/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System;
using System.IO;
using System.Security.Permissions;
using Microsoft.Scripting.Utils;
namespace Microsoft.Scripting{
/// <summary>
/// Provides a StreamContentProvider for a stream of content backed by a file on disk.
/// </summary>
[Serializable]
internal sealed class FileStreamContentProvider : StreamContentProvider {
private readonly string _path;
private readonly PALHolder _pal;
internal string Path {
get { return _path; }
}
#region Construction
internal FileStreamContentProvider(PlatformAdaptationLayer pal, string path) {
Assert.NotNull(pal, path);
_path = path;
_pal = new PALHolder(pal);
}
#endregion
public override Stream GetStream() {
return _pal.GetStream(Path);
}
[Serializable]
private class PALHolder
#if !SILVERLIGHT
: MarshalByRefObject
#endif
{
[NonSerialized]
private readonly PlatformAdaptationLayer _pal;
internal PALHolder(PlatformAdaptationLayer pal) {
_pal = pal;
}
internal Stream GetStream(string path) {
return _pal.OpenInputFileStream(path);
}
#if !SILVERLIGHT
// TODO: Figure out what is the right lifetime
[SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.Infrastructure)]
public override object InitializeLifetimeService() {
return null;
}
#endif
}
}
}
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