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 "core/dom/IdTargetObserverRegistry.h"
28
29#include "core/dom/IdTargetObserver.h"
30
31namespace blink {
32
33PassOwnPtrWillBeRawPtr<IdTargetObserverRegistry> IdTargetObserverRegistry::create()
34{
35    return adoptPtrWillBeNoop(new IdTargetObserverRegistry());
36}
37
38void IdTargetObserverRegistry::trace(Visitor* visitor)
39{
40#if ENABLE(OILPAN)
41    visitor->trace(m_registry);
42    visitor->trace(m_notifyingObserversInSet);
43#endif
44}
45
46void IdTargetObserverRegistry::addObserver(const AtomicString& id, IdTargetObserver* observer)
47{
48    if (id.isEmpty())
49        return;
50
51    IdToObserverSetMap::AddResult result = m_registry.add(id.impl(), nullptr);
52    if (result.isNewEntry)
53        result.storedValue->value = adoptPtrWillBeNoop(new ObserverSet());
54
55    result.storedValue->value->add(observer);
56}
57
58void IdTargetObserverRegistry::removeObserver(const AtomicString& id, IdTargetObserver* observer)
59{
60    if (id.isEmpty() || m_registry.isEmpty())
61        return;
62
63    IdToObserverSetMap::iterator iter = m_registry.find(id.impl());
64
65    ObserverSet* set = iter->value.get();
66    set->remove(observer);
67    if (set->isEmpty() && set != m_notifyingObserversInSet)
68        m_registry.remove(iter);
69}
70
71void IdTargetObserverRegistry::notifyObserversInternal(const AtomicString& id)
72{
73    ASSERT(!id.isEmpty());
74    ASSERT(!m_registry.isEmpty());
75
76    m_notifyingObserversInSet = m_registry.get(id.impl());
77    if (!m_notifyingObserversInSet)
78        return;
79
80    WillBeHeapVector<RawPtrWillBeMember<IdTargetObserver> > copy;
81    copyToVector(*m_notifyingObserversInSet, copy);
82    for (WillBeHeapVector<RawPtrWillBeMember<IdTargetObserver> >::const_iterator it = copy.begin(); it != copy.end(); ++it) {
83        if (m_notifyingObserversInSet->contains(*it))
84            (*it)->idTargetChanged();
85    }
86
87    if (m_notifyingObserversInSet->isEmpty())
88        m_registry.remove(id.impl());
89
90    m_notifyingObserversInSet = nullptr;
91}
92
93bool IdTargetObserverRegistry::hasObservers(const AtomicString& id) const
94{
95    if (id.isEmpty() || m_registry.isEmpty())
96        return false;
97    ObserverSet* set = m_registry.get(id.impl());
98    return set && !set->isEmpty();
99}
100
101} // namespace blink
102