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//----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------------------
namespace System.IdentityModel
{
using System;
using System.Runtime;
internal abstract class BufferManager
{
public abstract byte[] TakeBuffer(int bufferSize);
public abstract void ReturnBuffer(byte[] buffer);
public abstract void Clear();
public static BufferManager CreateBufferManager(long maxBufferPoolSize, int maxBufferSize)
{
if (maxBufferPoolSize < 0)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("maxBufferPoolSize",
maxBufferPoolSize, SR.GetString(SR.ValueMustBeNonNegative)));
}
if (maxBufferSize < 0)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("maxBufferSize",
maxBufferSize, SR.GetString(SR.ValueMustBeNonNegative)));
}
return new WrappingBufferManager(InternalBufferManager.Create(maxBufferPoolSize, maxBufferSize));
}
internal static InternalBufferManager GetInternalBufferManager(BufferManager bufferManager)
{
if (bufferManager is WrappingBufferManager)
{
return ((WrappingBufferManager)bufferManager).InternalBufferManager;
}
else
{
return new WrappingInternalBufferManager(bufferManager);
}
}
class WrappingBufferManager : BufferManager
{
InternalBufferManager innerBufferManager;
public WrappingBufferManager(InternalBufferManager innerBufferManager)
{
this.innerBufferManager = innerBufferManager;
}
public InternalBufferManager InternalBufferManager
{
get { return this.innerBufferManager; }
}
public override byte[] TakeBuffer(int bufferSize)
{
if (bufferSize < 0)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("bufferSize", bufferSize,
SR.GetString(SR.ValueMustBeNonNegative)));
}
return this.innerBufferManager.TakeBuffer(bufferSize);
}
public override void ReturnBuffer(byte[] buffer)
{
if (buffer == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("buffer");
}
this.innerBufferManager.ReturnBuffer(buffer);
}
public override void Clear()
{
this.innerBufferManager.Clear();
}
}
class WrappingInternalBufferManager : InternalBufferManager
{
BufferManager innerBufferManager;
public WrappingInternalBufferManager(BufferManager innerBufferManager)
{
this.innerBufferManager = innerBufferManager;
}
public override void Clear()
{
this.innerBufferManager.Clear();
}
public override void ReturnBuffer(byte[] buffer)
{
this.innerBufferManager.ReturnBuffer(buffer);
}
public override byte[] TakeBuffer(int bufferSize)
{
return this.innerBufferManager.TakeBuffer(bufferSize);
}
}
}
}
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