private void AppendStage(IResolveMiddleware stage)
{
var newDecl = new MiddlewareDeclaration(stage);
if (_last is null)
{
_first = _last = newDecl;
}
else
{
newDecl.Previous = _last;
_last.Next = newDecl;
_last = newDecl;
}
}
private void AddStage(IResolveMiddleware stage, MiddlewareInsertionMode insertionLocation)
{
VerifyPhase(stage.Phase);
// Start at the beginning.
var currentStage = _first;
var newStageDecl = new MiddlewareDeclaration(stage);
if (_first is null)
{
_first = _last = newStageDecl;
return;
}
while (currentStage is object)
{
if (insertionLocation == MiddlewareInsertionMode.StartOfPhase ? currentStage.Middleware.Phase >= stage.Phase : currentStage.Middleware.Phase > stage.Phase)
{
if (currentStage.Previous is object)
{
// Insert the node.
currentStage.Previous.Next = newStageDecl;
newStageDecl.Next = currentStage;
newStageDecl.Previous = currentStage.Previous;
currentStage.Previous = newStageDecl;
}
else
{
_first.Previous = newStageDecl;
newStageDecl.Next = _first;
_first = newStageDecl;
}
return;
}
currentStage = currentStage.Next;
}
// Add at the end.
newStageDecl.Previous = _last;
_last !.Next = newStageDecl;
_last = newStageDecl;
}
/// <inheritdoc/>
public IResolvePipelineBuilder UseRange(IEnumerable <IResolveMiddleware> stages, MiddlewareInsertionMode insertionMode = MiddlewareInsertionMode.EndOfPhase)
{
if (stages is null)
{
throw new ArgumentNullException(nameof(stages));
}
// Use multiple stages.
// Start at the beginning.
var currentStage = _first;
using var enumerator = stages.GetEnumerator();
if (!enumerator.MoveNext())
{
return(this);
}
var nextNewStage = enumerator.Current;
var lastPhase = nextNewStage.Phase;
VerifyPhase(nextNewStage.Phase);
while (currentStage is object)
{
if (insertionMode == MiddlewareInsertionMode.StartOfPhase ?
currentStage.Middleware.Phase >= nextNewStage.Phase :
currentStage.Middleware.Phase > nextNewStage.Phase)
{
var newDecl = new MiddlewareDeclaration(enumerator.Current);
if (currentStage.Previous is object)
{
// Insert the node.
currentStage.Previous.Next = newDecl;
newDecl.Next = currentStage;
newDecl.Previous = currentStage.Previous;
currentStage.Previous = newDecl;
}
else
{
_first !.Previous = newDecl;
newDecl.Next = _first;
_first = newDecl;
}
currentStage = newDecl;
if (!enumerator.MoveNext())
{
// Done.
return(this);
}
nextNewStage = enumerator.Current;
VerifyPhase(nextNewStage.Phase);
if (nextNewStage.Phase < lastPhase)
{
throw new InvalidOperationException(ResolvePipelineBuilderMessages.MiddlewareMustBeInPhaseOrder);
}
lastPhase = nextNewStage.Phase;
}
currentStage = currentStage.Next;
}
do
{
nextNewStage = enumerator.Current;
VerifyPhase(nextNewStage.Phase);
if (nextNewStage.Phase < lastPhase)
{
throw new InvalidOperationException(ResolvePipelineBuilderMessages.MiddlewareMustBeInPhaseOrder);
}
lastPhase = nextNewStage.Phase;
var newStageDecl = new MiddlewareDeclaration(nextNewStage);
if (_last is null)
{
_first = _last = newStageDecl;
}
else
{
newStageDecl.Previous = _last;
_last.Next = newStageDecl;
_last = newStageDecl;
}
}while (enumerator.MoveNext());
return(this);
}
