89 lines
No EOL
2 KiB
C#
89 lines
No EOL
2 KiB
C#
using System;
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using System.Reflection;
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using System.Collections;
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using System.Collections.Generic;
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using System.Text;
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namespace Server.Commands.Generic
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{
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public sealed class DistinctExtension : BaseExtension
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{
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public static ExtensionInfo ExtInfo = new ExtensionInfo( 30, "Distinct", -1, delegate() { return new DistinctExtension(); } );
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public static void Initialize()
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{
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ExtensionInfo.Register( ExtInfo );
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}
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public override ExtensionInfo Info
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{
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get { return ExtInfo; }
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}
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private List<Property> m_Properties;
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private IComparer m_Comparer;
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public DistinctExtension()
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{
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m_Properties = new List<Property>();
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}
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public override void Optimize( Mobile from, Type baseType, ref AssemblyEmitter assembly )
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{
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if ( baseType == null )
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throw new Exception( "Distinct extension may only be used in combination with an object conditional." );
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foreach ( Property prop in m_Properties )
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{
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prop.BindTo( baseType, PropertyAccess.Read );
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prop.CheckAccess( from );
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}
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if ( assembly == null )
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assembly = new AssemblyEmitter( "__dynamic", false );
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m_Comparer = DistinctCompiler.Compile( assembly, baseType, m_Properties.ToArray() );
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}
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public override void Parse( Mobile from, string[] arguments, int offset, int size )
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{
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if ( size < 1 )
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throw new Exception( "Invalid distinction syntax." );
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int end = offset + size;
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while ( offset < end )
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{
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string binding = arguments[offset++];
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m_Properties.Add( new Property( binding ) );
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}
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}
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public override void Filter( ArrayList list )
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{
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if ( m_Comparer == null )
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throw new InvalidOperationException( "The extension must first be optimized." );
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ArrayList copy = new ArrayList( list );
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copy.Sort( m_Comparer );
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list.Clear();
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object last = null;
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for ( int i = 0; i < copy.Count; ++i )
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{
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object obj = copy[i];
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if ( last == null || m_Comparer.Compare( obj, last ) != 0 )
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{
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list.Add( obj );
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last = obj;
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}
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}
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}
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}
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} |