public ExperimentalFlag(
string name,
Guid namespaceId,
bool enabled = false,
IExperimentalFlag parentFlag = null
)
{
if (string.IsNullOrWhiteSpace(name))
{
throw new ArgumentNullException(nameof(name));
}
mParentFlag = parentFlag;
mGuid = GuidUtils.CreateNamed(namespaceId, name);
mName = name;
mEnabled = enabled;
}
private void RegisterPropertiesAndAliases()
{
PropertyInfo existingFlag;
var experimentsType = typeof(TExperiments);
var aliasProperties = new List <(PropertyInfo property, ExperimentalFlagAliasAttribute aliasAttribute)>();
var properties =
experimentsType.GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
var flagProperties = properties
.Where(property => typeof(IExperimentalFlag).IsAssignableFrom(property.PropertyType))
.ToList();
flagProperties.ForEach(
property =>
{
var aliasAttribute = property?.GetCustomAttribute <ExperimentalFlagAliasAttribute>(true);
if (aliasAttribute != null)
{
aliasProperties.Add((property, aliasAttribute));
return;
}
if (property?.DeclaringType == null)
{
throw new InvalidOperationException();
}
var flagName = property.Name.ToLowerInvariant();
var namespaceId = GetNamespaceIdFor(property.DeclaringType);
var flagId = GuidUtils.CreateNamed(namespaceId, property.Name);
if (TryGetProperty(flagName, out existingFlag))
{
throw new InvalidOperationException(
$@"Tried to add a flag with name '{flagName}' in '{property.DeclaringType?.FullName}' but there is already a flag with that name defined in '{existingFlag.DeclaringType?.FullName}'."
);
}
mFlagsById.Add(flagId, property);
mFlagsByName.Add(flagName, property);
}
);
aliasProperties.ForEach(
pair =>
{
var(property, aliasAttribute) = pair;
var aliasName = property.Name.ToLowerInvariant();
var targetName = aliasAttribute.Of;
var alias = new ExperimentalFlagAlias(this, targetName, aliasName);
property.SetValue(this, alias);
if (TryGetProperty(aliasName, out existingFlag))
{
throw new InvalidOperationException(
$@"Tried to add an alias with name '{aliasName}' in '{property.DeclaringType?.FullName}' but there is already a flag with that name defined in '{existingFlag.DeclaringType?.FullName}'."
);
}
mFlagsByName.Add(aliasName, property);
}
);
}
