if (list.size() < 1) return;
    private void prefetchChildren(int start, int length) {        if (list.size() < 1)            return;        if (!(node instanceof helma.objectmodel.db.Node))            return;        if (length < 1)            return;        if (start < 0)            return;        if (start >= list.size())            return;        checkNode();        int l = Math.min(list.size() - start, length);        if (l < 1)            return;        Key[] keys = new Key[l];        for (int i = start; i<start+l; i++) {            keys[i] = ((NodeHandle) list.get(i)).getKey();        }        try {            ((helma.objectmodel.db.Node) node).prefetchChildren(keys);        } catch (Exception ignore) {            System.err.println("Error in HopObject.prefetchChildren(): "+ignore);        }    }