public ISearchResult Find(SearchOptions options, bool reverse)
{
// insanity check
Debug.Assert(searchStrategy != null);
Debug.Assert(documentIterator != null);
Debug.Assert(options != null);
while (!cancelled)
{
if (info != null && textIterator != null && documentIterator.CurrentFileName != null) {
if (info.FileName != documentIterator.CurrentFileName || lastWasReverse != reverse) {
// create new iterator, if document changed or search direction has changed.
info = documentIterator.Current;
textIterator = info.GetTextIterator ();
reverseSearchMap = null;
lastResultPos = -1;
if (reverse)
textIterator.MoveToEnd ();
}
ISearchResult result;
if (!reverse)
result = searchStrategy.FindNext (textIterator, options, false);
else {
if (searchStrategy.SupportsReverseSearch (textIterator, options)) {
result = searchStrategy.FindNext (textIterator, options, true);
}
else {
if (reverseSearchMap == null) {
reverseSearchMap = new SearchMap ();
reverseSearchMap.Build (searchStrategy, textIterator, options);
}
if (lastResultPos == -1)
lastResultPos = textIterator.Position;
result = reverseSearchMap.GetPreviousMatch (lastResultPos);
if (result != null)
textIterator.Position = result.Position;
}
}
if (result != null) {
matches++;
lastResultPos = result.Position;
lastWasReverse = reverse;
return result;
}
}
if (textIterator != null) textIterator.Close ();
// not found or first start -> move forward to the next document
bool more = !reverse ? documentIterator.MoveForward () : documentIterator.MoveBackward ();
if (more) {
searchedFiles++;
info = documentIterator.Current;
textIterator = info.GetTextIterator ();
reverseSearchMap = null;
lastResultPos = -1;
if (reverse)
textIterator.MoveToEnd ();
}
else
cancelled = true;
lastWasReverse = reverse;
}
cancelled = false;
return null;
}
public void Reset()
{
documentIterator.Reset();
textIterator = null;
reverseSearchMap = null;
cancelled = false;
searchedFiles = 0;
matches = 0;
lastResultPos = -1;
}