public bool RemoveMasterFully(string id)
{
if (Universal.instance.firstMst != null && isNumber(id)) // Checking whether we have student or not
{
if (Universal.instance.firstMst != Universal.instance.lastMst) //Checking if we have more than one student
{
if (Convert.ToUInt64(id) == Universal.instance.firstMst.info.id) //Means that we wanna delete the first Student
{
RowNode <Master> newfirstRowNode = new RowNode <Master>();
newfirstRowNode.info = Universal.instance.firstMst.next.info;
newfirstRowNode.next = Universal.instance.firstMst.next.next;
newfirstRowNode.nextRow = Universal.instance.firstMst.nextRow;
Universal.instance.firstMst = newfirstRowNode;
return(true);
}
else if (Convert.ToUInt64(id) == Universal.instance.lastMst.info.id)//Means that we wanna delete the last Student
{
RowNode <Master> newlasttRowNode = new RowNode <Master>();
if (Universal.instance.lastMst.next != null) // Checking if we have convertable node to RowNode
{
newlasttRowNode.info = Universal.instance.lastMst.next.info;
newlasttRowNode.next = Universal.instance.lastMst.next.next;
Universal.instance.lastMst = newlasttRowNode;
return(true);
}
else // Here we don't have convertable node to RowNode
{
RowNode <Master> lastMst = Universal.instance.lastMst;
while (lastMst.nextRow != null)
{
lastMst = lastMst.nextRow;
}
Universal.instance.lastMst = lastMst;
return(true);
}
}
else // Here we want to delete the students in which there are at the Middle Nodes
{
RowNode <Master> prev = new RowNode <Master>();
prev = SearchPrevMaster(id);
if (prev != null) //if the student exists
{
if (prev.nextRow != null) //Prev is RowNode
{
if (prev.nextRow.info.id == Convert.ToUInt64(id)) //Deleting node is nextRowNode
{
if (prev.nextRow.next != null) //if the deleting RowNode has nextNode
{
prev.nextRow.info = prev.nextRow.next.info;
prev.nextRow.next = prev.nextRow.next.next;
}
else //deleting RowNode doesn't have nextNode
{
prev.nextRow = prev.nextRow.nextRow;
}
}
else // Deleting node is nextNode
{
prev.next = prev.next.next;
}
}
else //Prev is not RowNode = Usual Node
{
prev.next = prev.next.next;
}
}
else // Student doesn't exist
{
return(false);
}
return(false);
}
}
else // We have just one student
{
Universal.instance.firstMst = null;
Universal.instance.lastMst = null;
return(true);
}
}
else
{
//Showing Errore that the insterted id is wrong
return(false);
}
//End of Method
}
public static RowNode <Manager> SearchPrevManager(string id)
{
/**
* Returning the previous Student of that id
**/
if (isNumber(id))
{
if (Universal.instance.firstMng.info.id > Convert.ToUInt64(id) || Universal.instance.firstMng.info.id + 9 < Convert.ToUInt64(id))
{
//Showing Error
return(null);
}
else
{
ulong subId = Convert.ToUInt64(id.Substring(0, 10));
RowNode <Manager> pstd = Universal.instance.firstMng;
if (pstd != null)
{
RowNode <Manager> mng = pstd;
while (subId > pstd.info.id / 10)
{
if (Convert.ToUInt64(id) == mng.nextRow.info.id)
{
return(mng);
}
pstd = pstd.nextRow;
}
if (subId < pstd.info.id / 10)
{
//Showing Error
return(null);
}
else
{
//Horizontal navigation
while (mng.next != null)
{
if (Convert.ToUInt64(id) == mng.next.info.id)
{
return(mng);
}
mng = mng.next as RowNode <Manager>;
}
//Showing Error
return(null);
}
}
else
{
//Showing Error
return(null);
}
}
}
else
{
return(null);
}
}