/// <summary>
/// Creates a thumbnail from the specified <see cref="Picture"/>.
/// If a thumbnail already exist, it doesn't change it and returns <c>False</c>; otherwise
/// it creates the thumbnail and returns <c>True</c>
/// </summary>
/// <returns><c>True</c> if the thumbnail is created; otherwise <c>False</c></returns>
public bool TryCreateThumbnail(Picture picture)
{
if (!this.HasThumbnail(picture)) { return false; }
else
{
this.UpdateThumbnail(picture);
return true;
}
}
/// <summary>
/// If the specified picture doesn't have a thumbnail, it creates it. Otherwise, throws an exception
/// </summary>
/// <param name="picture">The picture.</param>
/// <exception cref="BusinessLogicException">If the picture already has an exception</exception>
public void CreateThumbnail(Picture picture)
{
if (!this.HasThumbnail(picture)) { throw new ThumbnailSetException(); }
this.UpdateThumbnail(picture);
}
/// <summary>
/// Determines whether the specified picture has thumbnail.
/// </summary>
/// <param name="picture">The picture.</param>
/// <returns>
/// <c>true</c> if the specified picture has thumbnail; otherwise, <c>false</c>.
/// </returns>
public bool HasThumbnail(Picture picture)
{
return (picture.ThumbnailBitmap == null || picture.ThumbnailBitmap.Length == 0);
}
/// <summary>
/// Updates the thumbnail even if a thumbnail already exist.
/// </summary>
/// <param name="picture">The picture.</param>
public void UpdateThumbnail(Picture picture)
{
var img = Converter.ByteArrayToImage(picture.Bitmap);
var thumb = img.GetThumbnail();
picture.ThumbnailBitmap = thumb;
}