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//
// EntityTagHeaderValue.cs
//
// Authors:
// Marek Safar <marek.safar@gmail.com>
//
// Copyright (C) 2011 Xamarin Inc (http://www.xamarin.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.Generic;
namespace System.Net.Http.Headers
{
public class EntityTagHeaderValue : ICloneable
{
static readonly EntityTagHeaderValue any = new EntityTagHeaderValue () { Tag = "*" };
public EntityTagHeaderValue (string tag)
{
Parser.Token.CheckQuotedString (tag);
Tag = tag;
}
public EntityTagHeaderValue (string tag, bool isWeak)
: this (tag)
{
IsWeak = isWeak;
}
internal EntityTagHeaderValue ()
{
}
public static EntityTagHeaderValue Any {
get {
return any;
}
}
public bool IsWeak { get; internal set; }
public string Tag { get; internal set; }
object ICloneable.Clone ()
{
return MemberwiseClone ();
}
public override bool Equals (object obj)
{
var source = obj as EntityTagHeaderValue;
return source != null && source.Tag == Tag &&
string.Equals (source.Tag, Tag, StringComparison.Ordinal);
}
public override int GetHashCode ()
{
return IsWeak.GetHashCode () ^ Tag.GetHashCode ();
}
public static EntityTagHeaderValue Parse (string input)
{
EntityTagHeaderValue value;
if (TryParse (input, out value))
return value;
throw new FormatException (input);
}
public static bool TryParse (string input, out EntityTagHeaderValue parsedValue)
{
var lexer = new Lexer (input);
Token token;
if (TryParseElement (lexer, out parsedValue, out token) && token == Token.Type.End)
return true;
parsedValue = null;
return false;
}
static bool TryParseElement (Lexer lexer, out EntityTagHeaderValue parsedValue, out Token t)
{
parsedValue = null;
t = lexer.Scan ();
bool is_weak = false;
if (t == Token.Type.Token) {
var s = lexer.GetStringValue (t);
if (s == "*") {
parsedValue = any;
t = lexer.Scan ();
return true;
}
if (s != "W" || lexer.PeekChar () != '/')
return false;
is_weak = true;
lexer.EatChar ();
t = lexer.Scan ();
}
if (t != Token.Type.QuotedString)
return false;
parsedValue = new EntityTagHeaderValue ();
parsedValue.Tag = lexer.GetStringValue (t);
parsedValue.IsWeak = is_weak;
t = lexer.Scan ();
return true;
}
internal static bool TryParse (string input, int minimalCount, out List<EntityTagHeaderValue> result)
{
return CollectionParser.TryParse (input, minimalCount, TryParseElement, out result);
}
public override string ToString ()
{
return IsWeak ?
"W/" + Tag :
Tag;
}
}
}
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