/// -------------------------------------------------------------------
/// <summary>
/// This method read the data from a passed StreamReader and writes the
/// the data by dataset sections.
/// </summary>
/// <param name="file">
/// A StreamReader with dataSets of phone numbers
/// </param>
/// -------------------------------------------------------------------
private static void HandleData(StreamReader file)
{
// A link list that stores phone numbers.
var phoneList = new PhoneNumberList();
// A phone data type to hold the data from the phoneList.
PhoneData phone;
// Stores the number of datasets from the file.
int numberOFDataSets;
// Stores the number of phone number in a data set.
int numberOfPhoneNumbers;
if (int.TryParse(file.ReadLine(), out numberOFDataSets))
{
file.ReadLine();
for (int i = 0; i < numberOFDataSets; i++)
{
Console.WriteLine($"----- Dataset {i + 1} ----- \n");
if (int.TryParse(file.ReadLine(), out numberOfPhoneNumbers))
{
for (int j = 0; j < numberOfPhoneNumbers; j++)
{
phone = new PhoneData(PhoneLettersToNumbers.
FormatToPhoneNumber(file.ReadLine()));
phoneList.InsertByNumber(phone);
}
file.ReadLine();
phoneList.DisplayPhoneDups();
if (phoneList.HasDups())
{
Console.WriteLine("\nDisplayed by count:\n");
phoneList.DisplayByCount();
}
else
{
Console.WriteLine($"No duplicates.");
}
phoneList = new PhoneNumberList();
Console.WriteLine();
}
}
}
}
/// -------------------------------------------------------------------
/// <summary>
/// This method is used by the InsertByNumber method to find the
/// position to insert a PhoneData object.
/// </summary>
/// <param name="current"> The current node to be evaluated.</param>
/// <param name="previous">The node before the current node.</param>
/// <param name="phone"> PhoneData object to be compared to the current
/// node.</param>
/// -------------------------------------------------------------------
private void FindInsertPosition(ref ListNode current,
ref ListNode previous, ref PhoneData phone)
{
// A flag if the location to insert the node is found before
// getting to the end of the link list.
var found = false;
current = firstNode;
while (current != null && !found)
{
// Holds information from the Data variable in a ListNode when
// converted to a PhoneData from comparisons.
var currentData = current.Data as PhoneData;
if (currentData.ToString().CompareTo(phone.ToString()) >= 0)
{
found = true;
}
else
{
previous = current;
current = current.Next;
}
}
}
/// -------------------------------------------------------------------
/// <summary>
/// This inserts a PhoneData object into the link list.
/// </summary>
/// <remarks>
/// When this method is only used to insert a PhoneData objects. This
/// link list is become an ordered link list by phone number in ascending
/// lexicographical order. If a phone number is already in the list then
/// the number is not stored in the list instead the count in the
/// associated phone number is incremented.
/// </remarks>
/// <param name="phone">The PhoneData object to be inserted.</param>
/// -------------------------------------------------------------------
public void InsertByNumber(PhoneData phone)
{
// An iterator to track the current position in the link list.
// Needed to give the iterator a value to stop a compiler error.
ListNode current = new ListNode("");
// An iterator to track the position before the current iterator in
// the link list. Needed to give the iterator a value to stop a
// compiler error.
ListNode previous = new ListNode("");
// The new node to insert into the list.
ListNode newNode = new ListNode(phone);
if (IsEmpty())
{
InsertAtFront(phone);
}
else
{
FindInsertPosition(ref current, ref previous, ref phone);
InsertData(ref current, ref previous, ref newNode);
}
}