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//
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See License.txt in the project root for license information.
//
// This file contain implementations details that are subject to change without notice.
// Use at your own risk.
//
using System;
using System.Diagnostics;
namespace Microsoft.VisualStudio.Text.Implementation
{
/// <summary>
/// Base class for a page that participates in an MRU list.
/// </summary>
internal class Page
{
private WeakReference<char[]> _uncompressedContents;
private byte[] _compressedContents;
public readonly int Length;
public readonly PageManager Manager;
public Page(PageManager manager, char[] contents, int length)
{
this.Manager = manager;
this.Length = length;
_uncompressedContents = new WeakReference<char[]>(contents);
_compressedContents = Compressor.Compress(contents, length);
}
public char[] Expand()
{
char[] contents;
if (!_uncompressedContents.TryGetTarget(out contents))
{
contents = new char[this.Length];
Compressor.Decompress(_compressedContents, this.Length, contents);
_uncompressedContents.SetTarget(contents);
}
this.Manager.UpdateMRU(this);
return contents;
}
}
}
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