[mvp-xml-cvs] XPointer/v1/src IDAssuredValidatingReader.cs,NONE,1.1

[Oleg T. <he...@us...>]

Update of /cvsroot/mvp-xml/XPointer/v1/src
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv29783/v1/src

Added Files:
	IDAssuredValidatingReader.cs 
Log Message:
Auxillary XmlReader to support schema-determined IDs.

--- NEW FILE: IDAssuredValidatingReader.cs ---
#region using

using System.Xml;

#endregion

/// <summary>
/// Auxillary XmlReader that always reports dummy DOCTYPE. This is done
/// to turn on support for id() function in XML Schema defined XML documents.
/// See http://www.tkachenko.com/blog/archives/000060.html.
/// </summary>
public class IdAssuredValidatingReader : XmlValidatingReader 
{
    #region private members

    private bool _exposeDummyDoctype;
    private bool _isInProlog = true;    

    #endregion

    #region constructors
       
    public IdAssuredValidatingReader(XmlReader r) : base (r) {}

    #endregion

    #region XmlValidatingReader overrides
    
    public override XmlNodeType NodeType 
    {
        get 
        { 
            return _exposeDummyDoctype ?
                XmlNodeType.DocumentType :
                base.NodeType; 
        }            
    }
    
    public override bool MoveToNextAttribute() 
    {
        return _exposeDummyDoctype?
            false :
            base.MoveToNextAttribute();
    }
    
    public override bool Read() 
    {
        if (_isInProlog) 
        {
            if (!_exposeDummyDoctype) 
            {
                //We are looking for the very first element
                bool baseRead = base.Read();
                if (base.NodeType == XmlNodeType.Element) 
                {
                    _exposeDummyDoctype = true;  
                    return true;
                } 
                else if (base.NodeType == XmlNodeType.DocumentType) 
                {
                    //Document has own DOCTYPE, switch back to normal flow
                    _exposeDummyDoctype = false;
                    _isInProlog = false;
                    return true;
                }
                else 
                {
                    return baseRead;
                }
            } 
            else 
            {
                //Done, switch back to normal flow
                _exposeDummyDoctype = false;
                _isInProlog = false;
                return true;
            }
        } 
        else
            return base.Read();
    }

    #endregion
}