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/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / HttpCacheVary.cs / 1 / HttpCacheVary.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* * Cache Vary class. Wraps Vary header * * Copyright (c) 1998 Microsoft Corporation */ namespace System.Web { using System.Text; using System.Runtime.InteropServices; using System.Web.Util; using System.Security.Permissions; ////// [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] public sealed class HttpCacheVaryByHeaders { bool _isModified; bool _varyStar; HttpDictionary _headers; internal HttpCacheVaryByHeaders() { Reset(); } internal void Reset() { _isModified = false; _varyStar = false; _headers = null; } /* * Reset based on the cached vary headers. */ internal void ResetFromHeaders(String[] headers) { int i, n; if (headers == null) { _isModified = false; _varyStar = false; _headers = null; } else { _isModified = true; if (headers[0].Equals("*")) { Debug.Assert(headers.Length == 1, "headers.Length == 1"); _varyStar = true; _headers = null; } else { _varyStar = false; _headers = new HttpDictionary(); for (i = 0, n = headers.Length; i < n; i++) { _headers.SetValue(headers[i], headers[i]); } } } } internal bool IsModified() { return _isModified; } /* * Construct header value string */ internal String ToHeaderString() { StringBuilder s; Object item; int i, n; if (_varyStar) { return "*"; } else if (_headers != null) { s = new StringBuilder(); for (i = 0, n = _headers.Size; i < n; i++) { item = _headers.GetValue(i); if (item != null) { HttpCachePolicy.AppendValueToHeader(s, (String)item); } } if (s.Length > 0) return s.ToString(); } return null; } /* * Returns the headers, for package access only. * * @return the headers. */ internal String[] GetHeaders() { String[] s = null; Object item; int i, j, c, n; if (_varyStar) { return new String[1] {"*"}; } else if (_headers != null) { n = _headers.Size; c = 0; for (i = 0; i < n; i++) { item = _headers.GetValue(i); if (item != null) { c++; } } if (c > 0) { s = new string[c]; j = 0; for (i = 0; i < n; i++) { item = _headers.GetValue(i); if (item != null) { s[j] = (String) item; j++; } } Debug.Assert(j == c, "j == c"); } } return s; } // // Public methods and properties // ///Indicates that a cache should contain multiple /// representations for a particular Uri. This class is an encapsulation that /// provides a rich, type-safe way to set the Vary header. ////// public void VaryByUnspecifiedParameters() { _isModified = true; _varyStar = true; _headers = null; } internal bool GetVaryByUnspecifiedParameters() { return _varyStar; } /* * Vary by accept types */ ///Sets the "Vary: *" header and causes all other Vary: /// header information to be dropped. ////// public bool AcceptTypes { get { return this["Accept"]; } set { _isModified = true; this["Accept"] = value; } } /* * Vary by accept language */ ///Retrieves or assigns a value indicating whether the cache should vary by Accept types. This causes the /// Vary: header to include an Accept field. ////// public bool UserLanguage { get { return this["Accept-Language"]; } set { _isModified = true; this["Accept-Language"] = value; } } /* * Vary by user agent */ ///Retrieves or assigns a Boolean value indicating whether /// the cache should vary by user language. ////// public bool UserAgent { get { return this["User-Agent"]; } set { _isModified = true; this["User-Agent"] = value; } } /* * Vary by charset */ ///Retrieves or assigns a Boolean value indicating whether /// the cache should vary by user agent. ////// public bool UserCharSet { get { return this["Accept-Charset"]; } set { _isModified = true; this["Accept-Charset"] = value; } } /* * Vary by a given header */ ///Retrieves or assigns a value indicating whether the /// cache should vary by browser character set. ////// public bool this[String header] { get { if (header == null) { throw new ArgumentNullException("header"); } if (header.Equals("*")) { return _varyStar; } else { return (_headers != null && _headers.GetValue(header) != null); } } set { if (header == null) { throw new ArgumentNullException("header"); } /* * Since adding a Vary header is more restrictive, we don't * want components to be able to set a Vary header to false * if another component has set it to true. */ if (value == false) { return; } _isModified = true; if (header.Equals("*")) { VaryByUnspecifiedParameters(); } else { // set value to header if true or null if false if (!_varyStar) { if (_headers == null) { _headers = new HttpDictionary(); } _headers.SetValue(header, header); } } } } } }Default property. /// Indexed property indicating that a cache should (or should not) vary according /// to a custom header. ///
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