public void Insert(string search, Item item, ref MergeResult result, int pos = 0)
{
TraversalOption nextStep = new TraversalOption(Label, search, pos);
switch (nextStep.option)
{
case TraversalOptions.Found:
if (!Items.Any(item1 => item1.ComparePath(item)))
{
Items.Add(item);
Results.Add(item);
result.ToBeMergedInto = Results;
result.NeedsMerge = true;
}
break;
case TraversalOptions.MoveNext:
if (NextNode == null)
{
NextNode = new SearchNode {
Label = search.Substring(pos)
};
NextNode.Items.Add(item);
NextNode.Results.Add(item);
result.ToBeMergedInto = NextNode.Results;
result.NeedsMerge = true;
}
else
{
NextNode.Insert(search, item, ref result, pos);
}
break;
case TraversalOptions.MoveDown:
if (ChildNode == null)
{
ChildNode = new SearchNode()
{
Label = search.Substring(pos + nextStep.commonPrefixLength),
Items = new List <Item>(),
};
ChildNode.Items.Add(item);
ChildNode.Results.Add(item);
result.ToBeMergedInto = ChildNode.Results;
result.NeedsMerge = true;
if (result.NeedsMerge)
{
result.NeedsMerge = Results.MergeIntoList(result.ToBeMergedInto) > 0;
result.ToBeMergedInto = Results;
}
}
else
{
ChildNode.Insert(search, item, ref result, pos + nextStep.commonPrefixLength);
if (result.NeedsMerge)
{
result.NeedsMerge = Results.MergeIntoList(result.ToBeMergedInto) > 0;
result.ToBeMergedInto = Results;
}
}
break;
case TraversalOptions.Split:
SearchNode newNode = new SearchNode
{
Label = Label.Substring(nextStep.commonPrefixLength),
Items = Items,
Results = Results,
ChildNode = ChildNode
};
Items = new List <Item>();
Results = new MergedResultList(newNode.ResultItems);
Label = Label.Substring(0, nextStep.commonPrefixLength);
ChildNode = newNode;
if (search.Length == nextStep.commonPrefixLength + pos)
{
Items.Add(item);
Results.Add(item);
}
else
{
SearchNode toInsert = new SearchNode
{
Label = search.Substring(nextStep.commonPrefixLength + pos),
Items = new List <Item> {
item
},
Results = new MergedResultList(new List <Item> {
item
})
};
Results.MergeIntoList(toInsert.Results);
newNode.NextNode = toInsert;
}
result.ToBeMergedInto = Results;
result.NeedsMerge = true;
break;
}
}
