/// <summary>
/// Adds the provided expense record to the database.
/// </summary>
/// <param name="record">The record to be added.</param>
/// <exception cref="ArgumentNullException">Thrown if no record has been provided.</exception>
/// <exception cref="InvalidOperationException">Thrown if the record to be added already exists in the database.</exception>
public void Create(ExpenseRecord record)
{
if (record == null)
{
throw new ArgumentNullException(nameof(record));
}
lock (this.database)
{
if (this.FindById(record.Id) != null)
{
throw new InvalidOperationException($"An expense record with ID {record.Id} already exists in the database!");
}
this.database.Add(record);
}
}
/// <summary>
/// Updates the provided expense record in the database.
/// </summary>
/// <param name="record">The record to be added.</param>
/// <exception cref="ArgumentNullException">Thrown if no record has been provided.</exception>
/// <exception cref="InvalidOperationException">Thrown if the record to be modified does not exist in the database.</exception>
public void Update(ExpenseRecord record)
{
if (record == null)
{
throw new ArgumentNullException(nameof(record));
}
lock (this.database)
{
var oldRecord = this.FindById(record.Id);
if (oldRecord == null)
{
throw new InvalidOperationException($"An expense record with ID {record.Id} does not exist in the database!");
}
oldRecord.Amount = record.Amount;
oldRecord.Date = record.Date;
oldRecord.Name = record.Name;
oldRecord.Reason = record.Reason;
oldRecord.Text = record.Text;
}
}
/// <summary>
/// Adds the provided expense record to the database.
/// </summary>
/// <param name="record">The record to be added.</param>
/// <exception cref="ArgumentNullException">Thrown if no record has been provided.</exception>
/// <exception cref="InvalidOperationException">Thrown if the record to be added already exists in the database.</exception>
public void Create(ExpenseRecord record)
{
// Exercise 5
// TODO
}
public void Update(ExpenseRecord record)
{
throw new NotImplementedException();
}
/// <summary>
/// Updates the provided expense record in the database.
/// </summary>
/// <param name="record">The record to be added.</param>
/// <exception cref="ArgumentNullException">Thrown if no record has been provided.</exception>
/// <exception cref="InvalidOperationException">Thrown if the record to be modified does not exist in the database.</exception>
public void Update(ExpenseRecord record)
{
// Exercise 4
// TODO
}