/* ====================================================================
 * The Vovida Software License, Version 1.0 
 * 
 * Copyright (c) 2000 Vovida Networks, Inc.  All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 
 * 3. The names "VOCAL", "Vovida Open Communication Application Library",
 *    and "Vovida Open Communication Application Library (VOCAL)" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact vocal@vovida.org.
 *
 * 4. Products derived from this software may not be called "VOCAL", nor
 *    may "VOCAL" appear in their name, without prior written
 *    permission of Vovida Networks, Inc.
 * 
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
 * NON-INFRINGEMENT ARE DISCLAIMED.  IN NO EVENT SHALL VOVIDA
 * NETWORKS, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT DAMAGES
 * IN EXCESS OF $1,000, NOR FOR ANY 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.
 * 
 * ====================================================================
 * 
 * This software consists of voluntary contributions made by Vovida
 * Networks, Inc. and many individuals on behalf of Vovida Networks,
 * Inc.  For more information on Vovida Networks, Inc., please see
 * <http://www.vovida.org/>.
 *
 */


static const char* const Subject_cxx_Version = 
    "$Id: Subject.cxx,v 1.3 2001/10/26 21:47:55 icahoon Exp $";


#include "global.h"
#include "Subject.hxx"
#include "Observer.hxx"


using namespace Vocal;
using Behavioral::Subject;
using Behavioral::Observer;


Subject::Subject()
{
}


Subject::~Subject()
{
}


void	    	    
Subject::attach(Observer & src)
{
    // Push it on the back of the list. The user can enter the same
    // observer more than once if they wish.
    //
    myObservers.push_back(&src);
}


void	    	    
Subject::detach(Observer & src)
{
    // Remove the first observer. If not found, do nothing.
    //
    for (   vector<Observer *>::iterator it = myObservers.begin();
    	    it != myObservers.end();
	    it++
	)
    {
    	if ( *(*it) == src )
	{
	    myObservers.erase(it);
	    break;
	}
    }
}


void	    	    
Subject::notify()
{
    for (   vector<Observer *>::iterator it = myObservers.begin();
    	    it != myObservers.end();
	    it++
	)
    {
    	(*it)->update(*this);
    }
}


bool	    	    
Subject::operator==(const Subject & src) const
{
    return ( this == &src );
}


ostream &           
Subject::writeTo(ostream & out) const
{
    out << "observers (size: " << myObservers.size() << ") = { ";
    
    bool first = true;
    
    for (   vector<Observer *>::const_iterator it = myObservers.begin();
    	    it != myObservers.end();
	    it++
	)
    {
    	if ( first )
	{
	    first = false;
	}
	else
	{
	    out << ", ";
	}
	out << *(*it);
    }

    out << " }";
    
    return ( out );
}