/*

 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)

 *           (C) 1999 Antti Koivisto (koivisto@kde.org)

 *           (C) 2001 Peter Kelly (pmk@post.com)

 *           (C) 2001 Dirk Mueller (mueller@kde.org)

 * Copyright (C) 2004, 2005, 2006, 2007 Apple 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.

 */

#include "config.h"

#include "Attribute.h"

#include "Attr.h"

#include "Element.h"

#include <wtf/HashMap.h>

#include <wtf/UnusedParam.h>

namespace WebCore {

typedef HashMap<Attribute*, Attr*> AttributeAttrMap;

static AttributeAttrMap& attributeAttrMap()

{

    DEFINE_STATIC_LOCAL(AttributeAttrMap, map, ());

    return map;

}

PassRefPtr<Attribute> Attribute::clone() const

{

    return adoptRef(new Attribute(m_name, m_value, m_isMappedAttribute, m_styleDecl.get()));

}

Attr* Attribute::attr() const

{

    if (m_hasAttr) {

        ASSERT(attributeAttrMap().contains(const_cast<Attribute*>(this)));

        return attributeAttrMap().get(const_cast<Attribute*>(this));

    }

    ASSERT(!attributeAttrMap().contains(const_cast<Attribute*>(this)));

    return 0;

}

PassRefPtr<Attr> Attribute::createAttrIfNeeded(Element* e)

{

    RefPtr<Attr> r;

    if (m_hasAttr) {

        ASSERT(attributeAttrMap().contains(this));

        r = attributeAttrMap().get(this);

    } else {

        ASSERT(!attributeAttrMap().contains(this));

        r = Attr::create(e, e->document(), this); // This will end up calling Attribute::bindAttr.

        ASSERT(attributeAttrMap().contains(this));

    }

    return r.release();

}

void Attribute::bindAttr(Attr* attr)

{

    ASSERT(!m_hasAttr);

    ASSERT(!attributeAttrMap().contains(this));

    attributeAttrMap().set(this, attr);

    m_hasAttr = true;

}

void Attribute::unbindAttr(Attr* attr)

{

    ASSERT(m_hasAttr);

    ASSERT(attributeAttrMap().contains(this));

    ASSERT_UNUSED(attr, attributeAttrMap().get(this) == attr);

    attributeAttrMap().remove(this);

    m_hasAttr = false;

}

} // namespace WebCore