org.eclipse.persistence.jpa.jpql.parser.InternalColumnExpressionBNF 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

There is a newer version: 5.0.0-B03

/*
 * Copyright (c) 2012, 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 items of a COLUMN expression.
 *
 * BNF: column_expression ::= COLUMN('function' {, [single_valued_object_path_expression | identification_variable]}+)
 *
 * @version 2.5
 * @since 2.4
 * @author Pascal Filion
 */
@SuppressWarnings("nls")
public final class InternalColumnExpressionBNF extends JPQLQueryBNF {

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

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

    @Override
    protected void initialize() {
        super.initialize();
        setHandleCollection(true); // For invalid queries
        setFallbackBNFId(ID);
        setFallbackExpressionFactoryId(LiteralExpressionFactory.ID);
        registerChild(SingleValuedObjectPathExpressionBNF.ID);
        registerChild(StateFieldPathExpressionBNF.ID);
        registerChild(IdentificationVariableBNF.ID);
    }
}