Observer.cpp

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#include "Observer.h"
#include "Event.h"
#include "Observable.h"
 
Observer::Observer()
{
    m_observableList.clear();
}
 
Observer::~Observer()
{
    while (!m_observableList.empty())
    {
        std::list<Observable*>::iterator l_it = m_observableList.begin();
        (*l_it)->detach(this);
    }
}
 
void Observer::treatEvent(Event* event)
{
    if (!event)
        return;
 
    switch (event->type())
    {
    case Event::DESTROYED:
        onDestroyEvent();
        break;
 
    default:
        onEvent(event);
        break;
    }
}
 
void Observer::addObservable(Observable* obs)
{
    const std::list<Observable*>::iterator l_toRemove = findObservable(obs);
    if (l_toRemove == m_observableList.end())
    {
        m_observableList.push_back(obs);
    }
}
 
void Observer::removeObservable(Observable* obs)
{
    m_observableList.erase(findObservable(obs));
}
 
std::list<Observable*>::iterator Observer::findObservable(Observable* obs)
{
    std::list<Observable*>::iterator l_result = m_observableList.end();
 
    if (obs != nullptr)
    {
        for (std::list<Observable*>::iterator l_it = m_observableList.begin(); l_it != m_observableList.end(); ++l_it)
        {
            if (*l_it == obs)
            {
                l_result = l_it;
                break;
            }
        }
    }
 
    return l_result;
}