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 for (auto& observer : copyToVector(*m_notifyingObserversInSet)) {
67 if (m_notifyingObserversInSet->contains(observer))
68 observer->idTargetChanged();
69 }
70
71 if (m_notifyingObserversInSet->isEmpty())
72 m_registry.remove(&id);
73
74 m_notifyingObserversInSet = nullptr;
75}
76
77} // namespace WebCore
78