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Viewing changes to src/AddIns/Debugger/Debugger.AddIn/Visualizers/GridVisualizer/ValueProviders/ListValuesProvider.cs

  • Committer: sk
  • Date: 2011-09-10 05:17:57 UTC
  • Revision ID: halega@halega.com-20110910051757-qfouz1llya9m6boy
4.1.0.7915 Release Candidate 1

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src/AddIns/Debugger/Debugger.AddIn/Visualizers/GridVisualizer/ValueProviders/ListValuesProvider.cs
 
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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
 
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// This code is distributed under the BSD license (for details please see \src\AddIns\Debugger\Debugger.AddIn\license.txt)
 
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using System;
 
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using System.Collections.Generic;
 
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using System.Linq;
 
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using System.Reflection;
 
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using Debugger.AddIn.Visualizers.Utils;
 
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using Debugger.MetaData;
 
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using ICSharpCode.Core;
 
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using ICSharpCode.NRefactory.Ast;
 
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using ICSharpCode.SharpDevelop.Services;
 
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namespace Debugger.AddIn.Visualizers.GridVisualizer
 
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{
 
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        /// <summary>
 
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        ///  Provides <see cref="ObjectValue"/>s for debugee objects implementing IList.
 
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        /// </summary>
 
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        public class ListValuesProvider : GridValuesProvider, IListValuesProvider<ObjectValue>
 
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        {
 
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                int? listCount = null;
 
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                /// <summary>
 
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                /// After evaluating how many items to clear debugger Expression cache,
 
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                /// so that the cache does not keep too many PermanentReferences.
 
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                /// </summary>
 
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                static readonly int ClearCacheThreshold = 50;
 
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                public ListValuesProvider(Expression targetObject, DebugType listItemType)
 
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                        :base(targetObject, listItemType)
 
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                {
 
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                }
 
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                public int GetCount()
 
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                {
 
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                        if (this.listCount == null) {
 
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                                this.listCount = this.targetObject.GetIListCount();
 
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                        }
 
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                        return this.listCount.Value;
 
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                }
 
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                /// <summary>When this reaches ClearCacheThreshold, the debugger Expression cache is cleared.</summary>
 
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                int itemClearCacheCounter = 0;
 
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                public ObjectValue GetItemAt(int index)
 
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                {
 
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                        if (itemClearCacheCounter++ > ClearCacheThreshold) {
 
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                                // clear debugger Expression cache to avoid holding too many PermanentReferences
 
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                                WindowsDebugger.CurrentProcess.ClearExpressionCache();
 
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                                LoggingService.Info("Cleared debugger Expression cache.");
 
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                                itemClearCacheCounter = 0;
 
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                        }
 
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                        return ObjectValue.Create(
 
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                                targetObject.AppendIndexer(index).Evaluate(WindowsDebugger.CurrentProcess),
 
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                                //targetObject.AppendIndexer(index), // use Expression instead of value - possible only for IList though
 
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                                index,
 
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                                this.memberFromNameMap);
 
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                }
 
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        }
 
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}