public class YourLabelProvider extends LabelProvider {

    @Override
    public String getText(Object element) {
        /*
         * Override this method and return null activate DLTK's default
         * behavior. Else way, parent class just returns toString(), which is
         * less convenient
         */
        return null;
    }

    @Override
    public Image getImage(Object element) {
        IMember member = getMember(element);
        if (member == null)
            return null;
        try {
            if (member.exists()) {
            int flags = member.getFlags();
            // Special icon for private type
            if (member instanceof IType
                && (flags & Modifiers.AccPrivate) != 0)
                return getPrivateMethodIcon();
            }
        } catch (Exception e) {
        }
        // Stick to default DLTK behavior
        return null;
    }

    private IMember getMember(Object element) {
        if (element instanceof IMember) {
            return (IMember) element;
        }
        return null;
    }

    private Image getPrivateMethodIcon() throws IOException {
        return Activator.getImage("/img/class_obj.gif");
    }

}