public bool Transfer(IContainerReference sourceContainer, IContainerReference targetContainer, IItem entity)
{
if (!containers.ContainsKey(sourceContainer))
{
return(false);
}
if (Equals(sourceContainer, targetContainer))
{
// nothing to do.
return(true);
}
if (CanAdd(targetContainer, entity))
{
if (Remove(sourceContainer, entity))
{
if (Add(targetContainer, entity))
{
return(true);
}
// try to restore the broken entity ..
if (!Add(sourceContainer, entity))
{
throw new Exception("Whoha!");
}
}
}
return(false);
}
// public List<IItem> Contents(IContainerReference container, List<IItem> collector)
// {
// if (!containers.TryGetValue(container, out Container c))
// {
// if (collector == null)
// {
// collector = new List<IItem>();
// }
// else
// {
// collector.Clear();
// }
//
// return collector;
// }
//
// return c.Contents(collector);
// }
public ReadOnlyListWrapper <IItem> Contents(IContainerReference container)
{
if (!containers.TryGetValue(container, out Container c))
{
return(EmptySingleton);
}
return(c.Contents());
}
public bool CanAdd(IContainerReference container, IItem entity)
{
if (!containers.TryGetValue(container, out Container c))
{
return(Container.CanAddPrecheck(container, entity));
}
return(c.CanAdd(entity));
}
public bool Remove(IContainerReference container, IItem entity)
{
if (!containers.TryGetValue(container, out Container c))
{
return(false);
}
var retval = c.Remove(entity);
itemParents.Remove(entity);
if (c.IsEmpty)
{
containers.Remove(container);
}
return(retval);
}
public bool Add(IContainerReference container, IItem entity)
{
if (ContainerOf(entity) != null)
{
throw new ArgumentException("This item is already part of an collection.");
}
if (!containers.TryGetValue(container, out Container c))
{
c = new Container(container);
c.Add(entity);
containers[container] = c;
itemParents[entity] = container;
}
else
{
c.Add(entity);
itemParents[entity] = container;
}
return(true);
}
public static bool CanAddPrecheck(IContainerReference id, IItem item)
{
return(id.ContainerType >= item.ItemType.Container);
}
public Container(IContainerReference id)
{
Id = id ?? throw new ArgumentNullException(nameof(id));
Items = new List <IItem>();
}
