UndoablePair.java

/*
** Module   : UndoablePair.java
** Abstract : helper class for a source and copy association
**
** Copyright (c) 2008-2017, Golden Code Development Corporation.
**
** -#- -I- --Date-- --JPRM-- ----------------------------Description------------------------------
** 001 GES 20080505 @38212   Provides a simple association between the source and copy undoable 
**                           instances.
** 002 CA  20160629          Reworked undoable support - the undoables register themselves with
**                           all blocks up the stack, until either 1. the tx block which created
**                           it is reached or 2. the last tx block where it was saved is reached.
*/
/*
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU Affero General Public License as
** published by the Free Software Foundation, either version 3 of the
** License, or (at your option) any later version.
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
** GNU Affero General Public License for more details.
**
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** location: https://www.gnu.org/licenses/agpl-3.0.en.html
** 
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** 
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*/

package com.goldencode.p2j.util;

/**
 * Simple association between an <code>LazyUndoable</code> and a copy of that 
 * <code>LazyUndoable</code>.
 */
class UndoablePair
{
   /** The variable that is the original undoable. */
   LazyUndoable src = null;
   
   /** The backup copy. */
   LazyUndoable copy = null;
   
   /**
    * Constructor.
    *
    * @param    src
    *           The variable that is the original undoable.
    * @param    copy
    *           The backup copy.
    */
   UndoablePair(LazyUndoable src, LazyUndoable copy)
   {
      this.src  = src;
      this.copy = copy;
   }
}