/// <summary>
/// Writes the specified start tag and associates it with the given namespace and prefix.
/// Inherited from <c>XmlTextWriter</c>, see <see cref="XmlTextWriter.WriteStartElement"/>
/// Overridden to detect <c>exsl:document</c> element start tag.
/// </summary>
/// <param name="prefix">The namespace prefix of the element.</param>
/// <param name="localName">The local name of the element.</param>
/// <param name="ns">The namespace URI to associate with the element. If this namespace
/// is already in scope and has an associated prefix then the writer will automatically write that prefix also. </param>
/// <exception cref="InvalidOperationException">The writer is closed.</exception>
public override void WriteStartElement(string prefix, string localName, string ns)
{
CheckContentStart();
//Is it exsl:document redirecting instruction?
if (ns == RedirectNamespace && localName == RedirectElementName)
{
//Lazy stack of states
if (states == null)
{
states = new Stack();
}
//If we are redirecting already - push the current state into the stack
if (redirectState == RedirectState.Redirecting)
{
states.Push(state);
}
//Initialize new state
state = new OutputState();
redirectState = RedirectState.WritingRedirectElementAttrs;
}
else
{
if (redirectState == RedirectState.Redirecting)
{
if (state.Method == OutputMethod.Text)
{
state.Depth++;
return;
}
//Write doctype before the first element
if (state.Depth == 0 && state.SystemDoctype != null)
{
if (prefix != String.Empty)
{
state.XmlWriter.WriteDocType(prefix + ":" + localName,
state.PublicDoctype, state.SystemDoctype, null);
}
else
{
state.XmlWriter.WriteDocType(localName,
state.PublicDoctype, state.SystemDoctype, null);
}
}
state.XmlWriter.WriteStartElement(prefix, localName, ns);
state.Depth++;
}
else
{
base.WriteStartElement(prefix, localName, ns);
}
}
}
/// <summary>
/// Finishes output redirecting - closes current writer
/// and pops previous state.
/// </summary>
internal void FinishRedirecting()
{
state.CloseWriter();
//Pop previous state if it exists
if (states.Count != 0)
{
state = (OutputState)states.Pop();
redirectState = RedirectState.Redirecting;
}
else
{
state = null;
redirectState = RedirectState.Relaying;
}
}