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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 a comparison expression.
 * 
 * JPA 1.0:
 * 
BNF: comparison_expression ::= string_expression comparison_operator {string_expression | all_or_any_expression} |
 *                                                         boolean_expression { = | {@literal <>} } {boolean_expression | all_or_any_expression} |
 *                                                         enum_expression { = | {@literal <>} } {enum_expression | all_or_any_expression} |
 *                                                         datetime_expression comparison_operator {datetime_expression | all_or_any_expression} |
 *                                                         entity_expression { = | {@literal <>} } {entity_expression | all_or_any_expression} |
 *                                                         arithmetic_expression comparison_operator {arithmetic_expression | all_or_any_expression}
 * 
 * JPA 2.0, 2.1:
 * BNF: comparison_expression ::= string_expression comparison_operator {string_expression | all_or_any_expression} |
 *                                                         boolean_expression { = | {@literal <>} } {boolean_expression | all_or_any_expression} |
 *                                                         enum_expression { = | {@literal <>} } {enum_expression | all_or_any_expression} |
 *                                                         datetime_expression comparison_operator {datetime_expression | all_or_any_expression} |
 *                                                         entity_expression { = | {@literal <>} } {entity_expression | all_or_any_expression} |
 *                                                         arithmetic_expression comparison_operator {arithmetic_expression | all_or_any_expression} |
 *                                                         entity_type_expression { = | {@literal <>} } entity_type_expression}
 * 
 *
 * @version 2.5
 * @since 2.3
 * @author Pascal Filion
 */
@SuppressWarnings("nls")
public final class ComparisonExpressionBNF extends JPQLQueryBNF {

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

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

    /**
     * {@inheritDoc}
     */
    @Override
    protected void initialize() {
        super.initialize();
        setCompound(true);
        setFallbackBNFId(ID);
        setFallbackExpressionFactoryId(LiteralExpressionFactory.ID);
        registerExpressionFactory(ComparisonExpressionFactory.ID);
        registerChild(AllOrAnyExpressionBNF.ID);
        registerChild(ArithmeticExpressionBNF.ID);
        registerChild(BooleanExpressionBNF.ID);
        registerChild(DatetimeExpressionBNF.ID);
        registerChild(EntityExpressionBNF.ID);
        registerChild(EnumExpressionBNF.ID);
        registerChild(StringExpressionBNF.ID);
    }
}