dom_attr.h

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/*
**  ClanLib SDK
**  Copyright (c) 1997-2005 The ClanLib Team
**
**  This software is provided 'as-is', without any express or implied
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**  arising from the use of this software.
**
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**  including commercial applications, and to alter it and redistribute it
**  freely, subject to the following restrictions:
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**     claim that you wrote the original software. If you use this software
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**     appreciated but is not required.
**  2. Altered source versions must be plainly marked as such, and must not be
**     misrepresented as being the original software.
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**  Note: Some of the libraries ClanLib link to may have additional
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**
**  File Author(s):
**
**    Magnus Norddahl
*/


#ifndef header_dom_attr
#define header_dom_attr

#if _MSC_VER > 1000
#pragma once
#endif

#include "dom_node.h"

//: DOM Attribute class.
//- !group=Core/XML!
//- !header=core.h!
//- <p>The Attr interface represents an attribute in an Element object. Typically
//- the allowable values for the attribute are defined in a document type definition.</p>
//- <p>Attr objects inherit the Node interface, but since they are not actually child
//- nodes of the element they describe, the DOM does not consider them part of the
//- document tree. Thus, the Node attributes parentNode, previousSibling, and nextSibling
//- have a null value for Attr objects. The DOM takes the view that attributes are
//- properties of elements rather than having a separate identity from the elements
//- they are associated with; this should make it more efficient to implement such
//- features as default attributes associated with all elements of a given type. Furthermore,
//- Attr nodes may not be immediate children of a DocumentFragment. However, they can
//- be associated with Element nodes contained within a DocumentFragment. In short,
//- users and implementors of the DOM need to be aware that Attr nodes have some
//- things in common with other objects inheriting the Node interface, but they also
//- are quite distinct.</p>
//- <p>The attribute's effective value is determined as follows: if this attribute
//- has been explicitly assigned any value, that value is the attribute's effective
//- value; otherwise, if there is a declaration for this attribute, and that declaration
//- includes a default value, then that default value is the attribute's effective value;
//- otherwise, the attribute does not exist on this element in the structure model until
//- it has been explicitly added. Note that the nodeValue attribute on the Attr instance
//- can also be used to retrieve the string version of the attribute's value(s).</p>
//- <p>In XML, where the value of an attribute can contain entity references, the child
//- nodes of the Attr node provide a representation in which entity references are not
//- expanded. These child nodes may be either Text or EntityReference nodes. Because the
//- attribute type may be unknown, there are no tokenized attribute values.</p>
class CL_DomAttr : public CL_DomNode
{
public:
        //: Constructs a DOM Attr handle.
        CL_DomAttr();
        
        CL_DomAttr(CL_DomDocument doc, const std::string &name);

        CL_DomAttr(const CL_SharedPtr<CL_DomNode_Generic> &impl);
        
        ~CL_DomAttr();

public:
        //: Returns the name of this attribute.
        std::string get_name() const;

        //: If this attribute was explicitly given a value in the original document, this is true; otherwise, it is false.
        //- <ul>
        //- <li>If the attribute has an assigned value in the document then specified is true,
        //- and the value is the assigned value.</li>
        //- <li>If the attribute has no assigned value in the document and has a default value
        //- in the DTD, then specified is false, and the value is the default value in the DTD.</li>
        //- <li>If the attribute has no assigned value in the document and has a value of #IMPLIED
        //- in the DTD, then the attribute does not appear in the structure model of the document.</li>
        //- </ul>
        bool get_specified() const;
        
        //: Returns the value of the attribute.
        std::string get_value() const;

        //: Sets the value of the attribute.
        void set_value(const std::string &value);

public:

private:
        friend class CL_DomElement;
};

#endif

---