/// <summary>
/// Adds a new contact to phonebook.
/// </summary>
/// <param name="contactName">Name of the contact.</param>
/// <param name="phoneNumbers">The phone numbers.</param>
/// <returns><c>true</c> if the specified key is found, <c>false</c> otherwise.</returns>
public bool AddPhone(string contactName, IEnumerable<string> phoneNumbers)
{
var nameToLower = contactName.ToLowerInvariant();
ContactNameComparator contactNameComparator;
var hasSpecifiedKey = !this.dictionary.TryGetValue(nameToLower, out contactNameComparator);
if (hasSpecifiedKey)
{
contactNameComparator = new ContactNameComparator
{
ContactName = contactName,
PhoneNumbers = new SortedSet<string>()
};
this.dictionary.Add(nameToLower, contactNameComparator);
this.sorted.Add(contactNameComparator);
}
foreach (var num in phoneNumbers)
{
this.multiDictionary.Add(num, contactNameComparator);
}
contactNameComparator.PhoneNumbers.UnionWith(phoneNumbers);
return hasSpecifiedKey;
}
/// <summary>
/// Lists the phonebook entries with paging.
/// </summary>
/// <param name="startIndex">The start index.</param>
/// <param name="count">The count.</param>
/// <returns>IEnumerable<ContactNameComparator>.</returns>
public IEnumerable<ContactNameComparator> ListEntries(int startIndex, int count)
{
if (startIndex < 0 || startIndex + count > this.dictionary.Count)
{
Console.WriteLine("Invalid start index or count.");
return null;
}
var list = new ContactNameComparator[count];
for (var i = startIndex; i <= startIndex + count - 1; i++)
{
var entry = this.sorted[i];
list[i - startIndex] = entry;
}
return list;
}
