org.eclipse.persistence.jpa.jpql.parser.ScalarExpressionBNF Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of eclipselink Show documentation

EclipseLink build based upon Git transaction f2b9fc5

The newest version!

/*
 * 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 scalar expression.
 * 
 * JPA 1.0:
 * 
BNF: scalar_expression ::= simple_arithmetic_expression |
 *                                                     string_primary |
 *                                                     enum_primary |
 *                                                     datetime_primary |
 *                                                     boolean_primary
 *
 * JPA 2.0
 * BNF: scalar_expression ::= simple_arithmetic_expression |
 *                                                     string_primary |
 *                                                     enum_primary |
 *                                                     datetime_primary |
 *                                                     boolean_primary |
 *                                                     case_expression |
 *                                                     entity_type_expression
 *
 * @version 2.5
 * @since 2.3
 * @author Pascal Filion
 */
@SuppressWarnings("nls")
public final class ScalarExpressionBNF extends JPQLQueryBNF {

    /**
     * The unique identifier of this BNF rule.
     */
    public static final String ID = "scalar_expression";

    /**
     * Creates a new SelectExpressionBNF.
     */
    public ScalarExpressionBNF() {
        super(ID);
    }

    @Override
    protected void initialize() {
        super.initialize();
        setFallbackBNFId(ID);
        setFallbackExpressionFactoryId(LiteralExpressionFactory.ID);
        registerChild(SimpleArithmeticExpressionBNF.ID);
        registerChild(StringPrimaryBNF.ID);
        registerChild(EnumPrimaryBNF.ID);
        registerChild(DateTimePrimaryBNF.ID);
        registerChild(BooleanPrimaryBNF.ID);
    }
}