Source/core/dom/VisitedLinkState.h

/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
 * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
 * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
 * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
 * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
 * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
 * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
 * Copyright (C) Research In Motion Limited 2011. All rights reserved.
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#ifndef VisitedLinkState_h
#define VisitedLinkState_h

#include "core/dom/Element.h"
#include "core/rendering/style/RenderStyleConstants.h"
#include "platform/LinkHash.h"
#include "wtf/HashSet.h"

namespace WebCore {

class Document;

class VisitedLinkState {
    WTF_MAKE_FAST_ALLOCATED;
public:
    static PassOwnPtr<VisitedLinkState> create(const Document& document)
    {
        return adoptPtr(new VisitedLinkState(document));
    }

    void invalidateStyleForAllLinks();
    void invalidateStyleForLink(LinkHash);

    EInsideLink determineLinkState(const Element& element)
    {
        if (element.isLink())
            return determineLinkStateSlowCase(element);
        return NotInsideLink;
    }

private:
    explicit VisitedLinkState(const Document&);

    EInsideLink determineLinkStateSlowCase(const Element&);

    const Document& m_document;
    HashSet<LinkHash, LinkHashHash> m_linksCheckedForVisitedState;
};

}

#endif