parse_geojson_polygon()

static LWGEOM* parse_geojson_polygon ( json_object *  geojson, int *  hasz, int  root_srid  )

static

Definition at line 226 of file lwin_geojson.c.

{
        POINTARRAY **ppa = NULL;
        json_object* rings = NULL;
        json_object* points = NULL;
        int i = 0, j = 0;
        int nRings = 0, nPoints = 0;
 
        rings = findMemberByName( geojson, "coordinates" );
        if ( ! rings )
        {
                geojson_lwerror("Unable to find 'coordinates' in GeoJSON string", 4);
                return NULL;
        }
 
        if ( json_type_array != json_object_get_type(rings) )
        {
                geojson_lwerror("The 'coordinates' in GeoJSON are not an array", 4);
                return NULL;
        }
 
        nRings = json_object_array_length( rings );
 
        /* No rings => POLYGON EMPTY */
        if ( ! nRings )
        {
                return (LWGEOM *)lwpoly_construct_empty(root_srid, 0, 0);
        }
 
        for ( i = 0; i < nRings; i++ )
        {
                points = json_object_array_get_idx(rings, i);
                if ( ! points || json_object_get_type(points) != json_type_array )
                {
                        geojson_lwerror("The 'coordinates' in GeoJSON ring are not an array", 4);
                        return NULL;
                }
                nPoints = json_object_array_length(points);
 
                if ( ! ppa )
                        ppa = (POINTARRAY**)lwalloc(sizeof(POINTARRAY*) * nRings);
 
                ppa[i] = ptarray_construct_empty(1, 0, 1);
                for ( j = 0; j < nPoints; j++ )
                {
                        json_object* coords = NULL;
                        coords = json_object_array_get_idx( points, j );
                        if (LW_FAILURE == parse_geojson_coord(coords, hasz, ppa[i]))
                        {
                                int k;
                                for (k = 0; k <= i; k++)
                                {
                                        ptarray_free(ppa[k]);
                                }
                                lwfree(ppa);
                                geojson_lwerror("The 'coordinates' in GeoJSON polygon are not sufficiently nested", 4);
                                return NULL;
                        }
                }
        }
 
        /* All the rings were empty! */
        if ( ! ppa )
                return (LWGEOM *)lwpoly_construct_empty(root_srid, 0, 0);
 
        return (LWGEOM *) lwpoly_construct(root_srid, NULL, nRings, ppa);
}

References findMemberByName(), geojson_lwerror(), LW_FAILURE, lwalloc(), lwfree(), lwpoly_construct(), lwpoly_construct_empty(), parse_geojson_coord(), ptarray_construct_empty(), and ptarray_free().

Referenced by parse_geojson().

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