/// <summary>
/// “+”的重载，用于创建复合费用
/// </summary>
public static Cost operator +(Cost a, Cost b)
{
List <Cost> newElements = new List <Cost>();
if (a is MultipleCost)
{
if (b is MultipleCost)
{
newElements = ListUtils.Combine(((MultipleCost)a).Elements, ((MultipleCost)b).Elements);
}
else
{
newElements.AddRange(((MultipleCost)a).Elements);
newElements.Add(b);
}
}
else if (b is MultipleCost)
{
newElements.Add(a);
newElements.AddRange(((MultipleCost)b).Elements);
}
else
{
newElements.Add(a);
newElements.Add(b);
}
return(new MultipleCost(a.Reason, newElements.ToArray()));
}
public static Message operator +(Message a, Message b)
{
if (a is EmptyMessage || a == null)
{
return(b);
}
else if (b is EmptyMessage || b == null)
{
return(a);
}
else
{
List <Message> newElements = new List <Message>();
if (a is MultipleMessage)
{
if (b is MultipleMessage)
{
newElements = ListUtils.Combine(((MultipleMessage)a).Elements, ((MultipleMessage)b).Elements);
}
else
{
newElements.AddRange(((MultipleMessage)a).Elements);
newElements.Add(b);
}
}
else if (b is MultipleMessage)
{
newElements.Add(a);
newElements.AddRange(((MultipleMessage)b).Elements);
}
else
{
newElements.Add(a);
newElements.Add(b);
}
return(new MultipleMessage(newElements.ToArray()));
}
}
