1/*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
4 *           (C) 2001 Peter Kelly (pmk@post.com)
5 *           (C) 2001 Dirk Mueller (mueller@kde.org)
6 * Copyright (C) 2003, 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Library General Public License for more details.
17 *
18 * You should have received a copy of the GNU Library General Public License
19 * along with this library; see the file COPYING.LIB.  If not, write to
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
22 *
23 */
24
25#ifndef Attribute_h
26#define Attribute_h
27
28#include "QualifiedName.h"
29
30namespace WebCore {
31
32class Attr;
33class CSSStyleDeclaration;
34class Element;
35class NamedNodeMap;
36
37// This has no counterpart in DOM.
38// It is an internal representation of the node value of an Attr.
39// The actual Attr with its value as a Text child is allocated only if needed.
40class Attribute : public RefCounted<Attribute> {
41    friend class Attr;
42    friend class NamedNodeMap;
43public:
44    static PassRefPtr<Attribute> create(const QualifiedName& name, const AtomicString& value)
45    {
46        return adoptRef(new Attribute(name, value));
47    }
48    virtual ~Attribute() { }
49
50    const AtomicString& value() const { return m_value; }
51    const AtomicString& prefix() const { return m_name.prefix(); }
52    const AtomicString& localName() const { return m_name.localName(); }
53    const AtomicString& namespaceURI() const { return m_name.namespaceURI(); }
54
55    const QualifiedName& name() const { return m_name; }
56
57    Attr* attr() const { return m_impl; }
58    PassRefPtr<Attr> createAttrIfNeeded(Element*);
59
60    bool isNull() const { return m_value.isNull(); }
61    bool isEmpty() const { return m_value.isEmpty(); }
62
63    virtual PassRefPtr<Attribute> clone() const;
64
65    // An extension to get the style information for presentational attributes.
66    virtual CSSStyleDeclaration* style() const { return 0; }
67
68    void setValue(const AtomicString& value) { m_value = value; }
69    void setPrefix(const AtomicString& prefix) { m_name.setPrefix(prefix); }
70
71    virtual bool isMappedAttribute() { return false; }
72
73protected:
74    Attribute(const QualifiedName& name, const AtomicString& value)
75        : m_name(name), m_value(value), m_impl(0)
76    {
77    }
78    Attribute(const AtomicString& name, const AtomicString& value)
79        : m_name(nullAtom, name, nullAtom), m_value(value), m_impl(0)
80    {
81    }
82
83private:
84    QualifiedName m_name;
85    AtomicString m_value;
86    Attr* m_impl;
87};
88
89} //namespace
90
91#endif
92