private RangeConditionHeaderValue(RangeConditionHeaderValue source)
{
Debug.Assert(source != null);
_entityTag = source._entityTag;
_date = source._date;
}
public static bool TryParse(string input, out RangeConditionHeaderValue parsedValue)
{
int index = 0;
object output;
parsedValue = null;
if (GenericHeaderParser.RangeConditionParser.TryParseValue(input, null, ref index, out output))
{
parsedValue = (RangeConditionHeaderValue)output;
return(true);
}
return(false);
}
public override bool Equals(object obj)
{
RangeConditionHeaderValue other = obj as RangeConditionHeaderValue;
if (other == null)
{
return(false);
}
if (_entityTag == null)
{
return((other._date != null) && (_date.Value == other._date.Value));
}
return(_entityTag.Equals(other._entityTag));
}
internal static int GetRangeConditionLength(string input, int startIndex, out object parsedValue)
{
Debug.Assert(startIndex >= 0);
parsedValue = null;
// Make sure we have at least 2 characters
if (string.IsNullOrEmpty(input) || (startIndex + 1 >= input.Length))
{
return(0);
}
int current = startIndex;
// Caller must remove leading whitespace.
DateTimeOffset date = DateTimeOffset.MinValue;
EntityTagHeaderValue entityTag = null;
// Entity tags are quoted strings optionally preceded by "W/". By looking at the first two character we
// can determine whether the string is en entity tag or a date.
char firstChar = input[current];
char secondChar = input[current + 1];
if ((firstChar == '\"') || (((firstChar == 'w') || (firstChar == 'W')) && (secondChar == '/')))
{
// trailing whitespace is removed by GetEntityTagLength()
int entityTagLength = EntityTagHeaderValue.GetEntityTagLength(input, current, out entityTag);
if (entityTagLength == 0)
{
return(0);
}
current = current + entityTagLength;
// RangeConditionHeaderValue only allows 1 value. There must be no delimiter/other chars after an
// entity tag.
if (current != input.Length)
{
return(0);
}
}
else
{
if (!HttpRuleParser.TryStringToDate(input.Substring(current), out date))
{
return(0);
}
// If we got a valid date, then the parser consumed the whole string (incl. trailing whitespace).
current = input.Length;
}
RangeConditionHeaderValue result = new RangeConditionHeaderValue();
if (entityTag == null)
{
result._date = date;
}
else
{
result._entityTag = entityTag;
}
parsedValue = result;
return(current - startIndex);
}