isvalid()

Datum isvalid

(

PG_FUNCTION_ARGS

)

Definition at line 1456 of file postgis/lwgeom_geos.c.

{
        GSERIALIZED *geom1;
        LWGEOM *lwgeom;
        char result;
        GEOSGeom g1;
 
        geom1 = PG_GETARG_GSERIALIZED_P(0);
 
        /* Empty.IsValid() == TRUE */
        if ( gserialized_is_empty(geom1) )
                PG_RETURN_BOOL(true);
 
        initGEOS(lwpgnotice, lwgeom_geos_error);
 
        lwgeom = lwgeom_from_gserialized(geom1);
        if ( ! lwgeom )
        {
                lwpgerror("unable to deserialize input");
        }
        g1 = LWGEOM2GEOS(lwgeom, 0);
        lwgeom_free(lwgeom);
 
        if ( ! g1 )
        {
                /* should we drop the following
                 * notice now that we have ST_isValidReason ?
                 */
                lwpgnotice("%s", lwgeom_geos_errmsg);
                PG_RETURN_BOOL(false);
        }
 
        result = GEOSisValid(g1);
        GEOSGeom_destroy(g1);
 
        if (result == 2)
        {
                elog(ERROR,"GEOS isvalid() threw an error!");
                PG_RETURN_NULL(); /*never get here */
        }
 
        PG_FREE_IF_COPY(geom1, 0);
        PG_RETURN_BOOL(result);
}

References gserialized_is_empty(), LWGEOM2GEOS(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_geos_errmsg, and lwgeom_geos_error().

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