| static private IsTextLikeNode ( XmlNode n ) : bool | ||
| n | XmlNode | |
| return | bool | |
private static string GetInitialTextFromNodes(ref XmlNode n)
{
string value = null;
if (n != null)
{
// don't consider whitespace
while (n.NodeType == XmlNodeType.Whitespace)
{
n = n.NextSibling;
if (n == null)
{
return(String.Empty);
}
}
if (XmlDataDocument.IsTextLikeNode(n) && (n.NextSibling == null || !XmlDataDocument.IsTextLikeNode(n.NextSibling)))
{
// don't use string builder if only one text node exists
value = n.Value;
n = n.NextSibling;
}
else
{
StringBuilder sb = new StringBuilder();
while (n != null && XmlDataDocument.IsTextLikeNode(n))
{
// Ignore non-significant whitespace nodes
if (n.NodeType != XmlNodeType.Whitespace)
{
sb.Append(n.Value);
}
n = n.NextSibling;
}
value = sb.ToString();
}
}
if (value == null)
{
value = String.Empty;
}
return(value);
}
// Get the initial text value for the current node. You should be positioned on the node (element) for
// which to get the initial text value, not on the text node.
internal bool NextInitialTextLikeNodes(out string value)
{
Debug.Assert(CurrentNode != null);
Debug.Assert(CurrentNode.NodeType == XmlNodeType.Element);
#if DEBUG
// It's not OK to try to read the initial text value for sub-regions, because we do not know how to revert their initial state
if (CurrentNode.NodeType == XmlNodeType.Element && mapper.GetTableSchemaForElement((XmlElement)(CurrentNode)) != null)
{
if (CurrentNode != _rowElement)
{
Debug.Fail("Reading the initial text value for sub-regions.");
}
}
#endif
ElementState oldState = _rowElement.ElementState;
// We do not want to cause any foliation w/ this iterator or use this iterator once the region was defoliated
Debug.Assert(oldState != ElementState.None);
XmlNode n = CurrentNode.FirstChild;
value = GetInitialTextFromNodes(ref n);
if (n == null)
{
// If we have been defoliated, we should have stayed that way
Debug.Assert((oldState == ElementState.Defoliated) ? (_rowElement.ElementState == ElementState.Defoliated) : true);
// Rollback eventual foliation
_rowElement.ElementState = oldState;
return(NextRight());
}
Debug.Assert(!XmlDataDocument.IsTextLikeNode(n));
_currentNode = n;
// If we have been defoliated, we should have stayed that way
Debug.Assert((oldState == ElementState.Defoliated) ? (_rowElement.ElementState == ElementState.Defoliated) : true);
// Rollback eventual foliation
_rowElement.ElementState = oldState;
return(true);
}
private static string GetInitialTextFromNodes(ref XmlNode n)
{
string str = null;
if (n != null)
{
while (n.NodeType == XmlNodeType.Whitespace)
{
n = n.NextSibling;
if (n == null)
{
return(string.Empty);
}
}
if (XmlDataDocument.IsTextLikeNode(n) && ((n.NextSibling == null) || !XmlDataDocument.IsTextLikeNode(n.NextSibling)))
{
str = n.Value;
n = n.NextSibling;
}
else
{
StringBuilder builder = new StringBuilder();
while ((n != null) && XmlDataDocument.IsTextLikeNode(n))
{
if (n.NodeType != XmlNodeType.Whitespace)
{
builder.Append(n.Value);
}
n = n.NextSibling;
}
str = builder.ToString();
}
}
if (str == null)
{
str = string.Empty;
}
return(str);
}
