entity.java

来自「Rapla是一个灵活的多用户资源管理系统。它提供的一些功能有：日历GUI」· Java 代码 · 共 39 行

/*--------------------------------------------------------------------------*
 | Copyright (C) 2006 Christopher Kohlhaas                                  |
 |                                                                          |
 | This program is free software; you can redistribute it and/or modify     |
 | it under the terms of the GNU General Public License as published by the |
 | Free Software Foundation. A copy of the license has been included with   |
 | these distribution in the COPYING file, if not go to www.fsf.org         |
 |                                                                          |
 | As a special exception, you are granted the permissions to link this     |
 | program with every library, which license fulfills the Open Source       |
 | Definition as published by the Open Source Initiative (OSI).             |
 *--------------------------------------------------------------------------*/
package org.rapla.entities;

public interface Entity extends RaplaObject {
    /** To identities are identical, if they represent
        the same object. */
    boolean isIdentical(Entity id2);

    /** returns if the instance of the entity is persisant and the cache or just a local copy.
     * Persistant objects are usably not editable and are updated in a multiuser system.
     * Persistant instances with the same id should therefore have the same content and
     * <code>persistant1.isIdentical(persistant2)</code> implies <code>persistant1 == persistant2</code>.
     * A non persistant instance has never the same reference as the persistant entity with the same id.
     * <code>persistant1.isIdentical(nonPersitant1)</code> implies <code>persistant1 != nonPersistant2</code>.
     */
    boolean isPersistant();

    public static Entity[] ENTITY_ARRAY = new Entity[0];

}