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Test if -specific- content has changed since last FTIndex

In the previous version of this test, I tested against all documents in the database.

The app I made the function for has now started using caching through documents, so the requirements for the test has changed. I now need to know if a subset of the documents have changed. The FTIndex doesn't need to be updated if the cache changes..

The updated version takes a second parameter, a Search-query. This lets you filter out only the content you're interested in.

Function contentChangedSinceLastFTIndex( db As NotesDatabase, Byval query As String ) As Boolean 
 Dim session As New NotesSession
 
 Dim lastFTIndexed As Variant
 lastFTIndexed = db.LastFTIndexed
 
 '// First test (least resource-hungry)
 If Not ( db.LastModified > lastFTIndexed ) Then 
  contentChangedSinceLastFTIndex = False
  Exit Function
 End If
 
 '// Conclusive test - test if actual documents (not design elements) have
 '// been changed since last FTIndex
 Dim dateFTIndexed As New NotesDateTime ( lastFTIndexed ) 
 Dim col As NotesDocumentCollection
 If query = "" Then
  '// Has any document changed?
  Set col = db.GetModifiedDocuments( dateFTIndexed )
 Else '// Has documents fitting [query] changed since last FTIndex?
  
  '// Adjust the FTIndexed-date by a second, to avoid getting the 
  '// last saved document (if the FT-index is up to date)
  Call dateFTIndexed.AdjustSecond( 1 )
  Set col = db.Search( query, dateFTIndexed, 0 )
 End If 
 If col.Count > 0 Then contentChangedSinceLastFTIndex = True  
 
End Function

Don't worry about speed. In my test-app, the search takes less than a millisecond with a close cutoff date.

Update: Leus' Mobiele wrote a Java version of the above code:

private boolean contentChangedSinceLastFTIndex( Database db, String query) throws NotesException {
 DateTime dateFTIndexed = db.getLastFTIndexed();

 // First test (least resource-hungry)
 if ( db.getLastModified().timeDifference( dateFTIndexed ) <= 0) {
  return false;
 }

 // Conclusive test - test if actual documents (not design elements) have
 // been changed since last FTIndex 

 DocumentCollection col;

 if (query.length() == 0) { // Has any document changed?  
  col = db.getModifiedDocuments( dateFTIndexed );
 } else {
  // Has documents fitting [query] changed since last FTIndex?
  // Adjust the FTIndexed-date by a second, to avoid getting the
  // last saved document (if the FT-index is up to date)

  dateFTIndexed.adjustSecond(1);
  col = db.search( query, dateFTIndexed, 0);
 } 

 if (col.getCount() > 0) {
  return true;
 } else {
  return false;
 }
}