/// <summary>
/// Constructor allows to intialize ContactRecord fields with Contact DTO object
/// </summary>
/// <param name="contact">Contact object</param>
public ContactRecord(Contact contact)
{
Id = contact.Id;
Owner = contact.Owner;
FirstName = contact.FirstName;
LastName = contact.LastName;
Type = contact.Type;
Number = contact.Number;
}
/// <summary>
/// Implementation of IPhoneBookRepository.AddContact(contact) which adds contact to database
/// </summary>
/// <param name="contact">Contact object to be added</param>
/// <returns>Unique contact identifier</returns>
public int AddContact(Contact contact)
{
if (contact == null || contact.Id != 0 || !IsContactConsistent(contact)) return 0;
using (var db = GetPhoneBookContextInstance())
{
contact.Owner = Owner;
var contactRecord = new ContactRecord(contact);
db.Contacts.Add(contactRecord);
db.SaveChanges();
contact.Id = contactRecord.Id;
return contact.Id;
}
}
public bool UpdateContact(Contact contact)
{
return Repository.UpdateContact(contact);
}
public bool RemoveContact(Contact contact)
{
return Repository.RemoveContact(contact);
}
public int AddContact(Contact contact)
{
return Repository.AddContact(contact);
}
/// <summary>
/// Implementation of IPhoneBookRepository.UpdateContact(contact) which updates existing in database contact
/// </summary>
/// <param name="contact">Existing contact object to be updated</param>
/// <returns>True if contact was updated, false otherwise</returns>
public bool UpdateContact(Contact contact)
{
if (contact == null || contact.Id == 0 || !IsContactConsistent(contact)) return false;
using (var db = GetPhoneBookContextInstance())
{
contact.Owner = Owner;
var contactRecordToEdit = db.Contacts.Find(contact.Id);
if (!IsRecordOwner(contactRecordToEdit)) return false;
contactRecordToEdit.FirstName = contact.FirstName;
contactRecordToEdit.LastName = contact.LastName;
contactRecordToEdit.Type = contact.Type;
contactRecordToEdit.Number = contact.Number;
db.SaveChanges();
return true;
}
}
/// <summary>
/// Implementation of IPhoneBookRepository.RemoveContact(contact) which removes contact if it exists in database
/// </summary>
/// <param name="contact">Existing contact object to be removed</param>
/// <returns>True if contact was removed, false otherwise</returns>
public bool RemoveContact(Contact contact)
{
if (contact == null || contact.Id == 0 || !IsContactConsistent(contact)) return false;
using (var db = GetPhoneBookContextInstance())
{
var contactRecordToRemove = db.Contacts.Find(contact.Id);
if (!IsRecordOwner(contactRecordToRemove)) return false;
db.Contacts.Remove(contactRecordToRemove);
db.SaveChanges();
return true;
}
}
/// <summary>
/// Method checks if contact object is consistent with repository context
/// </summary>
/// <param name="contact">Contact object</param>
/// <returns>True if contact data is consistent, false otherwise</returns>
/// <remarks>Contact is consistent if its Owner guid is equal to repository owner guid or
/// if its owner property is not set (Guid.Empty) and there will be no database conflict
/// if contact was about to be added. Basically this method enforces authorization rules
/// allowing user with proper guid to manipulate database records</remarks>
public bool IsContactConsistent(Contact contact)
{
return contact != null && (contact.Owner == Guid.Empty || contact.Owner == Owner);
}
