public override void Add(MemoComponent mc)
{
// We might want to prevent looping here ...
// since we can add any MemoComponent, we can
// add a composite A to composite B, and then
// composite B to A, making a loop between them
// printing them out, results in a infintie loop
// Maybe, a deep copy of the objects ???
try {
if (!Contains(mc) && !mc.Contains(this)) {
// This container does not have mc
// and mc does not contain this
// OK to add
this.items.Add(mc);
}
} catch (InvalidOperationException ex) {
// mc does not have the operation Contains
// so it must be a Memo, not a MemoList. OK to add
// Might want to log this ...
this.items.Add(mc);
}
}
public virtual void Remove(MemoComponent mc)
{
throw new System.NotSupportedException(
"Remove() not implemented for this class");
}
public virtual bool Contains(MemoComponent mc)
{
throw new System.NotSupportedException(
"Contains() not implemented for this class");
}
public override void Remove(MemoComponent mc)
{
this.items.Remove(mc);
}
public override bool Contains(MemoComponent m)
{
return this.items.Contains(m);
}