org.eclipse.persistence.jpa.jpql.parser.InternalConcatExpressionBNF Maven / Gradle / Ivy
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/*
* Copyright (c) 2006, 2018 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 COUNT expression's encapsulated expressions.
*
* JPA 1.0:
*
BNF: expression ::= CONCAT(string_primary, string_primary)
*
* JPA 2.0:
*
BNF: expression ::= CONCAT(string_primary, string_primary {, string_primary}*)
*
* JPA 2.1:
*
BNF: expression ::= CONCAT(string_expression, string_expression {, string_expression}*)
*
*
* @version 2.5
* @since 2.3
* @author Pascal Filion
*/
@SuppressWarnings("nls")
public final class InternalConcatExpressionBNF extends JPQLQueryBNF {
/**
* The unique identifier of this InternalConcatExpressionBNF.
*/
public final static String ID = "internal_concat";
/**
* Creates a new InternalConcatExpressionBNF.
*/
public InternalConcatExpressionBNF() {
super(ID);
}
/**
* {@inheritDoc}
*/
@Override
protected void initialize() {
super.initialize();
setHandleAggregate(true); // To support invalid queries
setHandleCollection(true);
setFallbackBNFId(LiteralExpressionFactory.ID);
registerChild(StringPrimaryBNF.ID);
}
}