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/*
* Copyright (C) 2012 Google Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <memory>
#include <wtf/CheckedPtr.h>
#include <wtf/Forward.h>
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/text/AtomString.h>
#include <wtf/text/AtomStringHash.h>
namespace WebCore {
class Element;
class IdTargetObserver;
class IdTargetObserverRegistry final : public CanMakeCheckedPtr<IdTargetObserverRegistry> {
WTF_MAKE_TZONE_ALLOCATED(IdTargetObserverRegistry);
WTF_OVERRIDE_DELETE_FOR_CHECKED_PTR(IdTargetObserverRegistry);
friend class IdTargetObserver;
public:
IdTargetObserverRegistry();
~IdTargetObserverRegistry();
void notifyObservers(Element&, const AtomString& id);
private:
void addObserver(const AtomString& id, IdTargetObserver&);
void removeObserver(const AtomString& id, IdTargetObserver&);
void notifyObserversInternal(Element&, const AtomString& id);
struct ObserverSet final : public CanMakeCheckedPtr<ObserverSet> {
WTF_MAKE_STRUCT_FAST_ALLOCATED;
WTF_STRUCT_OVERRIDE_DELETE_FOR_CHECKED_PTR(ObserverSet);
ObserverSet();
~ObserverSet();
UncheckedKeyHashSet<CheckedRef<IdTargetObserver>> observers;
};
using IdToObserverSetMap = UncheckedKeyHashMap<AtomString, std::unique_ptr<ObserverSet>>;
IdToObserverSetMap m_registry;
CheckedPtr<ObserverSet> m_notifyingObserversInSet;
};
inline void IdTargetObserverRegistry::notifyObservers(Element& element, const AtomString& id)
{
ASSERT(!id.isEmpty());
ASSERT(!m_notifyingObserversInSet);
if (m_registry.isEmpty())
return;
IdTargetObserverRegistry::notifyObserversInternal(element, id);
}
} // namespace WebCore
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