public interface IPersistanceService<T> where T : new()
{
    string FilePath { get; set; }
    void Save(T settings);
    T Load(T settings);
}

public interface IPersistanceService<T> where T : new()
{
    void Save(T settings);
    T Load(T settings);
}

public interface IFilePersistanceService<T> : IPersistanceService<T> where T : new()
{
    string FilePath { get; set; }
}

public interface IRemotePersistanceService<T> : IPersistanceService<T> where T : new()
{
    Uri Location { get; set; }
}

    /// <summary>
    /// A <c>Dictionary&lt;ProjectId, Priority&gt;</c> that holds the order of a <see cref="Reference"/> for each <see cref="VBProject"/> that uses it.
    /// </summary>
    public class ReferencePriorityMap : Dictionary<int, int>
    {
        private readonly string _name;
        private readonly Guid _guid;

        public ReferencePriorityMap(string name, Guid guid)
        {
            _name = name;
            _guid = guid;
        }
    }

        private readonly HashSet<ReferencePriorityMap> _references = new HashSet<ReferencePriorityMap>();

        private void LoadComReferences(IEnumerable<VBProject> projects)
        {
            foreach (var vbProject in projects)
            {
                var projectId = vbProject.ProjectId();
                for (var priority = 0; priority < vbProject.References.Count; priority++)
                {
                    var reference = vbProject.References.Item(priority);
                    var referenceId = reference.ReferenceId();

public interface IRubberduckParser
{
    RubberduckParserState State { get; }
}