permissions.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 Core 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: Permissions.java,v 1.14 2000/10/28 16:55:17 daniela Exp $

package org.ozoneDB.core;

import java.util.*;
import java.io.*;
import org.ozoneDB.DxLib.*;
import org.ozoneDB.*;


/**
 * Ownership and access rights of a database object (aka ObjectContainer).
 * 
 * 
 * @author <a href="http://www.softwarebuero.de/">SMB</a>
 * @version $Revision: 1.14 $Date: 2000/10/28 16:55:17 $
 */
public final class Permissions extends DxObject implements Externalizable {
    
    final static long serialVersionUID = 2;
    final static byte subSerialVersionUID = 1;
    
    protected int ownerID;
    
    protected byte data;
    
    
    /**
     * Constructor for readObject().
     */
    public Permissions() {
    }
    
    
    /**
     * Constructor. owner wird nicht neu erzeugt damit nur die user in
     * der user-tabelle im ObjectSpace existieren.
     */
    public Permissions( User _owner, int _data ) {
        ownerID = _owner.id;
        data = (byte)_data;
    }
    
    
    public void setOwner( User user ) {
        ownerID = user.id;
    } 
    
    
    public Object clone() {
        Permissions obj = new Permissions();
        obj.ownerID = ownerID;
        obj.data = data;
        return obj;
    } 
    
    
    public int hashCode() {
        int msb = data;
        msb = msb << 24;
        return ownerID | msb;
    } 
    
    
    public boolean equals( Object obj ) {
        if (obj != null && obj instanceof Permissions) {
            Permissions rhs = (Permissions)obj;
            if (ownerID == rhs.ownerID && data == rhs.data) {
                return true;
            } 
        } 
        return false;
    } 
    
    
    public void writeExternal( ObjectOutput out ) throws IOException {
        out.writeByte( subSerialVersionUID );
        
        out.writeInt( ownerID );
        out.writeByte( data );
    } 
    
    
    public void readExternal( ObjectInput in ) throws IOException, ClassNotFoundException {
        byte streamVersionUID = in.readByte();
        
        ownerID = in.readInt();
        data = in.readByte();
    } 
    
    
    public boolean groupRead() {
        return (data & OzoneInterface.GroupRead) > 0;
    } 
    
    
    public boolean groupLock() {
        return (data & OzoneInterface.GroupLock) > 0;
    } 
    
    
    public boolean allRead() {
        return (data & OzoneInterface.AllRead) > 0;
    } 
    
    
    public boolean allLock() {
        return (data & OzoneInterface.AllLock) > 0;
    } 
}