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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
namespace System.Web.WebPages
{
/// <summary>
/// Template stacks store a stack of template files. WebPageExecutingBase implements this type, so when executing Plan9 or Mvc WebViewPage,
/// the stack would contain instances of the page.
/// The stack can be queried to identify properties of the current executing file such as the virtual path of the file.
/// </summary>
[SuppressMessage("Microsoft.Naming", "CA1711:IdentifiersShouldNotHaveIncorrectSuffix", Justification = "TemplateStack is a stack")]
public static class TemplateStack
{
private static readonly object _contextKey = new object();
public static ITemplateFile GetCurrentTemplate(HttpContextBase httpContext)
{
if (httpContext == null)
{
throw new ArgumentNullException("httpContext");
}
return GetStack(httpContext).FirstOrDefault();
}
public static ITemplateFile Pop(HttpContextBase httpContext)
{
if (httpContext == null)
{
throw new ArgumentNullException("httpContext");
}
return GetStack(httpContext).Pop();
}
public static void Push(HttpContextBase httpContext, ITemplateFile templateFile)
{
if (templateFile == null)
{
throw new ArgumentNullException("templateFile");
}
if (httpContext == null)
{
throw new ArgumentNullException("httpContext");
}
GetStack(httpContext).Push(templateFile);
}
private static Stack<ITemplateFile> GetStack(HttpContextBase httpContext)
{
var stack = httpContext.Items[_contextKey] as Stack<ITemplateFile>;
if (stack == null)
{
stack = new Stack<ITemplateFile>();
httpContext.Items[_contextKey] = stack;
}
return stack;
}
}
}
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