/// <summary>
/// Determines whether this instance and a specified object are the same.
/// </summary>
/// <param name="obj"></param>
/// <returns>true if obj type is the same and they have same IDs;
/// otherwise, false.</returns>
///
public override bool Equals(object obj)
{
// Return false if obj is either null or if it is not of
// the same type as our instance.
//
RentedItem otherPrice = obj as RentedItem;
if (obj == null)
{
return(false);
}
// Two rented items are same if they belongs to the same customer
// and points to the same movie exemplar.
//
return(this.RentedTo == otherPrice.RentedTo &&
this.Exemplar == otherPrice.Exemplar);
}
/////////////////////////////////////////////////////////////////////////////////
#region [ Constructors ]
/// <summary>
/// Initializes a new (mutable) instance of the MovieExemplar class either as an
/// empty (without argument) or as a copy-constructed object from an existing
/// (immutable) instance from database.
/// See also <see cref="AddTo"/> and <see cref="Update"/> methods.
/// </summary>
/// <remarks>
/// The constructor does not insert or update database. To save changes to
/// database, use either <see cref="AddTo"/> method after construction without
/// original object, or <see cref="Update"/> method after copy-construction
/// from an existing original immutable object. Initially constructed objects
/// are all mutable until *saved to database*, after which they become immutable.
/// To modify immutable object one must copy-construct new instance and later
/// call <see cref="Update"/> to commit changes. This ensures transactioncal
/// change of all records and proper delivery of on-changed events to event
/// handlers.
/// </remarks>
///
public MovieExemplar(MovieExemplar original = null)
: base(original, "Movie Exemplar")
{
if (!IsNew) // get fields from original
{
this.ID = original.ID;
this.Movie = original.Movie;
this.SetFieldsFrom(BaseRecord);
this.RentedAsItem = BaseRecord.RentedAsItem;
}
else // initialize default fields
{
this.Movie = null;
this.Media = Media.DVD;
this.PriceClass = PriceClass.OlderMovie;
this.Released = DateTime.MinValue;
this.RentedAsItem = null;
}
}