1/*
2 * Copyright (C) 2012 Google Inc. All Rights Reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "IdTargetObserverRegistry.h"
28
29#include "IdTargetObserver.h"
30
31namespace WebCore {
32
33void IdTargetObserverRegistry::addObserver(const AtomicString& id, IdTargetObserver* observer)
34{
35    if (id.isEmpty())
36        return;
37
38    IdToObserverSetMap::AddResult result = m_registry.add(id.impl(), nullptr);
39    if (result.isNewEntry)
40        result.iterator->value = std::make_unique<ObserverSet>();
41
42    result.iterator->value->add(observer);
43}
44
45void IdTargetObserverRegistry::removeObserver(const AtomicString& id, IdTargetObserver* observer)
46{
47    if (id.isEmpty() || m_registry.isEmpty())
48        return;
49
50    IdToObserverSetMap::iterator iter = m_registry.find(id.impl());
51
52    ObserverSet* set = iter->value.get();
53    set->remove(observer);
54    if (set->isEmpty() && set != m_notifyingObserversInSet)
55        m_registry.remove(iter);
56}
57
58void IdTargetObserverRegistry::notifyObserversInternal(const AtomicStringImpl& id)
59{
60    ASSERT(!m_registry.isEmpty());
61
62    m_notifyingObserversInSet = m_registry.get(&id);
63    if (!m_notifyingObserversInSet)
64        return;
65
66    Vector<IdTargetObserver*> copy;
67    copyToVector(*m_notifyingObserversInSet, copy);
68    for (Vector<IdTargetObserver*>::const_iterator it = copy.begin(); it != copy.end(); ++it) {
69        if (m_notifyingObserversInSet->contains(*it))
70            (*it)->idTargetChanged();
71    }
72
73    if (m_notifyingObserversInSet->isEmpty())
74        m_registry.remove(&id);
75
76    m_notifyingObserversInSet = 0;
77}
78
79} // namespace WebCore
80