/*
 * 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/style/ComputedStyleConstants.h"
#include "platform/LinkHash.h"
#include "wtf/HashSet.h"

namespace blink {

class Document;

class VisitedLinkState : public GarbageCollectedFinalized<VisitedLinkState> {
 public:
  static VisitedLinkState* create(const Document& document) {
    return new VisitedLinkState(document);
  }

  void invalidateStyleForAllLinks(bool invalidateVisitedLinkHashes);
  void invalidateStyleForLink(LinkHash);

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

  DECLARE_TRACE();

 private:
  explicit VisitedLinkState(const Document&);
  const Document& document() const { return *m_document; }

  EInsideLink determineLinkStateSlowCase(const Element&);

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

}  // namespace blink

#endif