* @param ast a given node.
     * @return whether we should check a given node.
     */
    private boolean shouldCheck(final DetailAST ast) {
        final Scope customScope;

        if (ScopeUtil.isInInterfaceOrAnnotationBlock(ast)) {
            customScope = Scope.PUBLIC;
        } else {
            final DetailAST mods = ast.findFirstToken(TokenTypes.MODIFIERS);
            customScope = ScopeUtil.getScopeFromMods(mods);