#region Copyright
// 
// DotNetNuke® - https://www.dnnsoftware.com
// Copyright (c) 2002-2018
// by DotNetNuke Corporation
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated 
// documentation files (the "Software"), to deal in the Software without restriction, including without limitation 
// the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and 
// to permit persons to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or substantial portions 
// of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED 
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF 
// CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
// DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.IO;
using System.Web;
using System.Web.Caching;

namespace DotNetNuke.Services.OutputCache.Providers
{
    /// <summary>
    /// FileResponseFilter implements the OutputCacheRepsonseFilter to capture the response into memory.
    /// </summary>
    public class MemoryResponseFilter : OutputCacheResponseFilter
    {
        //Private _content As StringBuilder
        private static System.Web.Caching.Cache runtimeCache;

        internal MemoryResponseFilter(int itemId, int maxVaryByCount, Stream filterChain, string cacheKey, TimeSpan cacheDuration) : base(filterChain, cacheKey, cacheDuration, maxVaryByCount)
        {
            if (maxVaryByCount > -1 && Services.OutputCache.Providers.MemoryProvider.GetCacheKeys(itemId).Count >= maxVaryByCount)
            {
                HasErrored = true;
                return;
            }
            CaptureStream = new MemoryStream();
        }

        protected static System.Web.Caching.Cache Cache
        {
            get
            {
                //create singleton of the cache object
                if (runtimeCache == null)
                {
                    runtimeCache = HttpRuntime.Cache;
                }
                return runtimeCache;
            }
        }

        protected override void AddItemToCache(int itemId, string output)
        {
            Cache.Insert(CacheKey, output, null, DateTime.UtcNow.Add(CacheDuration), System.Web.Caching.Cache.NoSlidingExpiration, CacheItemPriority.Default, null);
        }

        protected override void RemoveItemFromCache(int itemId)
        {
            Cache.Remove(CacheKey);
        }
    }
}