/// <summary>
/// Initializes a new instance of the <see cref="LoggerAttribute"/> with an explicit logger name and <see cref="LoggerNamePolicy"/> for
/// any generic arguments of the class.
/// </summary>
/// <param name="name">The name of <see cref="ILog"/>.</param>
/// <param name="genericArgsNamePolicy">The <see cref="LoggerNamePolicy"/> to be used for any generic argument.</param>
/// <remarks>
/// The <paramref name="genericArgsNamePolicy"/> is a fall back policy. If any of the generic arguments types
/// owns its own <see cref="LoggerAttribute"/> it will be used.
/// </remarks>
public LoggerAttribute(string name, LoggerNamePolicy genericArgsNamePolicy)
: this(name)
{
m_genericArgsNamePolicy = genericArgsNamePolicy;
}
/// <summary>
/// Initializes a new instance of the <see cref="LoggerAttribute"/> with <see cref="LoggerNamePolicy"/> for
/// the type and any generic arguments.
/// </summary>
/// <param name="namePolicy">The <see cref="LoggerNamePolicy"/> to be used for the type.</param>
/// <param name="genericArgsNamePolicy">The <see cref="LoggerNamePolicy"/> to be used for any generic argument.</param>
/// <remarks>
/// The <paramref name="genericArgsNamePolicy"/> is a fall back policy. If any of the generic arguments types
/// owns its own <see cref="LoggerAttribute"/> it will be used.
/// </remarks>
public LoggerAttribute(LoggerNamePolicy namePolicy, LoggerNamePolicy genericArgsNamePolicy)
{
m_namePolicy = namePolicy;
m_genericArgsNamePolicy = genericArgsNamePolicy;
}
/// <summary>
/// Initializes a new instance of the <see cref="LoggerAttribute"/> with a <see cref="LoggerNamePolicy"/> for the class.
/// </summary>
/// <param name="namePolicy">The <see cref="LoggerNamePolicy"/> to be used.</param>
public LoggerAttribute(LoggerNamePolicy namePolicy)
{
m_namePolicy = namePolicy;
}
/// <summary>
/// Initializes a new instance of the <see cref="LoggerAttribute"/> with an explicit logger name for the class.
/// </summary>
/// <param name="name">The name of <see cref="ILog"/>.</param>
public LoggerAttribute(string name)
{
m_name = name;
m_genericArgsNamePolicy = LoggerHelper.DefaultLoggerNamePolicy;
}
private static void GetLoggerName(Type type, Func<Type, LoggerAttribute> attFunc, LoggerNamePolicy fallbackPolicy, StringBuilder nameAccumulator)
{
LoggerAttribute log = attFunc(type);
string loggerName = ApplyLoggerNamePolicy(type,
log != null ? log.Name : string.Empty,
log != null ? log.LoggerNamePolicy : fallbackPolicy);
nameAccumulator.Append(loggerName);
if (type.IsGenericType)
{
string delim = "<";
LoggerNamePolicy genericArgsPolicy = log != null ? log.GenericArgsNamePolicy : fallbackPolicy;
foreach (Type genericArg in type.GetGenericArguments())
{
//Check if the logger name for this type has already been registered.
string gerericTypeName;
if (sm_loggerNames.TryGetValue(genericArg, out gerericTypeName))
{
nameAccumulator.Append("<" + gerericTypeName + ">");
return;
}
nameAccumulator.Append(delim);
GetLoggerName(genericArg, (t) =>
{
LoggerAttribute[] atts = (LoggerAttribute[])t.GetCustomAttributes(typeof(LoggerAttribute), false);
return atts.Length > 0 ? atts[0] : null;
}
, genericArgsPolicy, nameAccumulator);
delim = ",";
}
nameAccumulator.Append(">");
}
}
private static string ApplyLoggerNamePolicy(Type type, string customName, LoggerNamePolicy policy)
{
if (!string.IsNullOrEmpty(customName))
{
return customName;
}
switch (policy)
{
case LoggerNamePolicy.TypeName: return type.Name;
case LoggerNamePolicy.FullTypeName: return type.FullName;
case LoggerNamePolicy.AssemblyQualifiedName: return type.AssemblyQualifiedName;
}
Debug.Fail("Unsupported LoggerNamePolicy type");
throw new ArgumentException("Unsupported LoggerNamePolicy type");
}
/// <summary>
/// Generates a name for <see cref="ILog"/> for specific <see cref="Type"/> and registeres this name for this type's
/// logger usage only. The name is generated according to the given logger name policies.
/// </summary>
/// <param name="type">The <see cref="Type"/> whose <see cref="ILog"/> name should be regsitered.</param>
/// <param name="loggerNamePolicy">The <see cref="LoggerNamePolicy"/> to be applied on the name of the class.</param>
/// <param name="genericArgsLoggerNamePolicy">The <see cref="LoggerNamePolicy"/> to be applied on the name of the generic arguments of class.</param>
/// <returns>The name of the <see cref="ILog"/>.</returns>
/// <remarks>
/// If <paramref name="type"/> has a <see cref="LoggerAttribute"/> attached to it, the logic within the attribute will override
/// <paramref name="loggerNamePolicy"/> and <paramref name="genericArgsLoggerNamePolicy"/> parameters.
/// </remarks>
public static string RegisterLogger(Type type,
LoggerNamePolicy loggerNamePolicy,
LoggerNamePolicy genericArgsLoggerNamePolicy)
{
if (type == null)
{
Debug.Fail("type == null");
throw new ArgumentNullException("type");
}
return RegisterLoggerInternal(type, (t) =>
{
LoggerAttribute[] atts = (LoggerAttribute[])t.GetCustomAttributes(typeof(LoggerAttribute), false);
LoggerAttribute log = atts.Length > 0 ? atts[0] : null;
//If the type contains its own LoggerAttribute, it will have the precedence.
return log ?? new LoggerAttribute(loggerNamePolicy, genericArgsLoggerNamePolicy);
});
}
