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/// -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: t -*-

///

/// \file observer.cpp

/// \author Martin Reddy

/// \brief Abstract base classes to implement Observer.

///

/// Copyright (c) 2010, Martin Reddy. All rights reserved.

/// Distributed under the X11/MIT License. See LICENSE.txt.

/// See http://APIBook.com/ for the latest version.

///

#include "observer.h"

ISubject::ISubject() {}

ISubject::~ISubject() {}

void ISubject::Subscribe(int message, IObserver *observer)

{

if (observer)

{

ObserverMap::iterator it = mObservers.find(message);

if (it == mObservers.end())

{

mObservers[message] = ObserverList();

}

mObservers[message].push_back(observer);

}

}

void ISubject::Unsubscribe(int message, IObserver *observer)

{

ObserverMap::iterator it = mObservers.find(message);

if (it != mObservers.end())

{

ObserverList &list = mObservers[message];

ObserverList::iterator li;

for (li = list.begin(); li != list.end();)

{

if ((*li) == observer)

{

list.erase(li);

}

else

{

++li;

}

}

}

}

void ISubject::Notify(int message)

{

ObserverMap::iterator it = mObservers.find(message);

if (it != mObservers.end())

{

ObserverList &list = mObservers[message];

ObserverList::iterator li;

for (li = list.begin(); li != list.end(); ++li)

{

(*li)->Update(message);

}

}

}