/*
 * 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.
 */

#ifndef IdTargetObserver_h
#define IdTargetObserver_h

#include "platform/heap/Handle.h"
#include "wtf/text/AtomicString.h"

namespace blink {

class IdTargetObserverRegistry;

class IdTargetObserver : public NoBaseWillBeGarbageCollectedFinalized<IdTargetObserver> {
public:
    virtual ~IdTargetObserver();
    DECLARE_VIRTUAL_TRACE();
    virtual void idTargetChanged() = 0;
    virtual void unregister();

protected:
    IdTargetObserver(IdTargetObserverRegistry&, const AtomicString& id);

private:
    IdTargetObserverRegistry& registry() { return *m_registry; }

    RawPtrWillBeMember<IdTargetObserverRegistry> m_registry;
    AtomicString m_id;
};

} // namespace blink

#endif // IdTargetObserver_h