public virtual Item addDaughter(Item item)
{
Item newItem;
ItemContents itemContents;
Item p = getLastDaughter();
if (p != null)
{
newItem = p.appendItem(item);
}
else
{
if (item == null)
{
itemContents = new ItemContents();
}
else
{
itemContents = item.getSharedContents();
}
newItem = new Item(getOwnerRelation(), itemContents);
newItem.parent = this;
daughter = newItem;
}
return(newItem);
}
public virtual Item appendItem(Item originalItem)
{
ItemContents contents;
Item newItem;
if (originalItem == null)
{
contents = null;
}
else
{
contents = originalItem.getSharedContents();
}
newItem = new Item(getOwnerRelation(), contents);
newItem.next = next;
if (next != null)
{
next.prev = newItem;
}
attach(newItem);
if (ownerRelation.getTail() == this)
{
ownerRelation.setTail(newItem);
}
return(newItem);
}
public virtual Item prependItem(Item originalItem)
{
ItemContents contents;
Item newItem;
if (originalItem == null)
{
contents = null;
}
else
{
contents = originalItem.getSharedContents();
}
newItem = new Item(getOwnerRelation(), contents);
newItem.prev = prev;
if (prev != null)
{
prev.next = newItem;
}
newItem.next = this;
prev = newItem;
if (parent != null)
{
parent.daughter = newItem;
newItem.parent = parent;
parent = null;
}
if (ownerRelation.getHead() == this)
{
ownerRelation.setHead(newItem);
}
return(newItem);
}
public Item(Relation relation, ItemContents sharedContents)
{
ownerRelation = relation;
if (sharedContents != null)
{
contents = sharedContents;
}
else
{
contents = new ItemContents();
}
parent = null;
daughter = null;
next = null;
prev = null;
getSharedContents().addItemRelation(relation.getName(), this);
}