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//------------------------------------------------------------------------------
// <copyright file="HttpCacheParams.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
/*
* 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;
/// <devdoc>
/// <para>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.</para>
/// </devdoc>
public sealed class HttpCacheVaryByParams {
HttpDictionary _parameters;
int _ignoreParams;
bool _isModified;
bool _paramsStar;
public HttpCacheVaryByParams() {
Reset();
}
internal void Reset() {
_isModified = false;
_paramsStar = false;
_parameters = null;
_ignoreParams = -1;
}
/// <summary>
/// Set the Parameters in Cache Vary
/// </summary>
/// <param name="parameters"></param>
public void SetParams(string[] parameters) {
int i, n;
Reset();
if (parameters != null) {
_isModified = true;
if (parameters[0].Length == 0) {
Debug.Assert(parameters.Length == 1, "parameters.Length == 1");
IgnoreParams = true;
}
else if (parameters[0].Equals("*")) {
Debug.Assert(parameters.Length == 1, "parameters.Length == 1");
_paramsStar = true;
}
else {
_parameters = new HttpDictionary();
for (i = 0, n = parameters.Length; i < n; i++) {
_parameters.SetValue(parameters[i], parameters[i]);
}
}
}
}
internal bool IsModified() {
return _isModified;
}
internal bool AcceptsParams() {
return _ignoreParams == 1 || _paramsStar || _parameters != null;
}
/// <summary>
/// Get the Parameters in Cache Vary
/// </summary>
/// <returns></returns>
public string[] GetParams() {
string[] s = null;
Object item;
int i, j, c, n;
if (_ignoreParams == 1) {
s = new string[1] {string.Empty};
}
else if (_paramsStar) {
s = new string[1] {"*"};
}
else if (_parameters != null) {
n = _parameters.Size;
c = 0;
for (i = 0; i < n; i++) {
item = _parameters.GetValue(i);
if (item != null) {
c++;
}
}
if (c > 0) {
s = new string[c];
j = 0;
for (i = 0; i < n; i++) {
item = _parameters.GetValue(i);
if (item != null) {
s[j] = (string) item;
j++;
}
}
Debug.Assert(j == c, "j == c");
}
}
return s;
}
//
// Public methods and properties
//
/// <devdoc>
/// <para> Default property.
/// Indexed property indicating that a cache should (or should not) vary according
/// to a custom header.</para>
/// </devdoc>
public bool this[String header]
{
get {
if (header == null) {
throw new ArgumentNullException("header");
}
if (header.Length == 0) {
return _ignoreParams == 1;
}
else {
return _paramsStar ||
(_parameters != null && _parameters.GetValue(header) != null);
}
}
set {
if (header == null) {
throw new ArgumentNullException("header");
}
if (header.Length == 0) {
IgnoreParams = value;
}
/*
* Since adding a Vary parameter is more restrictive, we don't
* want components to be able to set a Vary parameter to false
* if another component has set it to true.
*/
else if (value) {
_isModified = true;
_ignoreParams = 0;
if (header.Equals("*")) {
_paramsStar = true;
_parameters = null;
}
else {
// set value to header if true or null if false
if (!_paramsStar) {
if (_parameters == null) {
_parameters = new HttpDictionary();
}
_parameters.SetValue(header, header);
}
}
}
}
}
public bool IgnoreParams {
get {
return _ignoreParams == 1;
}
set {
// Don't ignore if params have been added
if (_paramsStar || _parameters != null) {
return;
}
if (_ignoreParams == -1 || _ignoreParams == 1) {
_ignoreParams = value ? 1 : 0;
_isModified = true;
}
}
}
internal bool IsVaryByStar {
get {
return _paramsStar;
}
}
}
}
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