LWGEOM_asGeoJson()

Datum LWGEOM_asGeoJson

(

PG_FUNCTION_ARGS

)

Definition at line 408 of file lwgeom_export.c.

References dumpnode::geom, getSRSbySRID(), gserialized_get_srid(), lwfree(), LWGEOM_asSVG(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_to_geojson(), PG_FUNCTION_INFO_V1(), precision, and SRID_UNKNOWN.

Referenced by LWGEOM_asGeoJson_old().

{
        GSERIALIZED *geom;
        LWGEOM *lwgeom;
        char *geojson;
        text *result;
        int has_bbox = 0;
        int precision = DBL_DIG;
        char *srs = NULL;

        /* Get the geometry */
        if ( PG_ARGISNULL(0) )
                PG_RETURN_NULL();

        geom = PG_GETARG_GSERIALIZED_P(0);

        /* Retrieve precision if any (default is max) */
        if ( PG_NARGS() > 1 && !PG_ARGISNULL(1) )
        {
                precision = PG_GETARG_INT32(1);
                if ( precision > DBL_DIG )
                        precision = DBL_DIG;
                else if ( precision < 0 )
                        precision = 0;
        }

        /* Retrieve output option
         * 0 = without option (default)
         * 1 = bbox
         * 2 = short crs
         * 4 = long crs
         */
        if ( PG_NARGS() > 2 && !PG_ARGISNULL(2) )
        {
                int option = PG_GETARG_INT32(2);

                if ( option & 2 || option & 4 )
                {
                        int srid = gserialized_get_srid(geom);
                        if ( srid != SRID_UNKNOWN )
                        {
                                if ( option & 2 )
                                        srs = getSRSbySRID(srid, true);

                                if ( option & 4 )
                                        srs = getSRSbySRID(srid, false);

                                if ( !srs )
                                {
                                        elog(ERROR,
                                              "SRID %i unknown in spatial_ref_sys table",
                                              srid);
                                        PG_RETURN_NULL();
                                }
                        }
                }

                if (option & 1)
                        has_bbox = 1;
        }

        lwgeom = lwgeom_from_gserialized(geom);
        geojson = lwgeom_to_geojson(lwgeom, srs, precision, has_bbox);
        lwgeom_free(lwgeom);

        if (srs) pfree(srs);

        result = cstring2text(geojson);
        lwfree(geojson);

        PG_FREE_IF_COPY(geom, 0);
        PG_RETURN_TEXT_P(result);
}

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