/////////////////////////////////////////////////////////////////////////////////
#region [ Constructors ]
/// <summary>
/// Initializes a new (mutable) instance of the Move 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 Movie(Movie original = null)
: base(original, "Movie")
{
if (!IsNew) // get fields from original
{
this.ID = BaseRecord.ID;
this.SetFieldsFrom(BaseRecord);
this.MovieExemplars = BaseRecord.MovieExemplars;
}
else // initialize default fields
{
this.FirstRelease = DateTime.MinValue;
this.Duration = TimeSpan.MinValue;
this.Genre = Genre.None;
// Add default relationships:
//
this.Actors = new List <MovieActor> ();
this.Directors = new List <string> ();
this.Writers = new List <string> ();
// Note: we should not instantiate this.MovieExemplars collection
// as we are still not connected to database. Instantiation is delayed
// until AddTo() is called.
//
this.MovieExemplars = null;
}
}
/////////////////////////////////////////////////////////////////////////////////
#region [ Public Methods ]
/// <summary>
/// Inserts newly created instance into database.
/// </summary>
///
public Movie AddTo(VideoRentalOutlet database)
{
VerifyAddTo(database);
Database = database;
ID = Database.NextMovieID;
this.MovieExemplars = new MovieExemplarCollection(this);
LockProperties(); // make record immutable
Database.Movies.Add(this);
return(this);
}
