/// <summary>
/// Reads the events from <paramref name="eventStream"/> into a <see cref="Collections.Generic.LinkedList"/>.
/// The predicates associated with each event are counted and any which occur at least <paramref name="cutoff"/>
/// times are added to the <paramref name="predicateIndex"/> dictionary along
/// with an unique integer index.
/// </summary>
/// <param name="eventStream">The event stream.</param>
/// <param name="predicateIndex">Index of the predicate.</param>
/// <param name="cutoff">The cutoff.</param>
/// <returns>A <see cref="Collections.Generic.LinkedList"/> of events.</returns>
private LinkedList <Event> ComputeEventCounts(IEventStream eventStream, Dictionary <string, int> predicateIndex, int cutoff)
{
LinkedList <Event> events = new LinkedList <Event>();
HashSet <string> predicatesSet = new HashSet <string>();
IDictionary <string, int> counter = new Dictionary <string, int>();
while (eventStream.HasNext())
{
Event next = eventStream.Next();
events.AddLast(next);
Update(next.Context, predicatesSet, counter, cutoff);
}
PredicateCounts = new int[predicatesSet.Count];
int index = 0;
HashSet <string> .Enumerator enumerator = predicatesSet.GetEnumerator();
while (enumerator.MoveNext())
{
string predicate = enumerator.Current;
PredicateCounts[index] = counter[predicate];
predicateIndex[predicate] = index;
}
return(events);
}
/// <summary>
/// Reads the events from <paramref name="eventStream"/> into a <see cref="Collections.Generic.LinkedList"/>.
/// The predicates associated with each event are counted and any which occur at least <paramref name="cutoff"/>
/// times are added to the <paramref name="predicateIndex"/> dictionary along
/// with an unique integer index.
/// </summary>
/// <param name="eventStream">The event stream.</param>
/// <param name="predicateIndex">Index of the predicate.</param>
/// <param name="cutoff">The cutoff.</param>
/// <returns>A <see cref="Collections.Generic.LinkedList"/> of events.</returns>
private LinkedList<Event> ComputeEventCounts(IEventStream eventStream, Dictionary<string, int> predicateIndex, int cutoff)
{
LinkedList<Event> events = new LinkedList<Event>();
HashSet<string> predicatesSet = new HashSet<string>();
IDictionary<string, int> counter = new Dictionary<string, int>();
while (eventStream.HasNext())
{
Event next = eventStream.Next();
events.AddLast(next);
Update(next.Context, predicatesSet, counter, cutoff);
}
PredicateCounts = new int[predicatesSet.Count];
int index = 0;
HashSet<string>.Enumerator enumerator = predicatesSet.GetEnumerator();
while (enumerator.MoveNext())
{
string predicate = enumerator.Current;
PredicateCounts[index] = counter[predicate];
predicateIndex[predicate] = index;
}
return events;
}