| /* |
| * Copyright (c) 2006, 2021 Oracle and/or its affiliates. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0, |
| * or the Eclipse Distribution License v. 1.0 which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause |
| */ |
| |
| // Contributors: |
| // Oracle - initial API and implementation |
| // |
| package org.eclipse.persistence.jpa.jpql.parser; |
| |
| /** |
| * The query BNF for a group by item expression. |
| * |
| * <div><b>BNF:</b> <code>groupby_item ::= single_valued_path_expression | identification_variable</code></div> |
| * |
| * @version 2.4 |
| * @since 2.3 |
| * @author Pascal Filion |
| */ |
| @SuppressWarnings("nls") |
| public final class GroupByItemBNF extends JPQLQueryBNF { |
| |
| /** |
| * The unique identifier of this BNF rule. |
| */ |
| public static final String ID = "groupby_item"; |
| |
| /** |
| * Creates a new <code>GroupByItemBNF</code>. |
| */ |
| public GroupByItemBNF() { |
| super(ID); |
| } |
| |
| @Override |
| protected void initialize() { |
| super.initialize(); |
| |
| // Technically, this BNF does not support collection but it's parent |
| // groupby_clause does. But this BNF is used by GroupByClause directly |
| // to parse the query so the flag has to be turned on here |
| setHandleCollection(true); |
| |
| setHandleAggregate(true); |
| setFallbackBNFId(ID); |
| setFallbackExpressionFactoryId(GroupByItemFactory.ID); |
| registerChild(SingleValuedPathExpressionBNF.ID); |
| registerChild(IdentificationVariableBNF.ID); |
| } |
| } |