PostGIS  2.1.10dev-r@@SVN_REVISION@@
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 827 of file lwgeom_in_gml.c.

References get_xlink_node(), gml_lwerror(), 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().

828 {
829  POINTARRAY *pa = 0, *tmp_pa = 0;
830  xmlNodePtr xa, xb;
831  gmlSrs srs;
832  bool found;
833 
834  pa = NULL;
835 
836  for (xa = xnode ; xa != NULL ; xa = xa->next)
837  {
838  if (xa->type != XML_ELEMENT_NODE) continue;
839  if (!is_gml_namespace(xa, false)) continue;
840  if (xa->name == NULL) continue;
841 
842  if (!strcmp((char *) xa->name, "pos"))
843  {
844  tmp_pa = parse_gml_pos(xa, hasz);
845  if (pa == NULL) pa = tmp_pa;
846  else pa = ptarray_merge(pa, tmp_pa);
847 
848  }
849  else if (!strcmp((char *) xa->name, "posList"))
850  {
851  tmp_pa = parse_gml_poslist(xa, hasz);
852  if (pa == NULL) pa = tmp_pa;
853  else pa = ptarray_merge(pa, tmp_pa);
854 
855  }
856  else if (!strcmp((char *) xa->name, "coordinates"))
857  {
858  tmp_pa = parse_gml_coordinates(xa, hasz);
859  if (pa == NULL) pa = tmp_pa;
860  else pa = ptarray_merge(pa, tmp_pa);
861 
862  }
863  else if (!strcmp((char *) xa->name, "coord"))
864  {
865  tmp_pa = parse_gml_coord(xa, hasz);
866  if (pa == NULL) pa = tmp_pa;
867  else pa = ptarray_merge(pa, tmp_pa);
868 
869  }
870  else if (!strcmp((char *) xa->name, "pointRep") ||
871  !strcmp((char *) xa->name, "pointProperty"))
872  {
873 
874  found = false;
875  for (xb = xa->children ; xb != NULL ; xb = xb->next)
876  {
877  if (xb->type != XML_ELEMENT_NODE) continue;
878  if (!is_gml_namespace(xb, false)) continue;
879  if (!strcmp((char *) xb->name, "Point"))
880  {
881  found = true;
882  break;
883  }
884  }
885  if (!found || xb == NULL)
886  gml_lwerror("invalid GML representation", 29);
887 
888  if (is_xlink(xb)) xb = get_xlink_node(xb);
889  if (xb == NULL || xb->children == NULL)
890  gml_lwerror("invalid GML representation", 30);
891 
892  tmp_pa = parse_gml_data(xb->children, hasz, root_srid);
893  if (tmp_pa->npoints != 1)
894  gml_lwerror("invalid GML representation", 31);
895 
896  parse_gml_srs(xb, &srs);
897  if (srs.reverse_axis) tmp_pa = ptarray_flip_coordinates(tmp_pa);
898  if (*root_srid == SRID_UNKNOWN) *root_srid = srs.srid;
899  else if (srs.srid != *root_srid)
900  gml_reproject_pa(tmp_pa, srs.srid, *root_srid);
901  if (pa == NULL) pa = tmp_pa;
902  else pa = ptarray_merge(pa, tmp_pa);
903  }
904  }
905 
906  if (pa == NULL) gml_lwerror("invalid GML representation", 32);
907 
908  return pa;
909 }
static POINTARRAY * parse_gml_poslist(xmlNodePtr xnode, bool *hasz)
Parse gml:posList.
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:354
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:154
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. ...
static void gml_lwerror(char *msg, int error_code)
Definition: lwgeom_in_gml.c:68
POINTARRAY * ptarray_merge(POINTARRAY *pa1, POINTARRAY *pa2)
Merge two given POINTARRAY and returns a pointer on the new aggregate one.
Definition: ptarray.c:588

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