internal static bool Record(ChangeSet owner, Root root, Relation rel, Item item1, Item item2, Dictionary <Relation, Dictionary <Item, List <Item> > > history)
{
#region track/check the history ==================================
// Avoid attempts to unlink the same relationship multiple times,
// also update the historic record.
List <Item> items;
if (history.TryGetValue(rel, out Dictionary <Item, List <Item> > itemItems))
{ //======================================================================this relation has been here before
if (itemItems.TryGetValue(item1, out items))
{ //============================================the parent item has been here before
if (items.Contains(item2))
{
return(false); //and the child item has already been unlinked, so there is nothing to do
}
items.Add(item2); //===================update the historic record
}
else
{//============================================the parent item has not been here before
items = new List <Item>(2)
{
item2
};
itemItems.Add(item1, items);//=========update the historic record
}
}
else
{//======================================================================this relation has not been here before
itemItems = new Dictionary <Item, List <Item> >(4);
items = new List <Item>(2)
{
item2
};
itemItems.Add(item1, items);
history.Add(rel, itemItems);//=========update the historic record
}
#endregion
(int parentIndex, int childIndex) = rel.GetIndex(item1, item2);
if (parentIndex < 0 || childIndex < 0)
{
return(false); //appearently the relationship doesn't exists
}
var nam1 = item1.GetDoubleNameId(root);
var nam2 = item2.GetDoubleNameId(root);
var rnam = rel.GetNameId(root);
var name = $" [{rnam}] ({nam1}) --> ({nam2})";
new ItemUnLinked(owner, rel, item1, item2, parentIndex, childIndex, name);
return(true);
}
internal static bool Record(Root root, Relation rel, Item item1, Item item2)
{
(int parentIndex, int childIndex) = rel.GetIndex(item1, item2);
if (parentIndex < 0 || childIndex < 0)
{
return(false); //appearently the relationship doesn't exists
}
var nam1 = item1.GetDoubleNameId(root);
var nam2 = item2.GetDoubleNameId(root);
var rnam = rel.GetNameId(root);
var name = $" [{rnam}] ({nam1}) --> ({nam2})";
var ci = new ItemUnLinked(root.Get <ChangeRoot>().ChangeSet, rel, item1, item2, parentIndex, childIndex, name);
ci.DoNow();
return(true);
}