///////////////////////////////////////////////////////////////////////////////
//
//  Microsoft Research Singularity
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
//  File:   DirectoryCache.sg
//
//  Note:
//
//  This cache is for recently closed directories.  Opened
//  directories are not stored here.  This cache exists because
//  opening a directory entails a non-trivial amount of work.
//
//  Directories do not have a fixed size and this cache should
//  probably take this into account.

namespace Microsoft.Singularity.Services.Fat.Fs
{
    internal class DirectoryCache
    {
        FsObjectCache! cache;

        internal DirectoryCache(uint capacity)
        {
            this.cache = new FsObjectCache(capacity);
        }

        internal void Add(int firstCluster, Directory! directory)
        {
            cache.Add(firstCluster, directory);
        }

        internal Directory Get(int firstCluster)
        {
            return (Directory)cache.Get(firstCluster);
        }
    }
}