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/*****************************************************************************
*
* Copyright (c) 2000 - 2017, Lawrence Livermore National Security, LLC
* Produced at the Lawrence Livermore National Laboratory
* LLNL-CODE-442911
* All rights reserved.
*
* This file is part of VisIt. For details, see https://visit.llnl.gov/. The
* full copyright notice is contained in the file COPYRIGHT located at the root
* of the VisIt distribution or at http://www.llnl.gov/visit/copyright.html.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the disclaimer below.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the disclaimer (as noted below) in the
* documentation and/or other materials provided with the distribution.
* - Neither the name of the LLNS/LLNL nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL LAWRENCE LIVERMORE NATIONAL SECURITY,
* LLC, THE U.S. DEPARTMENT OF ENERGY OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
*****************************************************************************/
#ifndef SIMPLEOBSERVER_H
#define SIMPLEOBSERVER_H
#include <state_exports.h>
class Subject;
// *******************************************************************
// Class: SimpleObserver
//
// Purpose:
// Defines an interface for the observer in the observer design
// pattern. See Design Patterns p.293
//
// Notes: This is an abstract base class. Note that the subject
// that actually changed is passed to the Update method. This is so
// we can support having observers that watch more than one subject.
//
// Programmer: Brad Whitlock
// Creation: Thu Jun 1 11:28:42 PDT 2000
//
// Modifications:
// Brad Whitlock, Thu Aug 31 15:18:18 PST 2000
// Added SubjectRemoved.
//
// *******************************************************************
class STATE_API SimpleObserver
{
public:
SimpleObserver();
virtual ~SimpleObserver();
virtual void Update(Subject *TheChangedSubject) = 0;
virtual void SubjectRemoved(Subject *TheRemovedSubject);
void SetUpdate(bool);
bool GetUpdate();
private:
bool doUpdate;
};
#endif
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