136 lines
4.5 KiB
C#
136 lines
4.5 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="HttpCacheVaryByContentEncodings.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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/*
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* HttpCacheVaryByContentEncodings
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*
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* Copyright (c) 1998 Microsoft Corporation
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*/
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namespace System.Web {
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using System.Text;
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using System.Runtime.InteropServices;
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using System.Web.Util;
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using System.Security.Permissions;
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/// <devdoc>
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/// <para>Provides a type-safe way to vary by Content-Encoding.</para>
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/// </devdoc>
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public sealed class HttpCacheVaryByContentEncodings {
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String[] _contentEncodings;
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bool _isModified;
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public HttpCacheVaryByContentEncodings() {
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Reset();
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}
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internal void Reset() {
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_isModified = false;
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_contentEncodings = null;
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}
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/*
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* Reset based on content encodings.
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*/
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internal void ResetFromContentEncodings(String[] contentEncodings) {
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Reset();
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if (contentEncodings != null) {
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_isModified = true;
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_contentEncodings = new String[contentEncodings.Length];
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for (int i = 0; i < contentEncodings.Length; i++) {
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_contentEncodings[i] = contentEncodings[i];
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}
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}
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}
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// the response is not cacheable if we're varying by content encoding
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// and the content-encoding header is not one of the encodings that we're
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// varying by
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internal bool IsCacheableEncoding(string coding) {
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// return true if we are not varying by content encoding.
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if (_contentEncodings == null) {
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return true;
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}
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// return true if there is no Content-Encoding header
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if (coding == null) {
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return true;
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}
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// return true if the Content-Encoding header is listed
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for (int i = 0; i < _contentEncodings.Length; i++) {
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if (_contentEncodings[i] == coding) {
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return true;
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}
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}
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// return false if the Content-Encoding header is not listed
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return false;
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}
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internal bool IsModified() {
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return _isModified;
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}
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internal String[] GetContentEncodings() {
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return _contentEncodings;
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}
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//
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// Public methods and properties
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//
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/// <devdoc>
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/// <para> Default property.
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/// Indexed property indicating that a cache should (or should not) vary according
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/// to a Content-Encoding.</para>
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/// </devdoc>
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public bool this[String contentEncoding]
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{
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get {
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if (String.IsNullOrEmpty(contentEncoding)) {
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throw new ArgumentNullException(SR.GetString(SR.Parameter_NullOrEmpty, "contentEncoding"));
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}
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if (_contentEncodings == null) {
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return false;
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}
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for(int i = 0; i < _contentEncodings.Length; i++) {
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if (_contentEncodings[i] == contentEncoding) {
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return true;
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}
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}
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return false;
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}
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set {
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if (String.IsNullOrEmpty(contentEncoding)) {
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throw new ArgumentNullException(SR.GetString(SR.Parameter_NullOrEmpty, "contentEncoding"));
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}
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// if someone enabled it, don't allow someone else to disable it.
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if (!value) {
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return;
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}
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_isModified = true;
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if (_contentEncodings != null) {
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string[] contentEncodings = new String[_contentEncodings.Length + 1];
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for (int i = 0; i < _contentEncodings.Length; i++) {
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contentEncodings[i] = _contentEncodings[i];
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}
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contentEncodings[contentEncodings.Length - 1] = contentEncoding;
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_contentEncodings = contentEncodings;
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return;
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}
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_contentEncodings = new String[1];
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_contentEncodings[0] = contentEncoding;
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}
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}
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}
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}
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