/// <summary>
/// this function used to do item extension , you provide two SIL about item a and b ,it return a SIL about (ab)
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
/// <returns></returns>
public static SparseIdList IStep(SparseIdList a, SparseIdList b)
{
SparseIdList sparseIdList = new SparseIdList(a.GetLength());
ListNode aNode, bNode;
for (int i = 0; i < a.GetLength(); i++)
{
aNode = a.GetElement(i, 0);
bNode = b.GetElement(i, 0);
while ((aNode != null) && (bNode != null))
{
if (aNode.GetSparseId == bNode.GetSparseId)
{
sparseIdList.AddElement(i, aNode.GetSparseId);
aNode = aNode.GetNext;
bNode = bNode.GetNext;
}
else if (aNode.GetSparseId > bNode.GetSparseId)
{
bNode = bNode.GetNext;
}
else
{
aNode = aNode.GetNext;
}
}
}
return(sparseIdList);
}
