/// <summary>
/// Takes a data value from the _queryResults datatable and returns a marshalled data object.
/// </summary>
/// <param name="cellValue">A cell value from a Virtuoso results datatable.</param>
/// <returns>A reference to the marshalled data object.</returns>
private object ParseCellValue(object cellValue)
{
if (cellValue is SqlExtendedString)
{
SqlExtendedString extendedString = cellValue as SqlExtendedString;
if (extendedString.IsResource())
{
// NOTE: We create an UriRef for correct equality comparision with fragment identifiers.
return(new UriRef(extendedString.ToString(), UriKind.RelativeOrAbsolute));
}
else if (extendedString.IsString() || extendedString.IsBlankId())
{
return(extendedString.ToString());
}
}
else if (cellValue is SqlRdfBox)
{
SqlRdfBox box = cellValue as SqlRdfBox;
if (box.StrType != null)
{
try
{
// NOTE: We create an UriRef for correct equality comparision with fragment identifiers.
return(XsdTypeMapper.DeserializeString(box.Value.ToString(), new UriRef(box.StrType)));
}
catch (KeyNotFoundException)
{
// The given data type is not known by the XsdTypeMapper.
return(box.Value.ToString());
}
}
else if (box.Value is SqlExtendedString && box.StrLang != null)
{
return(new Tuple <string, CultureInfo>(box.Value.ToString(), new CultureInfo(box.StrLang)));
}
else if (box.Value != null)
{
return(box.Value.ToString());
}
}
else if (cellValue is int)
{
// TODO: We need a different approach to store and read booleans.
return(cellValue);
}
else if (cellValue is DateTime)
{
// Virtuoso delivers the time not as UTC but as "unspecified"
// we convert it to local time
return(((DateTime)cellValue).ToLocalTime());
}
else if (cellValue is VirtuosoDateTimeOffset)
{
return(((VirtuosoDateTimeOffset)cellValue).Value.UtcDateTime.ToUniversalTime());
}
return(cellValue);
}
public static bool IsString(this SqlExtendedString extendedString)
{
return(extendedString.IriType == SqlExtendedStringType.IRI && extendedString.StrType == SqlExtendedStringType.BNODE);
}
public static bool IsBlankId(this SqlExtendedString extendedString)
{
return(extendedString.IriType == SqlExtendedStringType.BNODE);
}
public static bool IsResource(this SqlExtendedString extendedString)
{
return(extendedString.IriType == SqlExtendedStringType.IRI && extendedString.StrType == SqlExtendedStringType.IRI);
}
