/*
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.xwiki.gwt.wysiwyg.client.plugin.history;
/**
* Interface for undoing and redoing user's edit actions.
*
* @version $Id: c34a85f2eec71a8a2993f687a046be590c07166b $
*/
public interface History
{
/**
* @return false if the current version of the edited content is the latest one.
*/
boolean canRedo();
/**
* @return false if the current version is the first one or if it is the oldest one stored in the history.
*/
boolean canUndo();
/**
* Loads the next newer version of the edited content.
*/
void redo();
/**
* Loads the next older version of the edited content.
*/
void undo();
}