/// <summary>
/// Initializes a new instance of the <see cref="FileDescriptorRepository"/> class.
/// </summary>
public FileDescriptorRepository(String fileName, IEnumerable <Assembly> assemblies = null)
{
Assume.NotNull(fileName, nameof(fileName));
Assume.FileExists(fileName, nameof(fileName));
serializer = new DataContractJsonSerializer(typeof(DescriptorModel));
combinators = new List <CombinatorDescriptor>();
selectors = new List <SelectorDescriptor>();
modifiers = new List <ModifierDescriptor>();
commandDescriptors = new List <CommandDescriptor>();
predefinedAssemblies = new[] { Assembly.Load("mscorlib") };
this.assemblies = assemblies ?? new[] { Assembly.GetExecutingAssembly() };
loadFromFile(fileName);
}