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
33PassOwnPtr<IdTargetObserverRegistry> IdTargetObserverRegistry::create()
34{
35    return adoptPtr(new IdTargetObserverRegistry());
36}
37
38void IdTargetObserverRegistry::addObserver(const AtomicString& id, IdTargetObserver* observer)
39{
40    if (id.isEmpty())
41        return;
42
43    IdToObserverSetMap::AddResult result = m_registry.add(id.impl(), nullptr);
44    if (result.isNewEntry)
45        result.iterator->value = adoptPtr(new ObserverSet());
46
47    result.iterator->value->add(observer);
48}
49
50void IdTargetObserverRegistry::removeObserver(const AtomicString& id, IdTargetObserver* observer)
51{
52    if (id.isEmpty() || m_registry.isEmpty())
53        return;
54
55    IdToObserverSetMap::iterator iter = m_registry.find(id.impl());
56
57    ObserverSet* set = iter->value.get();
58    set->remove(observer);
59    if (set->isEmpty() && set != m_notifyingObserversInSet)
60        m_registry.remove(iter);
61}
62
63void IdTargetObserverRegistry::notifyObserversInternal(const AtomicString& id)
64{
65    ASSERT(!id.isEmpty());
66    ASSERT(!m_registry.isEmpty());
67
68    m_notifyingObserversInSet = m_registry.get(id.impl());
69    if (!m_notifyingObserversInSet)
70        return;
71
72    Vector<IdTargetObserver*> copy;
73    copyToVector(*m_notifyingObserversInSet, copy);
74    for (Vector<IdTargetObserver*>::const_iterator it = copy.begin(); it != copy.end(); ++it) {
75        if (m_notifyingObserversInSet->contains(*it))
76            (*it)->idTargetChanged();
77    }
78
79    if (m_notifyingObserversInSet->isEmpty())
80        m_registry.remove(id.impl());
81
82    m_notifyingObserversInSet = 0;
83}
84
85} // namespace WebCore
86