ST_Equals()

Datum ST_Equals

(

PG_FUNCTION_ARGS

)

Definition at line 2706 of file postgis/lwgeom_geos.c.

{
        GSERIALIZED *geom1;
        GSERIALIZED *geom2;
        GEOSGeometry *g1, *g2;
        char result;
        GBOX box1, box2;
 
        geom1 = PG_GETARG_GSERIALIZED_P(0);
        geom2 = PG_GETARG_GSERIALIZED_P(1);
        gserialized_error_if_srid_mismatch(geom1, geom2, __func__);
 
        /* Empty == Empty */
        if ( gserialized_is_empty(geom1) && gserialized_is_empty(geom2) )
                PG_RETURN_BOOL(true);
 
        /*
         * short-circuit: If geom1 and geom2 do not have the same bounding box
         * we can return FALSE.
         */
        if ( gserialized_get_gbox_p(geom1, &box1) &&
             gserialized_get_gbox_p(geom2, &box2) )
        {
                if ( gbox_same_2d_float(&box1, &box2) == LW_FALSE )
                {
                        PG_RETURN_BOOL(false);
                }
        }
 
        /*
         * short-circuit: if geom1 and geom2 are binary-equivalent, we can return
         * TRUE.  This is much faster than doing the comparison using GEOS.
         */
        if (VARSIZE(geom1) == VARSIZE(geom2) && !memcmp(geom1, geom2, VARSIZE(geom1))) {
            PG_RETURN_BOOL(true);
        }
 
        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");
        }
 
        result = GEOSEquals(g1,g2);
 
        GEOSGeom_destroy(g1);
        GEOSGeom_destroy(g2);
 
        if (result == 2) HANDLE_GEOS_ERROR("GEOSEquals");
 
        PG_FREE_IF_COPY(geom1, 0);
        PG_FREE_IF_COPY(geom2, 1);
 
        PG_RETURN_BOOL(result);
}

References gbox_same_2d_float(), gserialized_error_if_srid_mismatch(), gserialized_get_gbox_p(), gserialized_is_empty(), HANDLE_GEOS_ERROR, LW_FALSE, lwgeom_geos_error(), POSTGIS2GEOS(), and result.

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