/* ****************************************************************************
 *
 * Copyright (c) Microsoft Corporation. All rights reserved.
 *
 * This software is subject to the Microsoft Public License (Ms-PL). 
 * A copy of the license can be found in the license.htm file included 
 * in this distribution.
 *
 * You must not remove this notice, or any other, from this software.
 *
 * ***************************************************************************/

namespace System.Web.Mvc {
    using System;
    using System.Diagnostics.CodeAnalysis;
    using System.Web.Caching;
    using System.Web.Mvc.Resources;

    [SuppressMessage("Microsoft.Security", "CA2112:SecuredTypesShouldNotExposeFields",
        Justification = "The Null field does not have access to secure information")]
    public class DefaultViewLocationCache : IViewLocationCache {
        private static readonly TimeSpan _defaultTimeSpan = new TimeSpan(0, 15, 0);

        public DefaultViewLocationCache()
            : this(_defaultTimeSpan) {
        }

        public DefaultViewLocationCache(TimeSpan timeSpan) {
            if (timeSpan.Ticks < 0) {
                throw new InvalidOperationException(MvcResources.DefaultViewLocationCache_NegativeTimeSpan);
            }
            TimeSpan = timeSpan;
        }

        [SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes",
            Justification = "The reference type is immutable. ")]
        public static readonly IViewLocationCache Null = new NullViewLocationCache();

        public TimeSpan TimeSpan {
            get;
            private set;
        }

        #region IViewLocationCache Members
        public string GetViewLocation(HttpContextBase httpContext, string key) {
            if (httpContext == null) {
                throw new ArgumentNullException("httpContext");
            }
            return (string)httpContext.Cache[key];
        }

        public void InsertViewLocation(HttpContextBase httpContext, string key, string virtualPath) {
            if (httpContext == null) {
                throw new ArgumentNullException("httpContext");
            }
            httpContext.Cache.Insert(key, virtualPath, null /* dependencies */, Cache.NoAbsoluteExpiration, TimeSpan);
        }
        #endregion
    }
}