org.eclipse.persistence.internal.helper.MappingCompare 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) 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.helper;

import java.io.Serializable;
import java.util.Comparator;

import org.eclipse.persistence.mappings.DatabaseMapping;

/**
 * INTERNAL:
 * Use to Sort The mappings in ClassDescriptor, Mappings are either DirectToField, which must be at the top
 * or other
 * Avoid using this class as sun.misc is not part of many VM's like Netscapes.
 *
 */
public class MappingCompare implements Comparator, Serializable {

    private static final long serialVersionUID = -2749222441763925989L;

    @Override
    public int compare(Object arg1, Object arg2) {
        int arg1Value = ((DatabaseMapping)arg1).getWeight().intValue();
        int arg2Value = ((DatabaseMapping)arg2).getWeight().intValue();
        if (arg1Value == arg2Value) {
            int result = ((DatabaseMapping)arg1).getClass().getName().compareTo(((DatabaseMapping)arg2).getClass().getName());
            // For same classes, compare attribute names.
            if (result == 0) {
                // Can be null for TransformationMapping.
                if (((DatabaseMapping)arg1).getAttributeName() != null && ((DatabaseMapping)arg2).getAttributeName() != null) {
                    result = ((DatabaseMapping)arg1).getAttributeName().compareTo(((DatabaseMapping)arg2).getAttributeName());
                }
            }
            return result;
        }
        return (arg1Value - arg2Value);
    }
}