/// <summary>
/// Is Dominated
/// </summary>
public bool IsDominated(ObjectiveItem <T> other)
{
if (ReferenceEquals(this, other))
{
return(false);
}
else if (null == other)
{
return(false);
}
else if (!ReferenceEquals(Owner, other.Owner))
{
return(false);
}
foreach (var description in Owner.ObjectiveDescriptions)
{
double v1 = this.ObjectiveValue(description);
double v2 = other.ObjectiveValue(description);
if (v2 > v1 && description.Goal == ObjectiveGoal.Min)
{
return(false);
}
if (v2 < v1 && description.Goal == ObjectiveGoal.Max)
{
return(false);
}
}
return(true);
}
/// <summary>
/// Dominance:
/// +1: left dominates right
/// 0: left and right are not comparable
/// -1: right dominates left
/// </summary>
public static int Dominance(ObjectiveItem <T> left, ObjectiveItem <T> right)
{
if (ReferenceEquals(left, right))
{
return(0);
}
else if (null == left)
{
return(-1);
}
else if (null == right)
{
return(1);
}
else if (!ReferenceEquals(left.Owner, right.Owner))
{
return(0);
}
bool canBeBetter = true;
bool canBeWorse = true;
foreach (var description in left.Owner.ObjectiveDescriptions)
{
double v1 = left.ObjectiveValue(description);
double v2 = right.ObjectiveValue(description);
if (v1 > v2 && description.Goal == ObjectiveGoal.Min)
{
canBeBetter = false;
}
else if (v1 < v2 && description.Goal == ObjectiveGoal.Max)
{
canBeBetter = false;
}
if (v2 > v1 && description.Goal == ObjectiveGoal.Min)
{
canBeWorse = false;
}
else if (v2 < v1 && description.Goal == ObjectiveGoal.Max)
{
canBeWorse = false;
}
if (!canBeBetter && !canBeWorse)
{
return(0);
}
}
if (canBeBetter)
{
return(1);
}
else if (canBeWorse)
{
return(-1);
}
return(0);
}