--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/dom/Attribute.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,89 @@
+/*
+ * 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