/// <summary>
/// Registers a <see cref="Filter"/> to be invoked when <see cref="Filter.Name"/> matches .gitattributes 'filter=name'
/// </summary>
/// <param name="filter">The filter to be invoked at run time.</param>
/// <param name="priority">The priroty of the filter to invoked.
/// A value of 0 (<see cref="FilterRegistration.FilterPriorityMin"/>) will be run first on checkout and last on checkin.
/// A value of 200 (<see cref="FilterRegistration.FilterPriorityMax"/>) will be run last on checkout and first on checkin.
/// </param>
/// <returns>A <see cref="FilterRegistration"/> object used to manage the lifetime of the registration.</returns>
public static FilterRegistration RegisterFilter(Filter filter, int priority)
{
Ensure.ArgumentNotNull(filter, "filter");
if (priority < FilterRegistration.FilterPriorityMin || priority > FilterRegistration.FilterPriorityMax)
{
throw new ArgumentOutOfRangeException("priority",
priority,
String.Format(System.Globalization.CultureInfo.InvariantCulture,
"Filter priorities must be within the inclusive range of [{0}, {1}].",
FilterRegistration.FilterPriorityMin,
FilterRegistration.FilterPriorityMax));
}
FilterRegistration registration = null;
lock (registeredFilters)
{
// if the filter has already been registered
if (registeredFilters.ContainsKey(filter))
{
throw new EntryExistsException("The filter has already been registered.", GitErrorCode.Exists, GitErrorCategory.Filter);
}
// allocate the registration object
registration = new FilterRegistration(filter, priority);
// add the filter and registration object to the global tracking list
registeredFilters.Add(filter, registration);
}
return(registration);
}
/// <summary>
/// Takes a snapshot of the currently registered filters.
/// </summary>
/// <returns>An array of <see cref="FilterRegistration"/>.</returns>
public static IEnumerable <FilterRegistration> GetRegisteredFilters()
{
lock (registeredFilters)
{
FilterRegistration[] array = new FilterRegistration[registeredFilters.Count];
registeredFilters.Values.CopyTo(array, 0);
return(array);
}
}
/// <summary>
/// Unregisters the associated filter.
/// </summary>
/// <param name="registration">Registration object with an associated filter.</param>
public static void DeregisterFilter(FilterRegistration registration)
{
Ensure.ArgumentNotNull(registration, "registration");
lock (registeredFilters)
{
var filter = registration.Filter;
// do nothing if the filter isn't registered
if (registeredFilters.ContainsKey(filter))
{
// remove the register from the global tracking list
registeredFilters.Remove(filter);
// clean up native allocations
registration.Free();
}
}
}
