PostGIS  2.5.0beta1dev-r@@SVN_REVISION@@

◆ ST_Equals()

Datum ST_Equals ( PG_FUNCTION_ARGS  )

Definition at line 2504 of file postgis/lwgeom_geos.c.

References error_if_srid_mismatch(), errorIfGeometryCollection(), gbox_same_2d_float(), gserialized_get_gbox_p(), gserialized_get_srid(), gserialized_is_empty(), HANDLE_GEOS_ERROR, issimple(), LW_FALSE, lwgeom_geos_error(), PG_FUNCTION_INFO_V1(), and POSTGIS2GEOS().

Referenced by relate_full().

2505 {
2506  GSERIALIZED *geom1;
2507  GSERIALIZED *geom2;
2508  GEOSGeometry *g1, *g2;
2509  char result;
2510  GBOX box1, box2;
2511 
2512  geom1 = PG_GETARG_GSERIALIZED_P(0);
2513  geom2 = PG_GETARG_GSERIALIZED_P(1);
2514 
2515  errorIfGeometryCollection(geom1,geom2);
2517 
2518  /* Empty == Empty */
2519  if ( gserialized_is_empty(geom1) && gserialized_is_empty(geom2) )
2520  PG_RETURN_BOOL(true);
2521 
2522  /*
2523  * short-circuit: If geom1 and geom2 do not have the same bounding box
2524  * we can return FALSE.
2525  */
2526  if ( gserialized_get_gbox_p(geom1, &box1) &&
2527  gserialized_get_gbox_p(geom2, &box2) )
2528  {
2529  if ( gbox_same_2d_float(&box1, &box2) == LW_FALSE )
2530  {
2531  PG_RETURN_BOOL(false);
2532  }
2533  }
2534 
2535  /*
2536  * short-circuit: if geom1 and geom2 are binary-equivalent, we can return
2537  * TRUE. This is much faster than doing the comparison using GEOS.
2538  */
2539  if (VARSIZE(geom1) == VARSIZE(geom2) && !memcmp(geom1, geom2, VARSIZE(geom1))) {
2540  PG_RETURN_BOOL(true);
2541  }
2542 
2543  initGEOS(lwpgnotice, lwgeom_geos_error);
2544 
2545  g1 = POSTGIS2GEOS(geom1);
2546 
2547  if (!g1)
2548  HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
2549 
2550  g2 = POSTGIS2GEOS(geom2);
2551 
2552  if (!g2)
2553  {
2554  GEOSGeom_destroy(g1);
2555  HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
2556  }
2557 
2558  result = GEOSEquals(g1,g2);
2559 
2560  GEOSGeom_destroy(g1);
2561  GEOSGeom_destroy(g2);
2562 
2563  if (result == 2) HANDLE_GEOS_ERROR("GEOSEquals");
2564 
2565  PG_FREE_IF_COPY(geom1, 0);
2566  PG_FREE_IF_COPY(geom2, 1);
2567 
2568  PG_RETURN_BOOL(result);
2569 }
int gserialized_get_gbox_p(const GSERIALIZED *g, GBOX *box)
Read the bounding box off a serialization and calculate one if it is not already there.
Definition: g_serialized.c:639
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:338
int gserialized_is_empty(const GSERIALIZED *g)
Check if a GSERIALIZED is empty without deserializing first.
Definition: g_serialized.c:178
void lwgeom_geos_error(const char *fmt,...)
#define LW_FALSE
Definition: liblwgeom.h:76
GEOSGeometry * POSTGIS2GEOS(GSERIALIZED *pglwgeom)
#define HANDLE_GEOS_ERROR(label)
int gbox_same_2d_float(const GBOX *g1, const GBOX *g2)
Check if two given GBOX are the same in x and y, or would round to the same GBOX in x and if serializ...
Definition: g_box.c:194
int32_t gserialized_get_srid(const GSERIALIZED *s)
Extract the SRID from the serialized form (it is packed into three bytes so this is a handy function)...
Definition: g_serialized.c:99
void errorIfGeometryCollection(GSERIALIZED *g1, GSERIALIZED *g2)
Throws an ereport ERROR if either geometry is a COLLECTIONTYPE.
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