freespace.java

Java的面向对象数据库系统的源代码

// You can redistribute this software and/or modify it under the terms of
// the Ozone Core License version 1 published by ozone-db.org.
//
// Copyright (C) 2003-@year@, Leo Mekenkamp. All rights reserved.
//
// $Id: FreeSpace.java,v 1.1.2.1 2004/04/10 10:06:51 per_nyfelt Exp $

package org.ozoneDB.core.storage.gammaStore;

import java.util.Comparator;

public final class FreeSpace {

    private static Comparator sizeComparator = new Comparator() {
        
        public int compare(Object o1, Object o2) {
            return compare((FreeSpace) o1, (FreeSpace) o2);
        }
        
        private int compare(FreeSpace o1, FreeSpace o2) {
            if (o1 == o2) {
                return 0;
            }
            if (o1 == null) {
                return -1;
            }
            if (o2 == null) {
                return 1;
            }
            int result = o1.getSize() - o2.getSize();
            if (result == 0) {
                result = o1.getClusterId() - o2.getClusterId();
                if (result == 0) {
                    result = o1.getLocation() - o2.getLocation();
                }
            }
            return result;
        }
    };
    
    public static Comparator getSizeComparator() {
        return sizeComparator;
    }
    
    private int clusterId;
    private int location;
    private int size;
    
    public FreeSpace(int clusterId, int location, int size) {
        this.clusterId = clusterId;
        this.location = location;
        this.size = size;
    }
    
    public int getClusterId() {
        return clusterId;
    }

    public int getLocation() {
        return location;
    }
    
    public int getSize() {
        return size;
    }
    
    public int hashCode() {
        return (clusterId + 1) * location;
    }    
    
}