PostGIS  2.1.10dev-r@@SVN_REVISION@@
static LWGEOM* parse_gml_polygon ( xmlNodePtr  xnode,
bool *  hasz,
int *  root_srid 
)
static

Parse GML Polygon (2.1.2, 3.1.1)

Definition at line 1120 of file lwgeom_in_gml.c.

References get_xlink_node(), gml_lwerror(), gml_reproject_pa(), is_gml_namespace(), is_xlink(), lwalloc(), lwpoly_as_lwgeom(), lwpoly_construct(), lwpoly_construct_empty(), lwrealloc(), parse_gml_data(), parse_gml_srs(), ptarray_flip_coordinates(), ptarray_is_closed_2d(), ptarray_is_closed_3d(), struct_gmlSrs::reverse_axis, struct_gmlSrs::srid, and SRID_UNKNOWN.

Referenced by parse_gml().

1121 {
1122  gmlSrs srs;
1123  int i, ring;
1124  LWGEOM *geom;
1125  xmlNodePtr xa, xb;
1126  POINTARRAY **ppa = NULL;
1127 
1128  if (is_xlink(xnode)) xnode = get_xlink_node(xnode);
1129 
1130  if (xnode->children == NULL)
1131  return lwpoly_as_lwgeom(lwpoly_construct_empty(*root_srid, 0, 0));
1132 
1133  parse_gml_srs(xnode, &srs);
1134 
1135  for (xa = xnode->children ; xa != NULL ; xa = xa->next)
1136  {
1137  /* Polygon/outerBoundaryIs -> GML 2.1.2 */
1138  /* Polygon/exterior -> GML 3.1.1 */
1139  if (xa->type != XML_ELEMENT_NODE) continue;
1140  if (!is_gml_namespace(xa, false)) continue;
1141  if (strcmp((char *) xa->name, "outerBoundaryIs") &&
1142  strcmp((char *) xa->name, "exterior")) continue;
1143 
1144  for (xb = xa->children ; xb != NULL ; xb = xb->next)
1145  {
1146  if (xb->type != XML_ELEMENT_NODE) continue;
1147  if (!is_gml_namespace(xb, false)) continue;
1148  if (strcmp((char *) xb->name, "LinearRing")) continue;
1149 
1150  ppa = (POINTARRAY**) lwalloc(sizeof(POINTARRAY*));
1151  ppa[0] = parse_gml_data(xb->children, hasz, root_srid);
1152 
1153  if (ppa[0]->npoints < 4
1154  || (!*hasz && !ptarray_is_closed_2d(ppa[0]))
1155  || (*hasz && !ptarray_is_closed_3d(ppa[0])))
1156  gml_lwerror("invalid GML representation", 43);
1157 
1158  if (srs.reverse_axis) ppa[0] = ptarray_flip_coordinates(ppa[0]);
1159  }
1160  }
1161 
1162  /* Found an <exterior> or <outerBoundaryIs> but no rings?!? We're outa here! */
1163  if ( ! ppa )
1164  gml_lwerror("invalid GML representation", 43);
1165 
1166  for (ring=1, xa = xnode->children ; xa != NULL ; xa = xa->next)
1167  {
1168  /* Polygon/innerBoundaryIs -> GML 2.1.2 */
1169  /* Polygon/interior -> GML 3.1.1 */
1170  if (xa->type != XML_ELEMENT_NODE) continue;
1171  if (!is_gml_namespace(xa, false)) continue;
1172  if (strcmp((char *) xa->name, "innerBoundaryIs") &&
1173  strcmp((char *) xa->name, "interior")) continue;
1174 
1175  for (xb = xa->children ; xb != NULL ; xb = xb->next)
1176  {
1177  if (xb->type != XML_ELEMENT_NODE) continue;
1178  if (!is_gml_namespace(xb, false)) continue;
1179  if (strcmp((char *) xb->name, "LinearRing")) continue;
1180 
1181  ppa = (POINTARRAY**) lwrealloc((POINTARRAY *) ppa,
1182  sizeof(POINTARRAY*) * (ring + 1));
1183  ppa[ring] = parse_gml_data(xb->children, hasz, root_srid);
1184 
1185  if (ppa[ring]->npoints < 4
1186  || (!*hasz && !ptarray_is_closed_2d(ppa[ring]))
1187  || (*hasz && !ptarray_is_closed_3d(ppa[ring])))
1188  gml_lwerror("invalid GML representation", 43);
1189 
1190  if (srs.reverse_axis) ppa[ring] = ptarray_flip_coordinates(ppa[ring]);
1191  ring++;
1192  }
1193  }
1194 
1195  /* Exterior Ring is mandatory */
1196  if (ppa == NULL || ppa[0] == NULL) gml_lwerror("invalid GML representation", 44);
1197 
1198  if (srs.srid != *root_srid && *root_srid != SRID_UNKNOWN)
1199  {
1200  for (i=0 ; i < ring ; i++)
1201  gml_reproject_pa(ppa[i], srs.srid, *root_srid);
1202  }
1203  geom = (LWGEOM *) lwpoly_construct(*root_srid, NULL, ring, ppa);
1204 
1205  return geom;
1206 }
static void parse_gml_srs(xmlNodePtr xnode, gmlSrs *srs)
Parse gml srsName attribute.
int ptarray_is_closed_3d(const POINTARRAY *pa)
Definition: ptarray.c:678
int ptarray_is_closed_2d(const POINTARRAY *pa)
Definition: ptarray.c:672
LWGEOM * lwpoly_as_lwgeom(const LWPOLY *obj)
Definition: lwgeom.c:239
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.
LWGEOM * geom
LWPOLY * lwpoly_construct(int srid, GBOX *bbox, uint32_t nrings, POINTARRAY **points)
Definition: lwpoly.c:29
#define SRID_UNKNOWN
Unknown SRID value.
Definition: liblwgeom.h:154
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. ...
void * lwrealloc(void *mem, size_t size)
Definition: lwutil.c:183
LWPOLY * lwpoly_construct_empty(int srid, char hasz, char hasm)
Definition: lwpoly.c:66
static void gml_lwerror(char *msg, int error_code)
Definition: lwgeom_in_gml.c:68
void * lwalloc(size_t size)
Definition: lwutil.c:175

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