static LWGEOM* lwgeom_extract_unique_endpoints ( const LWGEOM *  lwg )

static

Definition at line 86 of file lwgeom_geos_node.c.

References LWGEOM::flags, FLAGS_GET_Z, GEOS2LWGEOM(), lwerror(), LWGEOM2GEOS(), lwgeom_extract_endpoints(), lwgeom_geos_errmsg, lwmpoint_free(), and POSTGIS_GEOS_VERSION.

Referenced by lwgeom_node().

{
#if POSTGIS_GEOS_VERSION < 33
        lwerror("The GEOS version this postgis binary "
                "was compiled against (%d) doesn't support "
                "'GEOSUnaryUnion' function (3.3.0+ required)",
                POSTGIS_GEOS_VERSION);
        return NULL;
#else /* POSTGIS_GEOS_VERSION >= 33 */
        LWGEOM* ret;
        GEOSGeometry *gepu;
        LWMPOINT *epall = lwgeom_extract_endpoints(lwg);
        GEOSGeometry *gepall = LWGEOM2GEOS((LWGEOM*)epall);
        lwmpoint_free(epall);
        if ( ! gepall ) {
                lwerror("LWGEOM2GEOS: %s", lwgeom_geos_errmsg);
                return NULL;
        }

        /* UnaryUnion to remove duplicates */
        /* TODO: do it all within pgis using indices */
        gepu = GEOSUnaryUnion(gepall);
        if ( ! gepu ) {
                GEOSGeom_destroy(gepall);
                lwerror("GEOSUnaryUnion: %s", lwgeom_geos_errmsg);
                return NULL;
        }
        GEOSGeom_destroy(gepall);

        ret = GEOS2LWGEOM(gepu, FLAGS_GET_Z(lwg->flags));
        GEOSGeom_destroy(gepu);
        if ( ! ret ) {
                lwerror("Error during GEOS2LWGEOM");
                return NULL;
        }

        return ret;
#endif /* POSTGIS_GEOS_VERSION >= 33 */
}

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