public void Visit(IASTNode node) { if (node.Type == HqlSqlWalker.FROM) { _nodes.AddRange(node.Where(child => child.Type == HqlSqlWalker.RANGE).Select(range => range.GetChild(0))); } }
/// <summary> /// Handles HQL AST transformation for collection filters (which are created with <see cref="ISession.CreateFilter"/>). /// /// Adds FROM elements to implicit FROM clause. /// E.g., /// <code> /// ( query ( SELECT_FROM {filter-implied FROM} ) ( where ( = X 10 ) ) ) /// </code> /// gets converted to /// <code> /// ( query ( SELECT_FROM ( FROM NHibernate.DomainModel.Many this ) ) ( where ( = X 10 ) ) ) /// </code> /// </summary> /// <param name="ast">The root node of HQL query</param> /// <param name="collectionRole">Collection that is being filtered</param> /// <param name="factory">Session factory</param> internal static void AddImpliedFromToQuery(IASTNode ast, string collectionRole, ISessionFactoryImplementor factory) { if (ast.Type != HqlParser.QUERY) { var msg = string.Format(CultureInfo.InvariantCulture, "invalid query type for collection filtering: expected {0}, got {1}", HqlParser.tokenNames[HqlParser.QUERY], HqlParser.tokenNames[ast.Type]); throw new QueryException(msg); } var selectFromClause = ast.Where(x => x.Type == HqlParser.SELECT_FROM).Single(); var fromClause = selectFromClause.Where(x => x.Type == HqlParser.FROM).Single(); fromClause.Text = "FROM"; // Just for prettier debug output AddImpliedFromToFromNode(fromClause, collectionRole, factory); }