/// <summary>
/// Expand description
/// </summary>
/// <param name="levels">levels</param>
/// <param name="expandUnanswered">expandUnanswered</param>
public void Expand(int levels, bool expandUnanswered)
{
Debug.Assert(levels > 0);
if (levels <= 0)
{
return; // nothing to do -- unexpected
}
if (!expandUnanswered && !IsAnswered && !HasChildren)
{
return; // don't waste memory by pushing down unanswered values to the next level unnecessarily
}
if (_children == null)
{
// we may be expanding an Answered node or an Unanswered node here
if (IsAnswered)
{
_children = new ValueNodeList <T>(1);
// push current value down to first child
_children.PrepareForIndex(0);
(_children[0] as ValueNode <T>).Value = _value;
_value = default(T); // this node becomes unanswered
}
else // not answered
{
Debug.Assert(expandUnanswered);
_children = new ValueNodeList <T>();
}
--levels;
}
else
{
// children already exist
Debug.Assert(!IsAnswered);
}
if (levels == 0) // we're done;
{
return; // drop out of recursion
}
// recurse into child nodes
foreach (ValueNode <T> child in _children)
{
child.Expand(levels, expandUnanswered);
}
}
/// <summary>
/// ValueNode constructor
/// </summary>
/// <param name="value">value</param>
public ValueNode(T value)
{
_value = value;
_children = null;
}
/// <summary>
/// ValueNode constructor
/// </summary>
public ValueNode()
{
_value = default(T);
_children = null;
}
