isvaliddetail()

Datum isvaliddetail

(

PG_FUNCTION_ARGS

)

Definition at line 1655 of file postgis/lwgeom_geos.c.

{
        GSERIALIZED *geom = NULL;
        const GEOSGeometry *g1 = NULL;
        char *values[3]; /* valid bool, reason text, location geometry */
        char *geos_reason = NULL;
        char *reason = NULL;
        GEOSGeometry *geos_location = NULL;
        LWGEOM *location = NULL;
        char valid = 0;
        HeapTupleHeader result;
        TupleDesc tupdesc;
        HeapTuple tuple;
        AttInMetadata *attinmeta;
        int flags = 0;
 
        /*
         * Build a tuple description for a
         * valid_detail tuple
         */
        get_call_result_type(fcinfo, 0, &tupdesc);
        BlessTupleDesc(tupdesc);
 
        /*
         * generate attribute metadata needed later to produce
         * tuples from raw C strings
         */
        attinmeta = TupleDescGetAttInMetadata(tupdesc);
 
        geom = PG_GETARG_GSERIALIZED_P(0);
        flags = PG_GETARG_INT32(1);
 
        initGEOS(lwpgnotice, lwgeom_geos_error);
 
        g1 = POSTGIS2GEOS(geom);
 
        if ( g1 )
        {
                valid = GEOSisValidDetail(g1, flags, &geos_reason, &geos_location);
                GEOSGeom_destroy((GEOSGeometry *)g1);
                if ( geos_reason )
                {
                        reason = pstrdup(geos_reason);
                        GEOSFree(geos_reason);
                }
                if ( geos_location )
                {
                        location = GEOS2LWGEOM(geos_location, GEOSHasZ(geos_location));
                        GEOSGeom_destroy(geos_location);
                }
 
                if (valid == 2)
                {
                        /* NOTE: should only happen on OOM or similar */
                        lwpgerror("GEOS isvaliddetail() threw an exception!");
                        PG_RETURN_NULL(); /* never gets here */
                }
        }
        else
        {
                /* TODO: check lwgeom_geos_errmsg for validity error */
                reason = pstrdup(lwgeom_geos_errmsg);
        }
 
        /* the boolean validity */
        values[0] =  valid ? "t" : "f";
 
        /* the reason */
        values[1] =  reason;
 
        /* the location */
        values[2] = location ? lwgeom_to_hexwkb_buffer(location, WKB_EXTENDED) : 0;
 
        tuple = BuildTupleFromCStrings(attinmeta, values);
        result = (HeapTupleHeader) palloc(tuple->t_len);
        memcpy(result, tuple->t_data, tuple->t_len);
        heap_freetuple(tuple);
 
        PG_RETURN_HEAPTUPLEHEADER(result);
}

References lwgeom_geos_errmsg, lwgeom_geos_error(), lwgeom_to_hexwkb_buffer(), POSTGIS2GEOS(), result, and WKB_EXTENDED.

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