AnalyzeEmailNetworkInternal
(
OleDbDataReader oDataReader,
Boolean bUseCcForEdgeWeights,
Boolean bUseBccForEdgeWeights,
BackgroundWorker oBackgroundWorker,
DoWorkEventArgs oDoWorkEventArgs
)
{
Debug.Assert(oDataReader != null);
Debug.Assert(oBackgroundWorker == null || oDoWorkEventArgs != null);
AssertValid();
// Create a dictionary to keep track of participant pairs. The key is
// the pair of participants in the format used by ParticipantsToKey()
// and the value is the edge weight between the participants. The
// contents of this aggregated dictionary get returned by this method.
Dictionary<String, Int32> oAggregatedDictionary =
new Dictionary<String, Int32>();
// Loop through the email items.
Int64 iRecords = 0;
while ( oDataReader.Read() )
{
try
{
Object oFromField = oDataReader["System.Message.FromAddress"];
Object oToField = oDataReader["System.Message.ToAddress"];
Object oCcField = oDataReader["System.Message.CcAddress"];
Object oBccField = oDataReader["System.Message.BccAddress"];
AnalyzeOneEmail(oFromField, oToField, oCcField, oBccField,
bUseCcForEdgeWeights, bUseBccForEdgeWeights,
oAggregatedDictionary);
}
catch (OleDbException)
{
// In June 2009, a NodeXL team member got a repeatable
// OleDbException while attempting to analyze his email for a
// certain date range. Unfortunately, the team member was on
// the other side of the country and the exception had no inner
// exceptions to provide more details. (OleDbException uses a
// custom Errors collection instead of inner exceptions, and
// that collection doesn't get displayed by NodeXL's generic
// error-handling scheme). Therefore, the exact cause of the
// error couldn't be determined.
//
// However, the error went away when the date range was
// altered, leading me to believe that an email with an invalid
// field was encountered. Although the DataReader.Item[] and
// AnalyzeOneEmail() calls shouldn't throw an exception on a
// bad field, there may be some invalid field condition I'm
// overlooking.
//
// Workaround: Skip emails that throw such an exception.
}
if (oBackgroundWorker != null)
{
// Check whether a cancellation has been requested.
if (iRecords % AsyncCancelInterval == 0 &&
oBackgroundWorker.CancellationPending)
{
// Cancel the analysis.
Debug.Assert(oDoWorkEventArgs != null);
oDoWorkEventArgs.Cancel = true;
return ( new EmailParticipantPair[0] );
}
}
iRecords++;
}
// Convert the aggregated results to an array of EmailParticipantPair
// objects.
EmailParticipantPair [] aoEmailParticipantPairs =
new EmailParticipantPair[oAggregatedDictionary.Count];
Int32 i = 0;
foreach (KeyValuePair<String, Int32> oKeyValuePair in
oAggregatedDictionary)
{
String sParticipant1, sParticipant2;
KeyToParticipants(oKeyValuePair.Key,
out sParticipant1, out sParticipant2);
aoEmailParticipantPairs[i] = new EmailParticipantPair(
sParticipant1, sParticipant2, oKeyValuePair.Value);
i++;
}
return (aoEmailParticipantPairs);
}
PopulateEdgesTable
(
EmailParticipantPair [] aoEmailParticipantPairs
)
{
Debug.Assert(aoEmailParticipantPairs != null);
Debug.Assert(m_oEdgeTable != null);
AssertValid();
Int32 iEmailParticipantPairs = aoEmailParticipantPairs.Length;
if (iEmailParticipantPairs == 0)
{
return;
}
// Create and populate an array of edge weights.
Object [,] aoEdgeWeights = new Object [iEmailParticipantPairs, 1];
for (Int32 i = 0; i < iEmailParticipantPairs; i++)
{
EmailParticipantPair oEmailParticipantPair =
aoEmailParticipantPairs[i];
// Modify the pariticpant strings.
oEmailParticipantPair.Participant1 =
AnalyzerToParticipant(oEmailParticipantPair.Participant1);
oEmailParticipantPair.Participant2 =
AnalyzerToParticipant(oEmailParticipantPair.Participant2);
aoEdgeWeights[i, 0] = oEmailParticipantPair.EdgeWeight.ToString();
}
Int32 iRowOffsetToWriteTo = 0;
if (!m_bClearTablesFirst)
{
iRowOffsetToWriteTo = ExcelTableUtil.GetOffsetOfFirstEmptyTableRow(
m_oEdgeTable);
}
// Write the arrays to the edge table.
NodeXLWorkbookUtil.PopulateEdgeTableWithParticipantPairs(
m_oEdgeTable, aoEmailParticipantPairs, iRowOffsetToWriteTo);
SetEdgeWeightValues(aoEdgeWeights, iRowOffsetToWriteTo);
ExcelUtil.ActivateWorksheet(m_oEdgeTable);
}