Observable.cpp

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#include "Observable.h"
#include "Event.h"
#include "Observer.h"
 
Observable::Observable()
{
    m_observerList.clear();
}
 
Observable::~Observable()
{
    // we send an event to observers attached in order to react to observable destruction
    Event l_event(this, Event::DESTROYED);
    notify(l_event);
 
    // we remove
    for (std::list<Observer*>::iterator l_it = m_observerList.begin(); l_it != m_observerList.end();)
    {
        (*l_it)->removeObservable(this);
        l_it = m_observerList.erase(l_it);
    }
}
 
void Observable::attach(Observer* observer)
{
    if (observerAttached(observer) == m_observerList.end())
    {
        m_observerList.push_back(observer);
        observer->addObservable(this);
    }
}
 
void Observable::detach(Observer* observer)
{
    const std::list<Observer*>::iterator l_it = observerAttached(observer);
 
    if (l_it != m_observerList.end())
    {
        m_observerList.erase(l_it);
        observer->removeObservable(this);
    }
}
 
void Observable::notify(Event& event)
{
    for (std::list<Observer*>::iterator l_it = m_observerList.begin(); l_it != m_observerList.end(); ++l_it)
    {
        (*l_it)->treatEvent(&event);
    }
}
 
std::list<Observer*>::iterator Observable::observerAttached(Observer* observer)
{
    std::list<Observer*>::iterator l_result = m_observerList.end();
    if (observer != nullptr)
    {
        for (std::list<Observer*>::iterator l_it = m_observerList.begin(); l_it != m_observerList.end(); ++l_it)
        {
            if ((*l_it) == observer)
            {
                l_result = l_it;
                break;
            }
        }
    }
    return l_result;
}