HttpCacheVaryByContentEncodings.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / HttpCacheVaryByContentEncodings.cs / 1305376 / HttpCacheVaryByContentEncodings.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 * HttpCacheVaryByContentEncodings 
 *
 * Copyright (c) 1998 Microsoft Corporation 
 */

namespace System.Web {
    using System.Text; 
    using System.Runtime.InteropServices;
    using System.Web.Util; 
    using System.Security.Permissions; 

 
    /// 
    ///    Provides a type-safe way to vary by Content-Encoding.
    /// 
    public sealed class HttpCacheVaryByContentEncodings { 
        String[]        _contentEncodings;
        bool            _isModified; 
 
        public HttpCacheVaryByContentEncodings() {
            Reset(); 
        }

        internal void Reset() {
            _isModified = false; 
            _contentEncodings = null;
        } 
 
        /*
         * Reset based on content encodings. 
         */
        internal void ResetFromContentEncodings(String[] contentEncodings) {
            Reset();
            if (contentEncodings != null) { 
                _isModified = true;
                _contentEncodings = new String[contentEncodings.Length]; 
                for (int i = 0; i < contentEncodings.Length; i++) { 
                    _contentEncodings[i] = contentEncodings[i];
                } 
            }
        }

        // the response is not cacheable if we're varying by content encoding 
        // and the content-encoding header is not one of the encodings that we're
        // varying by 
        internal bool IsCacheableEncoding(string coding) { 
            // return true if we are not varying by content encoding.
            if (_contentEncodings == null) { 
                return true;
            }

            // return true if there is no Content-Encoding header 
            if (coding == null) {
                return true; 
            } 

            // return true if the Content-Encoding header is listed 
            for (int i = 0; i < _contentEncodings.Length; i++) {
                if (_contentEncodings[i] == coding) {
                    return true;
                } 
            }
 
            // return false if the Content-Encoding header is not listed 
            return false;
        } 

        internal bool IsModified() {
            return _isModified;
        } 

        internal String[] GetContentEncodings() { 
            return _contentEncodings; 
        }
 
        //
        // Public methods and properties
        //
 

        ///  
        ///     Default property. 
        ///       Indexed property indicating that a cache should (or should not) vary according
        ///       to a Content-Encoding. 
        /// 
        public bool this[String contentEncoding]
        {
            get { 
                if (String.IsNullOrEmpty(contentEncoding)) {
                    throw new ArgumentNullException(SR.GetString(SR.Parameter_NullOrEmpty, "contentEncoding")); 
                } 
                if (_contentEncodings == null) {
                    return false; 
                }
                for(int i = 0; i < _contentEncodings.Length; i++) {
                    if (_contentEncodings[i] == contentEncoding) {
                        return true; 
                    }
                } 
                return false; 
            }
 
            set {
                if (String.IsNullOrEmpty(contentEncoding)) {
                    throw new ArgumentNullException(SR.GetString(SR.Parameter_NullOrEmpty, "contentEncoding"));
                } 

                // if someone enabled it, don't allow someone else to disable it. 
                if (!value) { 
                    return;
                } 

                _isModified = true;
                if (_contentEncodings != null) {
                    string[] contentEncodings = new String[_contentEncodings.Length + 1]; 
                    for (int i = 0; i < _contentEncodings.Length; i++) {
                        contentEncodings[i] = _contentEncodings[i]; 
                    } 
                    contentEncodings[contentEncodings.Length - 1] = contentEncoding;
                    _contentEncodings = contentEncodings; 
                    return;
                }
                _contentEncodings = new String[1];
                _contentEncodings[0] = contentEncoding; 
            }
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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HttpCacheVaryByContentEncodings.cs source code in C# .NET

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