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Collateral.cs
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58 lines (51 loc) · 1.51 KB
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
using System.Runtime.CompilerServices;
namespace Microsoft.ClearScript.Util
{
internal class CollateralObject<THolder, TValue>
where THolder : class
where TValue : class
{
private readonly ConditionalWeakTable<THolder, TValue> table = new ConditionalWeakTable<THolder, TValue>();
public TValue Get(THolder holder)
{
TValue value;
return table.TryGetValue(holder, out value) ? value : null;
}
public TValue GetOrCreate(THolder holder)
{
return table.GetOrCreateValue(holder);
}
public virtual void Set(THolder holder, TValue value)
{
Clear(holder);
if (value != null)
{
table.Add(holder, value);
}
}
public void Clear(THolder holder)
{
table.Remove(holder);
}
}
internal sealed class CollateralArray<THolder, TElement> : CollateralObject<THolder, TElement[]> where THolder : class
{
public override void Set(THolder holder, TElement[] value)
{
if (value == null)
{
Clear(holder);
}
else if (value.Length > 0)
{
base.Set(holder, value);
}
else
{
base.Set(holder, ArrayHelpers.GetEmptyArray<TElement>());
}
}
}
}