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) 2004, 2005, 2006, 2007 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#include "config.h"
25#include "Attribute.h"
26
27#include "Attr.h"
28#include "Element.h"
29#include <wtf/HashMap.h>
30#include <wtf/UnusedParam.h>
31
32namespace WebCore {
33
34typedef HashMap<Attribute*, Attr*> AttributeAttrMap;
35static AttributeAttrMap& attributeAttrMap()
36{
37    DEFINE_STATIC_LOCAL(AttributeAttrMap, map, ());
38    return map;
39}
40
41PassRefPtr<Attribute> Attribute::clone() const
42{
43    return adoptRef(new Attribute(m_name, m_value, m_isMappedAttribute, m_styleDecl.get()));
44}
45
46Attr* Attribute::attr() const
47{
48    if (m_hasAttr) {
49        ASSERT(attributeAttrMap().contains(const_cast<Attribute*>(this)));
50        return attributeAttrMap().get(const_cast<Attribute*>(this));
51    }
52
53    ASSERT(!attributeAttrMap().contains(const_cast<Attribute*>(this)));
54    return 0;
55}
56
57PassRefPtr<Attr> Attribute::createAttrIfNeeded(Element* e)
58{
59    RefPtr<Attr> r;
60    if (m_hasAttr) {
61        ASSERT(attributeAttrMap().contains(this));
62        r = attributeAttrMap().get(this);
63    } else {
64        ASSERT(!attributeAttrMap().contains(this));
65        r = Attr::create(e, e->document(), this); // This will end up calling Attribute::bindAttr.
66        ASSERT(attributeAttrMap().contains(this));
67    }
68
69    return r.release();
70}
71
72void Attribute::bindAttr(Attr* attr)
73{
74    ASSERT(!m_hasAttr);
75    ASSERT(!attributeAttrMap().contains(this));
76    attributeAttrMap().set(this, attr);
77    m_hasAttr = true;
78}
79
80void Attribute::unbindAttr(Attr* attr)
81{
82    ASSERT(m_hasAttr);
83    ASSERT(attributeAttrMap().contains(this));
84    ASSERT_UNUSED(attr, attributeAttrMap().get(this) == attr);
85    attributeAttrMap().remove(this);
86    m_hasAttr = false;
87}
88
89} // namespace WebCore
90