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//
// System.Web.HttpVaryByHeaders.cs
//
// Author:
// Chris Toshok (toshok@novell.com)
//
//
// Copyright (C) 2005 Novell, Inc (http://www.novell.com)
//
// 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.
//
using System.Collections;
using System.Security.Permissions;
namespace System.Web {
// CAS - no InheritanceDemand here as the class is sealed
[AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class HttpCacheVaryByHeaders {
/* I would have much rather seen this class just use the
* Hashtable, and have the getter/setters for the builtin
* fields just manipulate that Hashtable, but that doesn't
* appear to work in MS's implementation. If you do:
*
* vary_by_hdrs["User-Agent"] = true;
*
* then
*
* (vary_by_hdrs.UserAgent == true)
*
* will be false, which is completely counterintuitive
* and broken. The same holds true in reverse:
*
* vary_by_hdrs.UserAgent = true;
*
* does not mean
*
* vary_by_hdrs["User-Agent"] == true.
*/
bool vary_by_unspecified;
bool vary_by_accept;
bool vary_by_user_agent;
bool vary_by_user_charset;
bool vary_by_user_language;
Hashtable fields;
internal HttpCacheVaryByHeaders ()
{
/* the field names are meant to be case insensitive */
fields = new Hashtable(CaseInsensitiveHashCodeProvider.Default,
CaseInsensitiveComparer.Default);
}
internal string[] GetHeaderNames ()
{
string[] names;
if (vary_by_unspecified) {
names = new string[1];
names[0] = "*";
}
else {
int builtin_count = ((vary_by_accept ? 1 : 0)
+ (vary_by_user_agent ? 1 : 0)
+ (vary_by_user_charset ? 1 : 0)
+ (vary_by_user_language ? 1 : 0));
names = new string [fields.Count + builtin_count];
int i = 0;
if (vary_by_accept) names[i++] = "Accept";
if (vary_by_user_agent) names[i++] = "User-Agent";
if (vary_by_user_charset) names[i++] = "Accept-Charset";
if (vary_by_user_language) names[i++] = "Accept-Language";
fields.Keys.CopyTo (names, builtin_count);
}
return names;
}
public bool AcceptTypes {
get {
return vary_by_accept;
}
set {
vary_by_unspecified = false;
vary_by_accept = value;
}
}
public bool UserAgent {
get {
return vary_by_user_agent;
}
set {
vary_by_unspecified = false;
vary_by_user_agent = value;
}
}
public bool UserCharSet {
get {
return vary_by_user_charset;
}
set {
vary_by_unspecified = false;
vary_by_user_charset = value;
}
}
public bool UserLanguage {
get {
return vary_by_user_language;
}
set {
vary_by_unspecified = false;
vary_by_user_language = value;
}
}
public bool this [ string header ] {
get {
if (header == null)
throw new ArgumentNullException ();
return fields.Contains (header);
}
set {
if (header == null)
throw new ArgumentNullException ();
vary_by_unspecified = false;
if (value)
if (!fields.Contains (header))
fields.Add (header, true);
else
fields.Remove (header);
}
}
public void VaryByUnspecifiedParameters ()
{
fields.Clear();
vary_by_unspecified =
vary_by_accept =
vary_by_user_agent =
vary_by_user_charset =
vary_by_user_language = false;
vary_by_unspecified = true;
}
}
}
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