/// <summary>
/// Creates a batch instance over a single item
/// </summary>
/// <typeparam name="TKey">The type of the key.</typeparam>
/// <param name="definition">The definition.</param>
/// <param name="checkConditions">if set to <c>true</c> [check conditions].</param>
/// <returns></returns>
private IEnumerable <TagBatchInstance <TKey> > RunBatchInternal <TKey>(TagBatchDefinition <TKey> definition, bool checkConditions)
where TKey : class
{
AutoKeyedCollection <string, TagItemCollection> restLists = new AutoKeyedCollection <string, TagItemCollection>(StringComparer.OrdinalIgnoreCase);
AutoKeyedCollection <string, TagItemCollection> currentLists = new AutoKeyedCollection <string, TagItemCollection>(StringComparer.OrdinalIgnoreCase);
int nLeft = 0;
foreach (string itemName in definition.ItemsUsed)
{
TagItemCollection tt = Items.GetAllByName(itemName);
restLists.Add(tt);
currentLists.Add(tt.Clone(false));
nLeft += tt.Count;
}
// Create a list of valid items
IList <Pair <string, string> > constraints = definition.Constraints;
TagBatchInstance <TKey> instance = new TagBatchInstance <TKey>(this, definition);
do
{
string[] constraintValues = new string[constraints.Count];
for (int iList = 0; iList < restLists.Count; iList++)
{
TagItemCollection rest = restLists[iList];
TagItemCollection current = currentLists[iList];
string listName = restLists[iList].Name;
for (int iItem = 0; iItem < rest.Count; iItem++)
{
TagItem ti = rest[iItem];
int n = 0;
bool next = false;
foreach (Pair <string, string> p in constraints)
{
if (!string.IsNullOrEmpty(p.First) && !StringComparer.OrdinalIgnoreCase.Equals(p.First, listName))
{
continue;
}
string v = ti.ExpandedKey(p.Second);
if ((object)constraintValues[n] == null)
{
constraintValues[n++] = v;
}
else
if (!StringComparer.OrdinalIgnoreCase.Equals(v, constraintValues[n++]))
{
next = true;
break;
}
}
if (next)
{
continue;
}
else
{
rest.RemoveAt(iItem--);
current.Add(ti);
nLeft--;
}
}
}
// At least one item was added to current
instance.Fill(currentLists, constraintValues);
if (!checkConditions || instance.ConditionResult())
{
yield return(instance);
}
foreach (TagItemCollection current in currentLists)
{
current.Clear();
}
}while (nLeft > 0);
}