PostGIS  3.1.6dev-r@@SVN_REVISION@@

◆ LWGEOM_makeline_garray()

Datum LWGEOM_makeline_garray ( PG_FUNCTION_ARGS  )

Definition at line 1389 of file lwgeom_functions_basic.c.

1390 {
1391  ArrayType *array;
1392  int nelems;
1393  GSERIALIZED *result = NULL;
1394  LWGEOM **geoms;
1395  LWGEOM *outlwg;
1396  uint32 ngeoms;
1397  int32_t srid = SRID_UNKNOWN;
1398 
1399  ArrayIterator iterator;
1400  Datum value;
1401  bool isnull;
1402 
1403  POSTGIS_DEBUGF(2, "%s called", __func__);
1404 
1405  /* Return null on null input */
1406  if (PG_ARGISNULL(0))
1407  PG_RETURN_NULL();
1408 
1409  /* Get actual ArrayType */
1410  array = PG_GETARG_ARRAYTYPE_P(0);
1411 
1412  /* Get number of geometries in array */
1413  nelems = ArrayGetNItems(ARR_NDIM(array), ARR_DIMS(array));
1414 
1415  POSTGIS_DEBUGF(3, "%s: array has %d elements", __func__, nelems);
1416 
1417  /* Return null on 0-elements input array */
1418  if (nelems == 0)
1419  PG_RETURN_NULL();
1420 
1421  /*
1422  * Deserialize all point geometries in array into the
1423  * geoms pointers array.
1424  * Count actual number of points.
1425  */
1426 
1427  /* possibly more then required */
1428  geoms = palloc(sizeof(LWGEOM *) * nelems);
1429  ngeoms = 0;
1430 
1431  iterator = array_create_iterator(array, 0, NULL);
1432 
1433  while (array_iterate(iterator, &value, &isnull))
1434  {
1435  GSERIALIZED *geom;
1436 
1437  if (isnull)
1438  continue;
1439 
1440  geom = (GSERIALIZED *)DatumGetPointer(value);
1441 
1442  if (gserialized_get_type(geom) != POINTTYPE && gserialized_get_type(geom) != LINETYPE &&
1444  {
1445  continue;
1446  }
1447 
1448  geoms[ngeoms++] = lwgeom_from_gserialized(geom);
1449 
1450  /* Check SRID homogeneity */
1451  if (ngeoms == 1)
1452  {
1453  /* Get first geometry SRID */
1454  srid = geoms[ngeoms - 1]->srid;
1455  /* TODO: also get ZMflags */
1456  }
1457  else
1458  gserialized_error_if_srid_mismatch_reference(geom, srid, __func__);
1459 
1460  POSTGIS_DEBUGF(3, "%s: element %d deserialized", __func__, ngeoms);
1461  }
1462  array_free_iterator(iterator);
1463 
1464  /* Return null on 0-points input array */
1465  if (ngeoms == 0)
1466  {
1467  /* TODO: should we return LINESTRING EMPTY here ? */
1468  elog(NOTICE, "No points or linestrings in input array");
1469  PG_RETURN_NULL();
1470  }
1471 
1472  POSTGIS_DEBUGF(3, "LWGEOM_makeline_garray: elements: %d", ngeoms);
1473 
1474  outlwg = (LWGEOM *)lwline_from_lwgeom_array(srid, ngeoms, geoms);
1475 
1476  result = geometry_serialize(outlwg);
1477 
1478  PG_RETURN_POINTER(result);
1479 }
char result[OUT_DOUBLE_BUFFER_SIZE]
Definition: cu_print.c:267
void gserialized_error_if_srid_mismatch_reference(const GSERIALIZED *g1, const int32_t srid2, const char *funcname)
Definition: gserialized.c:419
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
Definition: gserialized.c:239
uint32_t gserialized_get_type(const GSERIALIZED *g)
Extract the geometry type from the serialized form (it hides in the anonymous data area,...
Definition: gserialized.c:89
#define LINETYPE
Definition: liblwgeom.h:117
#define MULTIPOINTTYPE
Definition: liblwgeom.h:119
#define POINTTYPE
LWTYPE numbers, used internally by PostGIS.
Definition: liblwgeom.h:116
#define SRID_UNKNOWN
Unknown SRID value.
Definition: liblwgeom.h:229
LWLINE * lwline_from_lwgeom_array(int32_t srid, uint32_t ngeoms, LWGEOM **geoms)
Definition: lwline.c:151
int value
Definition: genraster.py:62
int32_t srid
Definition: liblwgeom.h:474

References gserialized_error_if_srid_mismatch_reference(), gserialized_get_type(), LINETYPE, lwgeom_from_gserialized(), lwline_from_lwgeom_array(), MULTIPOINTTYPE, POINTTYPE, result, LWGEOM::srid, SRID_UNKNOWN, and genraster::value.

Referenced by pgis_geometry_makeline_finalfn().

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