/// <summary>
/// Ensure that "dataSource" is cached as an XPathDocument and return a navigator over the document.
/// </summary>
private XPathNavigator ConstructDocument(object dataSource, string uriRelative, Uri uriResolved)
{
Debug.Assert(dataSource != null, "GetType() below assumes dataSource is not null");
Stream stream = dataSource as Stream;
if (stream != null)
{
// Create document from stream
XmlReader reader = _readerSettings.CreateReader(stream, uriResolved != null ? uriResolved.ToString() : null);
try
{
// Create WhitespaceRuleReader if whitespace should be stripped
return(new XPathDocument(WhitespaceRuleReader.CreateReader(reader, _wsRules), XmlSpace.Preserve).CreateNavigator());
}
finally
{
// Always close reader that was opened here
reader.Close();
}
}
else if (dataSource is XmlReader)
{
// Create document from reader
// Create WhitespaceRuleReader if whitespace should be stripped
return(new XPathDocument(WhitespaceRuleReader.CreateReader(dataSource as XmlReader, _wsRules), XmlSpace.Preserve).CreateNavigator());
}
else if (dataSource is IXPathNavigable)
{
if (_wsRules != null)
{
throw new XslTransformException(SR.XmlIl_CantStripNav, string.Empty);
}
return((dataSource as IXPathNavigable).CreateNavigator());
}
Debug.Assert(uriRelative != null, "Relative URI should not be null");
throw new XslTransformException(SR.XmlIl_CantResolveEntity, uriRelative, dataSource.GetType().ToString());
}
