FeedObserver/subject.cpp at master · fernandotelles/FeedObserver · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
#include "subject.h"

#include <QList>
#include <QMultiHash>
#include <QString>
#include <QDebug>

#include "iobserver.h"

Subject::Subject() :
    m_observers(new QList<IObserver *>),
    m_feedCategories(new QMultiHash<QString, IObserver *>)
{

}

Subject::~Subject()
{
    delete m_observers;
    delete m_feedCategories;
}

void Subject::attach(IObserver *observer, QString feedName)
{
    if(!feedName.isEmpty())
        m_feedCategories->insert(feedName, observer);
    else
        m_observers->append(observer);

}

void Subject::detach(IObserver *observer, QString feedName)
{
    if(m_feedCategories->contains(feedName, observer))
        m_feedCategories->remove(feedName, observer);
    else
        m_observers->removeOne(observer);

}

void Subject::notify(QString feedName)
{
    if(!feedName.isEmpty())
    {
        QMultiHash<QString, IObserver *>::iterator i = m_feedCategories->find(feedName);
        while (i != m_feedCategories->end() && i.key() == feedName)
        {
            i.value()->update(this, feedName);
            ++i;
        }

        foreach(IObserver *observer, *m_observers)
            observer->update(this, feedName);
    }
    else
    {
        foreach(IObserver *observer, *m_observers)
            observer->update(this, feedName);
    }
}