/// <summary>
/// Handles the computation internally, i.e. calls dependencies, creates output, manages delays, etc
/// </summary>
/// <param name="transformationRule">The transformation rule</param>
/// <param name="input">The input elements for this computation</param>
/// <param name="context">The transformation context</param>
/// <param name="computations">The computations for the input</param>
/// <param name="originalTransformationRule">The transformation rule of the original call</param>
/// <param name="comp">The computation</param>
/// <param name="compCon">The computation context</param>
private void HandleComputation(GeneralTransformationRule transformationRule, object[] input, IEnumerable context, List <ITraceEntry> computations, GeneralTransformationRule originalTransformationRule, Computation comp, ComputationContext compCon)
{
// The transformation output is only generated when we are handling the base transformation rule,
// because this is always required
if (compCon.IsDelayed)
{
Stack <Computation> dependantComputes = new Stack <Computation>();
var ruleStack = Transformation.ComputeInstantiatingTransformationRulePath(comp);
if (transformationRule != originalTransformationRule)
{
ReorderStack(originalTransformationRule, comp, ruleStack);
}
var delayLevel = comp.Context.MinOutputDelayLevel;
var computes = new List <Computation>();
Computation lastComp = null;
while (ruleStack.Count > 0)
{
var rule = ruleStack.Pop();
var comp2 = FindOrCreateDependentComputation(input, computations, comp, dependantComputes, rule);
// in case comp2 is not yet handled, a delay does not yet exist and thus
// DelayLevel < minDelayLevel
delayLevel = Math.Max(delayLevel, Math.Max(comp2.OutputDelayLevel, comp2.Context.MinOutputDelayLevel));
if (lastComp != null)
{
lastComp.SetBaseComputation(comp2);
}
lastComp = comp2;
computes.Add(comp2);
}
// delay the call of dependencies
// this prevents the issue arising from computations calling their parents that come later in the stack
foreach (var comp2 in dependantComputes)
{
CallDependencies(comp2, true);
}
if (delayLevel <= currentOutputDelay)
{
var createRule = computes[0];
// Generate the output
var output = createRule.CreateOutput(context);
for (int i = computes.Count - 1; i >= 0; i--)
{
computes[i].InitializeOutput(output);
}
if (callTransformations)
{
for (int i = computes.Count - 1; i >= 0; i--)
{
computes[i].Transform();
}
}
}
else
{
//Save computations into Delay
Delay(delayLevel, computes, context);
}
if (!callTransformations)
{
for (int i = computes.Count - 1; i >= 0; i--)
{
AddToComputationOrder(computes[i], currentTransformationDelay);
}
}
for (int i = computes.Count - 1; i >= 0; i--)
{
dependencyCallQueue.Enqueue(computes[i]);
}
}
}