/// <summary>
/// Checks whether the operator effects are relevant to the given target relative state.
/// </summary>
/// <param name="relativeState">Relative state for the application.</param>
/// <param name="operatorPreconditions">Operator preconditions.</param>
/// <returns>True if the operator effects are relevant to the given relative state, false otherwise.</returns>
public bool IsRelevant(IRelativeState relativeState, ISimpleConditions operatorPreconditions)
{
CashedVariablesCollector.Clear();
bool anyRelevant = false;
foreach (var effect in this)
{
var relevance = effect.IsRelevant(relativeState);
switch (relevance)
{
case EffectRelevance.ANTI_RELEVANT:
{
return(false);
}
case EffectRelevance.RELEVANT:
{
anyRelevant = true;
CashedVariablesCollector.Add(effect.GetAssignment().GetVariable());
break;
}
case EffectRelevance.IRRELEVANT:
{
if (effect.GetConditions() != null)
{
CashedVariablesCollector.Add(effect.GetAssignment().GetVariable());
}
break;
}
}
}
if (!anyRelevant)
{
return(false);
}
// additionally, the relative state has to be checked against operator preconditions ("hidden effects")
foreach (var constraint in operatorPreconditions)
{
int variable = constraint.GetVariable();
if (!CashedVariablesCollector.Contains(variable))
{
int value = relativeState.GetValue(variable);
if (value == RelativeState.WildCardValue)
{
continue;
}
if (value != constraint.GetValue())
{
return(false);
}
}
}
return(true);
}
/// <summary>
/// Checks whether the operator effect is relevant to the given target relative state.
/// </summary>
/// <param name="relativeState">Relative state.</param>
/// <returns>Effect relevance result.</returns>
public override EffectRelevance IsRelevant(IRelativeState relativeState)
{
var assignmentRelevance = base.IsRelevant(relativeState);
if (assignmentRelevance == EffectRelevance.RELEVANT)
{
foreach (var constraint in Conditions)
{
if (constraint.GetVariable() == Assignment.GetVariable())
{
continue;
}
int value = relativeState.GetValue(constraint.GetVariable());
if (value == RelativeState.WildCardValue)
{
continue;
}
if (constraint.GetValue() != value)
{
return(EffectRelevance.IRRELEVANT);
}
}
return(EffectRelevance.RELEVANT);
}
// conditional effect does not have to be used, so it should never be explicitly anti-relevant
return(EffectRelevance.IRRELEVANT);
}
/// <summary>
/// Checks whether the operator effect is relevant to the given target relative state.
/// </summary>
/// <param name="relativeState">Relative state.</param>
/// <returns>Effect relevance result.</returns>
public virtual EffectRelevance IsRelevant(IRelativeState relativeState)
{
int value = relativeState.GetValue(Assignment.GetVariable());
if (value == RelativeState.WildCardValue)
{
// not a conflict, but not positively contributing either
return(EffectRelevance.IRRELEVANT);
}
return((Assignment.GetValue() == value) ? EffectRelevance.RELEVANT : EffectRelevance.ANTI_RELEVANT);
}