relate_pattern()

Datum relate_pattern

(

PG_FUNCTION_ARGS

)

Definition at line 2486 of file postgis/lwgeom_geos.c.

{
        GSERIALIZED *geom1;
        GSERIALIZED *geom2;
        char *patt;
        text *ptxt;
        char result;
        GEOSGeometry *g1, *g2;
        size_t i;
 
        geom1 = PG_GETARG_GSERIALIZED_P(0);
        geom2 = PG_GETARG_GSERIALIZED_P(1);
        gserialized_error_if_srid_mismatch(geom1, geom2, __func__);
 
        /* TODO handle empty */
 
        initGEOS(lwpgnotice, lwgeom_geos_error);
 
        g1 = POSTGIS2GEOS(geom1);
        if (!g1)
                HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
        g2 = POSTGIS2GEOS(geom2);
        if (!g2)
        {
                GEOSGeom_destroy(g1);
                HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
        }
 
        /* Ensure DE9IM pattern is no more than 9 chars */
        ptxt = DatumGetTextP(DirectFunctionCall2(text_left,
                       PG_GETARG_DATUM(2), Int32GetDatum(9)));
        patt = text_to_cstring(ptxt);
 
        /*
        ** Need to make sure 't' and 'f' are upper-case before handing to GEOS
        */
        for ( i = 0; i < strlen(patt); i++ )
        {
                if ( patt[i] == 't' ) patt[i] = 'T';
                if ( patt[i] == 'f' ) patt[i] = 'F';
        }
 
        result = GEOSRelatePattern(g1,g2,patt);
        GEOSGeom_destroy(g1);
        GEOSGeom_destroy(g2);
        pfree(patt);
 
        if (result == 2) HANDLE_GEOS_ERROR("GEOSRelatePattern");
 
        PG_FREE_IF_COPY(geom1, 0);
        PG_FREE_IF_COPY(geom2, 1);
 
        PG_RETURN_BOOL(result);
}

References gserialized_error_if_srid_mismatch(), HANDLE_GEOS_ERROR, lwgeom_geos_error(), POSTGIS2GEOS(), and result.

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