WhirlyGlobe::VectorDatabase Class Reference

#include <VectorDatabase.h>

List of all members.

Public Member Functions
	VectorDatabase (NSString *bundleDir, NSString *cacheDir, NSString *baseName, VectorReader *reader, const std::set< std::string > *indices, bool cache=false, bool autoload=false)
void	setAutoload (bool autoload)
void	setMemCache (bool memCache)
	Turn memory caching on or off.
void	process ()
	If you want the vector db to autoload, call this periodically.
unsigned int	numVectors ()
	Total number of vectors in the database.
GeoMbr	getMbr (unsigned int)
VectorShapeRef	getVector (unsigned int, bool withAttributes=true)
void	getVectorsWithinMbr (const GeoMbr &mbr, UIntSet &vecIds)
	Return a list of all the features that overlap.
void	getMatchingVectors (NSString *query, UIntSet &vecIds)
void	getMatchingVectors (NSString *query, ShapeSet &shapes)
	This version returns a set of shapes.
void	findArealsForPoint (const GeoCoord &coord, ShapeSet &shapes)
Protected Member Functions
bool	buildCaches (NSString *mbrCache, NSString *sqlDb)
bool	readCaches (NSString *mbrCache, NSString *sqlDb)
Protected Attributes
VectorReader *	reader
std::vector< GeoMbr >	mbrs
bool	vecCacheOn
	If we're caching in memory, this is the cache.
std::map< unsigned int, VectorShapeRef >	vecCache
bool	autoloadOn
	If we're slowly loading data in, this is how we keep track.
int	autoloadWhere
sqlite3 *	db
	Open SQLite database.

---

Detailed Description

The Vector Database is used to keep vector data out of memory until needed. It will initialize itself if its cache files aren't there. That can be slow, so ideally initialize it offline. It builds both a file of MBRs and a sqlite database with the attributes

---

Constructor & Destructor Documentation

WhirlyGlobe::VectorDatabase::VectorDatabase	(	NSString *	bundleDir,
		NSString *	cacheDir,
		NSString *	baseName,
		VectorReader *	reader,
		const std::set< std::string > *	indices,
		bool	cache = false,
		bool	autoload = false
	)

Either initialize from or build the cache info for a vector db. cacheDir is where the cache files are or you want them to be. baseName should correspond to the file being read. reader is a vector reader that can seek. Will delete this on destruction. indices are sqlite columns to make indices if we're constructing this thing

---

Member Function Documentation

void WhirlyGlobe::VectorDatabase::findArealsForPoint	(	const GeoCoord &	coord,
		ShapeSet &	shapes
	)

Return any areals that surround the given point. The caller is responsible for deletion

void WhirlyGlobe::VectorDatabase::getMatchingVectors	(	NSString *	query,
		UIntSet &	vecIds
	)

Run a SQL query, returning the list of IDs that match. Pass in the where clause, essentially. This version returns a set of IDs

GeoMbr WhirlyGlobe::VectorDatabase::getMbr

(

unsigned

int

)

Fetch an MBR for the given vector. This is cheap because it's in memory

VectorShapeRef WhirlyGlobe::VectorDatabase::getVector	(	unsigned	int,
		bool	withAttributes = true
	)

Fetch the corresponding vector. This probably isn't cheap since we're going out to "disk". We can also read the attributes, or not This is returning a reference counted shape so keep it around until you're done with it.

void WhirlyGlobe::VectorDatabase::setAutoload

(

bool

autoload

)

Turn automatic loading on or off If it's on, you need to call process

---

Member Data Documentation

std::vector<GeoMbr> WhirlyGlobe::VectorDatabase::mbrs [protected]

Flat list of the vectors and their MBRs. Need a spatial index here, ideally an R-Tree

---

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

• /Users/sjg/iPhone/WhirlyGlobe/WhirlyGlobeSrc/WhirlyGlobeLib/include/VectorDatabase.h