private static void _distinct_internal <T>(this IOperationController controller, object key,
Func <T, T, IOperation> generateMergedOperation)
where T : class, IMergeableOperation
{
var operations = controller.Operations.ToList();
var mergeable = operations
.OfType <T>()
.Where(x => x.MergeJudge.GetMergeKey() == key)
.ToArray();
var first = mergeable.FirstOrDefault();
var last = mergeable.LastOrDefault();
if (first is null || last is null)
{
return;
}
var lastIndex = 0;
foreach (var operation in mergeable)
{
lastIndex = operations.IndexOf(operation);
operations.RemoveAt(lastIndex);
}
var newOperation = generateMergedOperation(first, last);
operations.Insert(lastIndex, newOperation);
controller.Flush();
operations.ForEach(x => controller.Push(x));
}