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ScheduleFilter.cs

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+/***************************************************************************
+ * Copyright Andy Brummer 2004-2005
+ * 
+ * This code is provided "as is", with absolutely no warranty expressed
+ * or implied. Any use is at your own risk.
+ *
+ * This code may be used in compiled form in any way you desire. This
+ * file may be redistributed unmodified by any means provided it is
+ * not sold for profit without the authors written consent, and
+ * providing that this notice and the authors name is included. If
+ * the source code in  this file is used in any commercial application
+ * then a simple email would be nice.
+ * 
+ **************************************************************************/
+
+using System;
+using System.Collections;
+
+namespace UtilidadesCSharp.Schedule
+{
+	/// <summary>
+	/// This is an empty filter that does not filter any of the events.
+	/// </summary>
+	public class Filter : IResultFilter
+	{
+		public static IResultFilter Empty = new Filter();
+		private Filter() {}
+
+		public void FilterResultsInInterval(DateTime Start, DateTime End, ArrayList List)
+		{
+			if (List == null)
+				return;
+			List.Sort();
+		}
+	}
+
+	/// <summary>
+	/// This causes only the first event of the interval to be counted.
+	/// </summary>
+	public class FirstEventFilter : IResultFilter
+	{
+		public static IResultFilter Filter = new FirstEventFilter();
+		private FirstEventFilter() {}
+
+		public void FilterResultsInInterval(DateTime Start, DateTime End, ArrayList List)
+		{
+			if (List == null)
+				return;
+			if (List.Count < 2)
+				return;
+			List.Sort();
+			List.RemoveRange(1, List.Count-1);
+		}
+	}
+
+	/// <summary>
+	/// This causes only the last event of the interval to be counted.
+	/// </summary>
+	public class LastEventFilter : IResultFilter
+	{
+		public static IResultFilter Filter = new LastEventFilter();
+		private LastEventFilter() {}
+
+		public void FilterResultsInInterval(DateTime Start, DateTime End, ArrayList List)
+		{
+			if (List == null)
+				return;
+			if (List.Count < 2)
+				return;
+			List.Sort();
+			List.RemoveRange(0, List.Count-1);
+		}
+	}
+
+}