ways_meos.c File Reference

Implementation of a cache storing the route records read from a ways CSV file. More...

#include <assert.h>
#include <float.h>
#include <postgres.h>
#include <liblwgeom.h>
#include <meos.h>
#include "geo/tgeo_spatialfuncs.h"
#include "npoint/tnpoint.h"

Data Structures
struct	struct_WaysCache
	The ways cache holds a fixed number of ways records read from the ways table or CSV file. More...
struct	struct_WaysCacheEntry
	Structure to represent an entry in the ways cache. More...
struct	ways_record
	Structure to represent a record in the ways CSV file. More...

Macros
#define	MAX_LENGTH_GEOM   100001
#define	WAYS_CACHE_SIZE   128
#define	WAYS_CSV   "/usr/local/share/ways1000.csv"

Typedefs
typedef struct struct_WaysCache	WaysCache
	The ways cache holds a fixed number of ways records read from the ways CSV file. More...
typedef struct struct_WaysCacheEntry	WaysCacheEntry
	Structure to represent an entry in the ways cache. More...

Functions
static WaysCacheEntry *	AddRouteToWaysCache (WaysCache *ways_cache, ways_record *rec)
	Add a route to the ways cache. More...
static void	DeleteRouteFromWaysCache (WaysCache *ways_cache, uint32_t position)
	Remove from the ways cache the route in a given position. More...
static void	DestroyWaysCache (WaysCache *ways_cache)
	Free all the malloc'ed geometries stored in the ways cache and free the cache. More...
Npoint *	geompoint_to_npoint (const GSERIALIZED *gs)
	Transform a geometry into a network point. More...
int32_t	get_srid_ways ()
	Return the SRID of the routes in the ways table. More...
static bool	get_ways_record (int64 rid, ways_record *rec)
	Access the ways CSV file to get the geometry of a route and compute its length. More...
static WaysCacheEntry *	GetRouteFromWaysCache (WaysCache *ways_cache, int64 gid, bool any_gid)
	Get a route from the ways cache, if not found return NULL More...
static WaysCache *	GetWaysCache ()
	Get the ways cache variable from the global variable if one exists. More...
void	meos_finalize_ways (void)
	Destroy the ways cache. More...
bool	route_exists (int64 rid)
	Return true if the edge table contains a route with the route identifier. More...
GSERIALIZED *	route_geom (int64 rid)
	Access the edge table to get the route geometry from corresponding route identifier. More...
double	route_length (int64 rid)
	Access the edge table to return the route length from the corresponding route identifier. More...
static bool	route_lookup (int64 gid, bool any_gid, ways_record *rec)
	Return true if a Ways entry was read from the ways cache, return false otherwise. More...

Variables
WaysCache *	MEOS_WAYS_CACHE = NULL

Detailed Description

Implementation of a cache storing the route records read from a ways CSV file.