org.eclipse.persistence.jpa.jpql.parser.InternalFromClauseBNF Maven / Gradle / Ivy
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/*
* Copyright (c) 2006, 2020 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 the FROM declaration, basically what follows the
* FROM identifier.
*
* JPA:
*
BNF: from_clause ::= FROM identification_variable_declaration {, {identification_variable_declaration | collection_member_declaration}}*
*
* EclipseLink 2.4:
*
BNF: from_clause ::= FROM identification_variable_declaration {, {identification_variable_declaration |
* collection_member_declaration |
* (subquery) |
* table_declaration }}*
*
*
* @version 2.4
* @since 2.3
* @author Pascal Filion
*/
@SuppressWarnings("nls")
public final class InternalFromClauseBNF extends JPQLQueryBNF {
/**
* The unique identifier of this BNF rule.
*/
public static final String ID = "internal_from_clause";
/**
* Creates a new InternalFromClauseBNF.
*/
public InternalFromClauseBNF() {
super(ID);
}
@Override
protected void initialize() {
super.initialize();
setHandleAggregate(true); // To support invalid queries
setHandleCollection(true);
setFallbackBNFId(IdentificationVariableDeclarationBNF.ID);
registerExpressionFactory(CollectionMemberDeclarationBNF.ID);
registerChild(IdentificationVariableDeclarationBNF.ID);
}
}