODE as the specified tile.

Parameters

tile

The tile.

See also

getSDOCode().

Reimplemented from IlvSDOTileLoader.

getSDOCode()

const char* IlvDefaultSDOTileLoader::getSDOCode

(

IlvTile *

tile

)

Returns the SDO code associated with the tile.

Parameters

tile	The tile for the load-on-demand mechanism.

Returns

The SDO code associated with the tile.

getSize()

virtual IlvRect* IlvDefaultSDOTileLoader::getSize ( )

virtual

Returns the bounding box of the data set managed by the tile loader.

If the bounding box cannot be computed, this method can return 0. The IlvSDOLayer using this object will have an undefined size.

The default implementation returns 0.

Returns

The bounding box of the data set managed by the tile loader.

Reimplemented from IlvSDOTileLoader.

getTileGroupingCount()

IlUShort IlvDefaultSDOTileLoader::getTileGroupingCount

(

)

const

Returns the number of tiles to be loaded in one unique request.

See also

setTileGroupingCount().

load()

virtual IlvMapsError IlvDefaultSDOTileLoader::load ( IlvTile *  tile )

virtual

Loads a tile from the Oracle database and adds the graphic objects to the layer of the tile.

This method calls getRequest() to get the SDO geometries, transforms them into graphic objects using the renderer of the layer, and then adds the objects to the layer.

Parameters

tile	The tile to be loaded.

See also

getRequest().

Reimplemented from IlvSDOTileLoader.

setTileGroupingCount()

void IlvDefaultSDOTileLoader::setTileGroupingCount

(

IlUShort

nb

)

Sets the number of tiles to be loaded in one unique request.

This is particularly useful for the load on demand where you can group a given number of tiles to be loaded together (when for instance the zoom factor is important so that you are visualizing a certain number of tiles at the same time).