/// <summary>
/// Applies the effect backwards to the given conditions.
/// </summary>
/// <param name="conditions">Conditions.</param>
public override IConditions ApplyBackwards(IConditions conditions)
{
if (IsRelevant(conditions) == EffectRelevance.RELEVANT)
{
IConditions newConditions = (IConditions)conditions.Clone();
newConditions.RemoveConstraint(Assignment);
newConditions = newConditions.ConjunctionWith(Conditions);
return(conditions.DisjunctionWith(newConditions));
}
return(conditions);
}
/// <summary>
/// Creates a disjunction of the current conditions and the specified other conditions.
/// </summary>
/// <param name="other">Other conditions.</param>
/// <returns>Disjunction of the current conditions and the given other conditions.</returns>
public IConditions DisjunctionWith(IConditions other)
{
if (Count == 0)
{
// empty conditions always evaluate as true, so any disjunction with this conditions
// would also be a tautology -> we don't create a clause in this case and just return
return((IConditions)Clone());
}
if (other is ConditionsClause || other is ConditionsContradiction)
{
return(other.DisjunctionWith(this));
}
Debug.Assert(other is Conditions);
return(new ConditionsClause((Conditions)Clone(), (Conditions)other.Clone()));
}