WebCore/dom/Attribute.h

   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
  30 namespace WebCore {
  31
  32 class Attr;
  33 class CSSStyleDeclaration;
  34 class Element;
  35 class 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.
  40 class Attribute : public RefCounted<Attribute> {
  41     friend class Attr;
  42     friend class NamedNodeMap;
  43 public:
  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
  73 protected:
  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
  83 private:
  84     QualifiedName m_name;
  85     AtomicString m_value;
  86     Attr* m_impl;
  87 };
  88
  89 } //namespace
  90
  91 #endif