| /* |
| * 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 result variable expression. |
| * |
| * @version 2.5.1 |
| * @since 2.3 |
| * @author Pascal Filion |
| */ |
| public final class ResultVariableBNF extends JPQLQueryBNF { |
| |
| /** |
| * The unique identifier of this BNF rule, which is the same as {@link InternalSelectExpressionBNF#ID} |
| * in order to override it. |
| */ |
| public static final String ID = InternalSelectExpressionBNF.ID; |
| |
| /** |
| * Creates a new <code>ResultVariableBNF</code>. |
| */ |
| public ResultVariableBNF() { |
| super(ID); |
| } |
| |
| @Override |
| protected void initialize() { |
| |
| super.initialize(); |
| |
| setFallbackBNFId(ID); |
| setFallbackExpressionFactoryId(ResultVariableFactory.ID); |
| registerChild(SelectExpressionBNF.ID); |
| |
| // The ResultVariable's BNF is this one so it needs to be registered as a child of itself. |
| // This is required for validation to work properly. Basically, when checking if the select |
| // expression is valid, it checks its BNF with the non-compound children of this one |
| registerChild(ResultVariableBNF.ID); |
| } |
| } |