/// <summary>
/// To the conversion
/// </summary>
/// <param name="loggingEvent">the event being logged</param>
/// <returns>the result of converting the pattern</returns>
override protected string Convert(LoggingEvent loggingEvent)
{
return loggingEvent.LookupMappedContext(m_key);
}
/// <summary>
/// Check if this filter should allow the event to be logged
/// </summary>
/// <remarks>
/// The <see cref="MDC"/> is matched against the <see cref="StringToMatch"/>.
/// If the <see cref="StringToMatch"/> occurs as a substring within
/// the message then a match will have occurred. If no match occurs
/// this function will return <see cref="FilterDecision.NEUTRAL"/>
/// allowing other filters to check the event. If a match occurs then
/// the value of <see cref="AcceptOnMatch"/> is checked. If it is
/// true then <see cref="FilterDecision.ACCEPT"/> is returned otherwise
/// <see cref="FilterDecision.DENY"/> is returned.
/// </remarks>
/// <param name="loggingEvent">the event being logged</param>
/// <returns>see remarks</returns>
override public FilterDecision Decide(LoggingEvent loggingEvent)
{
if (loggingEvent == null)
{
throw new ArgumentNullException("loggingEvent");
}
// Check if we have a key to lookup the MDC value with
if (m_key == null)
{
// We cannot filter so allow the filter chain
// to continue processing
return FilterDecision.NEUTRAL;
}
// Lookup the string to match in from the MDC using
// the key specified.
string msg = loggingEvent.LookupMappedContext(m_key);
// Check if we have been setup to filter
if (msg == null || (m_stringToMatch == null && m_regexToMatch == null))
{
// We cannot filter so allow the filter chain
// to continue processing
return FilterDecision.NEUTRAL;
}
// Firstly check if we are matching using a regex
if (m_regexToMatch != null)
{
// Check the regex
if (m_regexToMatch.Match(msg).Success == false)
{
// No match, continue processing
return FilterDecision.NEUTRAL;
}
// we've got a match
if (m_acceptOnMatch)
{
return FilterDecision.ACCEPT;
}
return FilterDecision.DENY;
}
else if (m_stringToMatch != null)
{
// Check substring match
if (msg.IndexOf(m_stringToMatch) == -1)
{
// No match, continue processing
return FilterDecision.NEUTRAL;
}
// we've got a match
if (m_acceptOnMatch)
{
return FilterDecision.ACCEPT;
}
return FilterDecision.DENY;
}
return FilterDecision.NEUTRAL;
}