private OpenXmlElement CreateChildElement()
{
Debug.Assert(_elementStack.Count > 0);
Debug.Assert(_xmlReader != null);
OpenXmlElement element = _elementStack.Peek();
// AlternateContent / Choice / Fallback needs special treatment
// The ElementFactory( ) of the Choice / Fallback depends on the parent of AlternateContentChoice
// TODO: find a better solution
if (element is AlternateContentChoice || element is AlternateContentFallback)
{
if (_elementStack.Count > 2)
{
OpenXmlElement topElement = _elementStack.Pop();
OpenXmlElement acElement = _elementStack.Pop();
OpenXmlElement parentsParent = _elementStack.Peek().CloneNode(false);
_elementStack.Push(acElement);
_elementStack.Push(topElement);
element = topElement.CloneNode(false);
acElement = new AlternateContent();
acElement.AppendChild(element);
parentsParent.AppendChild(acElement);
}
}
return(element.ElementFactory(_xmlReader));
}
/// <summary>
/// Trys to create an OpenXmlElement from the specified namesapce URI and local name.
/// </summary>
/// <param name="parent">The parent element.</param>
/// <param name="fileFormat">The specified file format version.</param>
/// <param name="namespaceUri">The namespace URI of the requested child element.</param>
/// <param name="localName">The local name of the requested child element.</param>
/// <returns>A new OpenXmlElement if the parent element can contains a child with the specified namespace and local name. Otherwise, returns null.</returns>
internal static OpenXmlElement TryCreateValidChild(this OpenXmlElement parent, FileFormatVersions fileFormat, string namespaceUri, string localName)
{
Debug.Assert(parent is OpenXmlCompositeElement);
Debug.Assert(localName != null);
var newElement = parent.ElementFactory(string.Empty, localName, namespaceUri);
if (newElement is OpenXmlUnknownElement || !newElement.IsInVersion(fileFormat))
{
return(null);
}
return(newElement);
}
internal override OpenXmlElement ElementFactory(byte namespaceId, string name)
{
OpenXmlElement newElement = null;
if (Parent != null &&
Parent is AlternateContent)
{
OpenXmlElement parentsParentElemnt = Parent.Parent;
if (parentsParentElemnt != null)
{
newElement = parentsParentElemnt.ElementFactory(namespaceId, name);
}
}
return(newElement);
}
