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/*****************************************************************************
*
* Copyright (c) 2000 - 2010, Lawrence Livermore National Security, LLC
* Produced at the Lawrence Livermore National Laboratory
* LLNL-CODE-400124
* 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.
*
*****************************************************************************/
#include <Observer.h>
#include <Subject.h>
// *******************************************************************
// Method: Observer::Observer
//
// Purpose:
// Constructor for the Observer class. It registers the observer
// with the subject that is passed in.
//
// Arguments:
// s : This is a pointer to a valid subject that we want to observe.
//
// Programmer: Brad Whitlock
// Creation: Tue Jun 6 10:43:37 PDT 2000
//
// Modifications:
//
// *******************************************************************
Observer::Observer(Subject *s) : SimpleObserver()
{
subject = s;
subject->Attach(this);
}
// *******************************************************************
// Method: Observer::~Observer
//
// Purpose:
// Destructor for the Observer class. Detaches this observer from
// the subject that it is watching.
//
// Programmer: Brad Whitlock
// Creation: Tue Jun 6 10:44:47 PDT 2000
//
// Modifications:
// Brad Whitlock, Thu Aug 31 15:05:59 PST 2000
// I changed the code so it does not try to detach from the subject.
// The subject told the observer that it was destroyed.
//
// *******************************************************************
Observer::~Observer()
{
if(subject != 0)
{
subject->Detach(this);
subject = 0;
}
}
// *******************************************************************
// Method: Observer::SubjectRemoved
//
// Purpose:
// Indicates that the subject that the Observer was watching is
// not around anymore.
//
// Programmer: Brad Whitlock
// Creation: Thu Aug 31 15:20:45 PST 2000
//
// Modifications:
//
// *******************************************************************
void
Observer::SubjectRemoved(Subject *)
{
subject = 0;
}
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