com.exigen.ie.constrainer.UndoableAction Maven / Gradle / Ivy

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package com.exigen.ie.constrainer;

///////////////////////////////////////////////////////////////////////////////
/*
 * Copyright Exigen Group 1998, 1999, 2000
 * 320 Amboy Ave., Metuchen, NJ, 08840, USA, www.exigengroup.com
 *
 * The copyright to the computer program(s) herein
 * is the property of Exigen Group, USA. All rights reserved.
 * The program(s) may be used and/or copied only with
 * the written permission of Exigen Group
 * or in accordance with the terms and conditions
 * stipulated in the agreement/contract under which
 * the program(s) have been supplied.
 */
///////////////////////////////////////////////////////////////////////////////

import com.exigen.ie.tools.Log;
import com.exigen.ie.tools.Reusable;
import com.exigen.ie.tools.ReusableFactory;

/**
 * An implementation of the undoable action for the goal.
 *
 * UndoImpl._undoable is not used: need to use another "UndoImpl".
 */
class UndoableAction extends UndoImpl
{
  private Goal _goal;

  static UndoableAction getUndo(Goal goal)
  {
    UndoableAction u = (UndoableAction) _factory.getElement();
    u._goal = goal;
    return u;
  }

  static ReusableFactory _factory = new ReusableFactory()
  {
      protected Reusable createNewElement()
      {
        return new UndoableAction();
      }
  };

  public void undo()
  {
    try
    {
      _goal.execute();
    }
    catch(Failure e)
    {
      Log.error("Unexpected exception executing undoable action: ",e);
    }
    super.undo();
  }

  /**
   * Returns a String representation of this object.
   * @return a String representation of this object.
   */
  public String toString()
  {
    return "undoable action: " + _goal;
  }

} // ~UndoableAction