/// <summary>
/// Looks for methods marked with <see cref="NuGenWmHandlerAttribute"/> and initializes a message map
/// of type <see cref="NuGenWmHandlerList"/>.
/// </summary>
///
/// <param name="messageProcessor">
/// Specifies the methods marked with <see cref="NuGenWmHandlerAttribute"/> attribute(s)
/// to handle Windows messages.
/// </param>
///
/// <exception cref="ArgumentNullException">
/// <paramref name="messageProcessor"/> is <see langword="null"/>.
/// </exception>
///
/// <exception cref="NuGenWmHandlerSignatureException">
/// <paramref name="messageProcessor"/> provides a method marked with <see cref="NuGenWmHandlerAttribute"/>
/// but not compatible with the <see cref="NuGenWmHandler"/> delegate.
/// </exception>
public NuGenWmHandlerList BuildMessageMap(INuGenMessageProcessor messageProcessor)
{
if (messageProcessor == null)
{
throw new ArgumentNullException("messageProcessor");
}
NuGenWmHandlerList handlerList = new NuGenWmHandlerList();
MethodInfo[] methods = messageProcessor.GetType().GetMethods(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
for (int i = 0; i < methods.Length; i++)
{
MethodInfo method = methods[i];
object[] attributes = method.GetCustomAttributes(typeof(NuGenWmHandlerAttribute), false);
if (attributes != null)
{
foreach (NuGenWmHandlerAttribute attribute in attributes)
{
string methodName = method.Name;
NuGenWmHandler wmHandler = null;
try
{
wmHandler = (NuGenWmHandler)NuGenWmHandler.CreateDelegate(
typeof(NuGenWmHandler),
messageProcessor,
methodName,
false,
true
);
}
catch (ArgumentException)
{
throw new NuGenWmHandlerSignatureException(methodName);
}
handlerList.AddWmHandler(
attribute.WmId,
wmHandler
);
}
}
}
return(handlerList);
}
