PostGIS  2.3.8dev-r@@SVN_REVISION@@

◆ parse_gml_data()

static POINTARRAY* parse_gml_data ( xmlNodePtr  xnode,
bool *  hasz,
int *  root_srid 
)
static

Parse data coordinates.

There's several ways to encode data coordinates, who could be mixed inside a single geometrie:

  • gml:pos element
  • gml:posList element
  • gml:pointProperty
  • gml:pointRep (deprecated in 3.1.0)
  • gml:coordinate element with tuples string inside (deprecated in 3.1.0)
  • gml:coord elements with X,Y(,Z) nested elements (deprecated in 3.0.0)

Definition at line 836 of file lwgeom_in_gml.c.

References get_xlink_node(), gml_lwpgerror(), gml_reproject_pa(), is_gml_namespace(), is_xlink(), parse_gml_coord(), parse_gml_coordinates(), parse_gml_pos(), parse_gml_poslist(), parse_gml_srs(), ptarray_flip_coordinates(), ptarray_merge(), struct_gmlSrs::reverse_axis, struct_gmlSrs::srid, and SRID_UNKNOWN.

Referenced by parse_gml_curve(), parse_gml_line(), parse_gml_linearring(), parse_gml_patch(), parse_gml_point(), parse_gml_polygon(), and parse_gml_triangle().

837 {
838  POINTARRAY *pa = 0, *tmp_pa = 0;
839  xmlNodePtr xa, xb;
840  gmlSrs srs;
841  bool found;
842 
843  pa = NULL;
844 
845  for (xa = xnode ; xa != NULL ; xa = xa->next)
846  {
847  if (xa->type != XML_ELEMENT_NODE) continue;
848  if (!is_gml_namespace(xa, false)) continue;
849  if (xa->name == NULL) continue;
850 
851  if (!strcmp((char *) xa->name, "pos"))
852  {
853  tmp_pa = parse_gml_pos(xa, hasz);
854  if (pa == NULL) pa = tmp_pa;
855  else pa = ptarray_merge(pa, tmp_pa);
856 
857  }
858  else if (!strcmp((char *) xa->name, "posList"))
859  {
860  tmp_pa = parse_gml_poslist(xa, hasz);
861  if (pa == NULL) pa = tmp_pa;
862  else pa = ptarray_merge(pa, tmp_pa);
863 
864  }
865  else if (!strcmp((char *) xa->name, "coordinates"))
866  {
867  tmp_pa = parse_gml_coordinates(xa, hasz);
868  if (pa == NULL) pa = tmp_pa;
869  else pa = ptarray_merge(pa, tmp_pa);
870 
871  }
872  else if (!strcmp((char *) xa->name, "coord"))
873  {
874  tmp_pa = parse_gml_coord(xa, hasz);
875  if (pa == NULL) pa = tmp_pa;
876  else pa = ptarray_merge(pa, tmp_pa);
877 
878  }
879  else if (!strcmp((char *) xa->name, "pointRep") ||
880  !strcmp((char *) xa->name, "pointProperty"))
881  {
882 
883  found = false;
884  for (xb = xa->children ; xb != NULL ; xb = xb->next)
885  {
886  if (xb->type != XML_ELEMENT_NODE) continue;
887  if (!is_gml_namespace(xb, false)) continue;
888  if (!strcmp((char *) xb->name, "Point"))
889  {
890  found = true;
891  break;
892  }
893  }
894  if (!found || xb == NULL)
895  gml_lwpgerror("invalid GML representation", 29);
896 
897  if (is_xlink(xb)) xb = get_xlink_node(xb);
898  if (xb == NULL || xb->children == NULL)
899  gml_lwpgerror("invalid GML representation", 30);
900 
901  tmp_pa = parse_gml_data(xb->children, hasz, root_srid);
902  if (tmp_pa->npoints != 1)
903  gml_lwpgerror("invalid GML representation", 31);
904 
905  parse_gml_srs(xb, &srs);
906  if (srs.reverse_axis) tmp_pa = ptarray_flip_coordinates(tmp_pa);
907  if (*root_srid == SRID_UNKNOWN) *root_srid = srs.srid;
908  else if (srs.srid != *root_srid)
909  gml_reproject_pa(tmp_pa, srs.srid, *root_srid);
910  if (pa == NULL) pa = tmp_pa;
911  else pa = ptarray_merge(pa, tmp_pa);
912  }
913  }
914 
915  if (pa == NULL) gml_lwpgerror("invalid GML representation", 32);
916 
917  return pa;
918 }
static POINTARRAY * parse_gml_poslist(xmlNodePtr xnode, bool *hasz)
Parse gml:posList.
static void gml_lwpgerror(char *msg, int error_code)
Definition: lwgeom_in_gml.c:81
static void parse_gml_srs(xmlNodePtr xnode, gmlSrs *srs)
Parse gml srsName attribute.
static POINTARRAY * parse_gml_coordinates(xmlNodePtr xnode, bool *hasz)
Parse gml:coordinates.
static POINTARRAY * parse_gml_coord(xmlNodePtr xnode, bool *hasz)
Parse gml:coord.
static POINTARRAY * gml_reproject_pa(POINTARRAY *pa, int srid_in, int srid_out)
Use Proj4 to reproject a given POINTARRAY.
POINTARRAY * ptarray_flip_coordinates(POINTARRAY *pa)
Reverse X and Y axis on a given POINTARRAY.
Definition: ptarray.c:369
static xmlNodePtr get_xlink_node(xmlNodePtr xnode)
Return a xmlNodePtr on a node referenced by a XLink or NULL otherwise.
#define SRID_UNKNOWN
Unknown SRID value.
Definition: liblwgeom.h:187
static POINTARRAY * parse_gml_pos(xmlNodePtr xnode, bool *hasz)
Parse gml:pos.
static bool is_xlink(xmlNodePtr node)
Return true if current node contains a simple XLink Return false otherwise.
static POINTARRAY * parse_gml_data(xmlNodePtr xnode, bool *hasz, int *root_srid)
Parse data coordinates.
static bool is_gml_namespace(xmlNodePtr xnode, bool is_strict)
Return false if current element namespace is not a GML one Return true otherwise. ...
POINTARRAY * ptarray_merge(POINTARRAY *pa1, POINTARRAY *pa2)
Merge two given POINTARRAY and returns a pointer on the new aggregate one.
Definition: ptarray.c:603
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