/*

 * This file is part of the DOM implementation for KDE.

 *

 * 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) 2003, 2004, 2005, 2006 Apple Computer, Inc.

 *

 * 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 Attribute_h

#define Attribute_h

#include "QualifiedName.h"

namespace WebCore {

class Attr;

class CSSStyleDeclaration;

class Element;

class NamedAttrMap;

// this has no counterpart in DOM, purely internal

// representation of the nodevalue of an Attr.

// the actual Attr (Attr) with its value as textchild

// is only allocated on demand by the DOM bindings.

// Any use of Attr inside khtml should be avoided.

class Attribute : public Shared<Attribute> {

    friend class Attr;

    friend class Element;

    friend class NamedAttrMap;

public:

    // null value is forbidden !

    Attribute(const QualifiedName& name, const AtomicString& value)

        : m_name(name), m_value(value), m_impl(0)

    {}

    Attribute(const AtomicString& name, const AtomicString& value)

        : m_name(nullAtom, name, nullAtom), m_value(value), m_impl(0)

    {}

    virtual ~Attribute() { }

    const AtomicString& value() const { return m_value; }

    const AtomicString& prefix() const { return m_name.prefix(); }

    const AtomicString& localName() const { return m_name.localName(); }

    const AtomicString& namespaceURI() const { return m_name.namespaceURI(); }

    const QualifiedName& name() const { return m_name; }

    Attr* attr() const { return m_impl; }

    PassRefPtr<Attr> createAttrIfNeeded(Element*);

    bool isNull() const { return m_value.isNull(); }

    bool isEmpty() const { return m_value.isEmpty(); }

    virtual Attribute* clone(bool preserveDecl=true) const;

    // An extension to get the style information for presentational attributes.

    virtual CSSStyleDeclaration* style() const { return 0; }

    void setValue(const AtomicString& value) { m_value = value; }

    void setPrefix(const AtomicString& prefix) { m_name.setPrefix(prefix); }

private:

    QualifiedName m_name;

    AtomicString m_value;

    Attr* m_impl;

};

} //namespace

#endif