dxobject.java

用Java写的面相对象的数据库管理系统

// You can redistribute this software and/or modify it under the terms of
// the Ozone Library License version 1 published by ozone-db.org.
//
// The original code and portions created by SMB are
// Copyright (C) 1997-2000 by SMB GmbH. All rights reserved.
//
// $Id: DxObject.java,v 1.8 2000/10/28 16:55:14 daniela Exp $

package org.ozoneDB.DxLib;


public class DxObject implements DxCompatible {
    
    final static long serialVersionUID = 1L;
    
    
    /**
     * Constructor
     */
    public DxObject() {
    }
    
    
    /**
     * liefert eine kopie des objektes;
     * sollte von subclasses ueberschrieben werden;
     */
    public Object clone() {
        try {
            return super.clone();
        } catch (Exception e) {
            throw new RuntimeException( e.toString() );
        } 
    } 
    
    
    /**
     */
    public boolean equals( Object obj ) {
        //The specification says that equals should never hrow an exception.
        //However, this seems a good way to find errors in the implementation.
        throw new RuntimeException( "equals(): subclass responsibility" );
    } 
    
    
    /**
     * true, wenn receiver echt kleiner als obj
     */
    public boolean isLess( DxCompatible obj ) {
        throw new RuntimeException( "isLess(): subclass responsibility" );
    } 
    
}