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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 a select expression.
*
* JPA 1.0:
*
BNF: select_expression ::= single_valued_path_expression |
* aggregate_expression |
* identification_variable |
* OBJECT(identification_variable) |
* constructor_expression
*
* JPA 2.0:
*
BNF: select_expression ::= single_valued_path_expression |
* scalar_expression |
* aggregate_expression |
* identification_variable |
* OBJECT(identification_variable) |
* constructor_expression
*
*
* @version 2.5
* @since 2.3
* @author Pascal Filion
*/
@SuppressWarnings("nls")
public final class SelectExpressionBNF extends JPQLQueryBNF {
/**
* The unique identifier of this BNF rule.
*/
public static final String ID = "select_expression";
/**
* Creates a new SelectExpressionBNF.
*/
public SelectExpressionBNF() {
super(ID);
}
@Override
protected void initialize() {
super.initialize();
setHandleCollection(true);
setFallbackBNFId(ID);
setFallbackExpressionFactoryId(LiteralExpressionFactory.ID);
registerChild(AggregateExpressionBNF.ID);
registerChild(SingleValuedPathExpressionBNF.ID);
registerChild(IdentificationVariableBNF.ID);
registerChild(ObjectExpressionBNF.ID);
registerChild(ConstructorExpressionBNF.ID);
}
}