/// <summary>Merges all segments together into a single segment, optimizing an index
/// for search.
/// </summary>
public virtual void Optimize()
{
lock (this)
{
FlushRamSegments();
while (segmentInfos.Count > 1 || (segmentInfos.Count == 1 && (SegmentReader.HasDeletions(segmentInfos.Info(0)) || segmentInfos.Info(0).dir != directory || (useCompoundFile && (!SegmentReader.UsesCompoundFile(segmentInfos.Info(0)) || SegmentReader.HasSeparateNorms(segmentInfos.Info(0)))))))
{
int minSegment = segmentInfos.Count - mergeFactor;
MergeSegments(minSegment < 0?0:minSegment);
}
segmentInfos.Optimize(directory);
}
}