lwpointiterator_advance()

static int lwpointiterator_advance ( LWPOINTITERATOR *  s )

static

Definition at line 154 of file lwiterator.c.

References extract_pointarrays_from_lwgeom(), LWPOINTITERATOR::geoms, LWPOINTITERATOR::i, LISTNODE::item, LW_FAILURE, LW_SUCCESS, LWPOINTITERATOR::pointarrays, pop_node(), and unroll_collections().

Referenced by lwpointiterator_create_rw(), lwpointiterator_modify_next(), and lwpointiterator_next().

{
        s->i += 1;

        /* We've reached the end of our current POINTARRAY.  Try to see if there
         * are any more POINTARRAYS on the stack. */
        if (s->pointarrays && s->i >= ((POINTARRAY*) s->pointarrays->item)->npoints)
        {
                s->pointarrays = pop_node(s->pointarrays);
                s->i = 0;
        }

        /* We don't have a current POINTARRAY.  Pull a geometry from the stack, and
         * decompose it into its POINTARRARYs. */
        if (!s->pointarrays)
        {
                LWGEOM* g;
                unroll_collections(s);

                if (!s->geoms)
                {
                        return LW_FAILURE;
                }

                s->i = 0;
                g = s->geoms->item;
                s->pointarrays = extract_pointarrays_from_lwgeom(g);

                s->geoms = pop_node(s->geoms);
        }

        if (!s->pointarrays)
        {
                return LW_FAILURE;
        }
        return LW_SUCCESS;
}

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