#W# Initial Commit: Avatars Conquest

Scripts/Commands/Generic/Extensions/DistinctExtension.cs

@@ -0,0 +1,89 @@
+using System;
+using System.Reflection;
+using System.Collections;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Server.Commands.Generic
+{
+	public sealed class DistinctExtension : BaseExtension
+	{
+		public static ExtensionInfo ExtInfo = new ExtensionInfo( 30, "Distinct", -1, delegate() { return new DistinctExtension(); } );
+
+		public static void Initialize()
+		{
+			ExtensionInfo.Register( ExtInfo );
+		}
+
+		public override ExtensionInfo Info
+		{
+			get { return ExtInfo; }
+		}
+
+		private List<Property> m_Properties;
+
+		private IComparer m_Comparer;
+
+		public DistinctExtension()
+		{
+			m_Properties = new List<Property>();
+		}
+
+		public override void Optimize( Mobile from, Type baseType, ref AssemblyEmitter assembly )
+		{
+			if ( baseType == null )
+				throw new Exception( "Distinct extension may only be used in combination with an object conditional." );
+
+			foreach ( Property prop in m_Properties )
+			{
+				prop.BindTo( baseType, PropertyAccess.Read );
+				prop.CheckAccess( from );
+			}
+
+			if ( assembly == null )
+				assembly = new AssemblyEmitter( "__dynamic", false );
+
+			m_Comparer = DistinctCompiler.Compile( assembly, baseType, m_Properties.ToArray() );
+		}
+
+		public override void Parse( Mobile from, string[] arguments, int offset, int size )
+		{
+			if ( size < 1 )
+				throw new Exception( "Invalid distinction syntax." );
+
+			int end = offset + size;
+
+			while ( offset < end )
+			{
+				string binding = arguments[offset++];
+
+				m_Properties.Add( new Property( binding ) );
+			}
+		}
+
+		public override void Filter( ArrayList list )
+		{
+			if ( m_Comparer == null )
+				throw new InvalidOperationException( "The extension must first be optimized." );
+
+			ArrayList copy = new ArrayList( list );
+
+			copy.Sort( m_Comparer );
+
+			list.Clear();
+
+			object last = null;
+
+			for ( int i = 0; i < copy.Count; ++i )
+			{
+				object obj = copy[i];
+
+				if ( last == null || m_Comparer.Compare( obj, last ) != 0 )
+				{
+					list.Add( obj );
+					last = obj;
+				}
+			}
+		}
+	}
+}