/// <summary>
/// Produces a formatted string as specified by the conversion pattern.
/// </summary>
/// <param name="writer">The TextWriter to write the formatted event to</param>
/// <remarks>
/// <para>
/// Format the pattern to the <paramref name="writer"/>.
/// </para>
/// </remarks>
public void Format(TextWriter writer)
{
if (writer == null)
{
throw new ArgumentNullException("writer");
}
PatternConverter c = m_head;
// loop through the chain of pattern converters
while (c != null)
{
c.Format(writer, null);
c = c.Next;
}
}
/// <summary>
/// Resets the internal state of the parser and adds the specified pattern converter
/// to the chain.
/// </summary>
/// <param name="pc">The pattern converter to add.</param>
private void AddConverter(PatternConverter pc)
{
// Add the pattern converter to the list.
if (m_head == null)
{
m_head = m_tail = pc;
}
else
{
// Set the next converter on the tail
// Update the tail reference
// note that a converter may combine the 'next' into itself
// and therefore the tail would not change!
m_tail = m_tail.SetNext(pc);
}
}
/// <summary>
/// Process a parsed converter pattern
/// </summary>
/// <param name="converterName">the name of the converter</param>
/// <param name="option">the optional option for the converter</param>
/// <param name="formattingInfo">the formatting info for the converter</param>
private void ProcessConverter(string converterName, string option, FormattingInfo formattingInfo)
{
LogLog.Trace("PatternParser: Converter [" + converterName + "] Option [" + option + "] Format [min=" + formattingInfo.Min + ",max=" + formattingInfo.Max + ",leftAlign=" + formattingInfo.LeftAlign + "]");
// Lookup the converter type
Type converterType = (Type)m_patternConverters[converterName];
if (converterType == null)
{
LogLog.Error("PatternParser: Unknown converter name [" + converterName + "] in conversion pattern.");
}
else
{
// Create the pattern converter
PatternConverter pc = null;
try
{
pc = (PatternConverter)Activator.CreateInstance(converterType);
// formattingInfo variable is an instance variable, occasionally reset
// and used over and over again
pc.FormattingInfo = formattingInfo;
pc.Option = option;
IOptionHandler optionHandler = pc as IOptionHandler;
if (optionHandler != null)
{
optionHandler.ActivateOptions();
}
AddConverter(pc);
}
catch (Exception createInstanceEx)
{
LogLog.Error("PatternParser: Failed to create instance of Type [" + converterType.FullName + "] using default constructor. Exception: " + createInstanceEx.ToString());
}
}
}
/// <summary>
/// Set the next pattern converter in the chains
/// </summary>
/// <param name="patternConverter">the pattern converter that should follow this converter in the chain</param>
/// <returns>the next converter</returns>
/// <remarks>
/// <para>
/// The PatternConverter can merge with its neighbor during this method (or a sub class).
/// Therefore the return value may or may not be the value of the argument passed in.
/// </para>
/// </remarks>
public virtual PatternConverter SetNext(PatternConverter patternConverter)
{
m_next = patternConverter;
return(m_next);
}
/// <summary>
/// Initialize object options
/// </summary>
/// <remarks>
/// <para>
/// This is part of the <see cref="IOptionHandler"/> delayed object
/// activation scheme. The <see cref="ActivateOptions"/> method must
/// be called on this object after the configuration properties have
/// been set. Until <see cref="ActivateOptions"/> is called this
/// object is in an undefined state and must not be used.
/// </para>
/// <para>
/// If any of the configuration properties are modified then
/// <see cref="ActivateOptions"/> must be called again.
/// </para>
/// </remarks>
virtual public void ActivateOptions()
{
m_head = CreatePatternParser(m_pattern).Parse();
}