foundation/org.eclipse.persistence.core/src/main/java/org/eclipse/persistence/internal/jpa/parsing/SortDirectionNode.java

/*
 * Copyright (c) 1998, 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 from Oracle TopLink
package org.eclipse.persistence.internal.jpa.parsing;


/**
 * INTERNAL
 * <p><b>Purpose</b>: Represent a Sort Direction for an
 * Order By Item
 * <p><b>Responsibilities</b>:<ul>
 * <li> Apply itself to a query correctly
 *
 * This node represents either an ASC or DESC encountered on the input stream
 * e.g SELECT ... FROM ... WHERE ... ORDER BY emp.salary ASC
 * </ul>
 *    @author Jon Driscoll
 *    @since TopLink 5.0
 */
import org.eclipse.persistence.expressions.Expression;
import org.eclipse.persistence.expressions.ExpressionOperator;

public class SortDirectionNode extends Node {
    private int sortDirection = ExpressionOperator.Ascending;

    /**
     * INTERNAL
     * Return the parent expression unmodified
     */
    @Override
    public Expression addToExpression(Expression parentExpression, GenerationContext context) {
        return parentExpression.getFunction(getSortDirection());
    }

    public void useAscending() {
        setSortDirection(ExpressionOperator.Ascending);
    }

    public void useDescending() {
        setSortDirection(ExpressionOperator.Descending);
    }

    // Accessors
    public int getSortDirection() {
        return sortDirection;
    }

    public void setSortDirection(int sortDirection) {
        this.sortDirection = sortDirection;
    }
}