/** Returns all images contained in this album and all its albums. */
val Album.allImages: Collection<Image>
get() =
- images + albums.flatMap { it.allImages }
+ images + albums.flatMap(Album::allImages)
/**
* Returns this album and all albums contained in this album (recursively).
val Album.allAlbums: List<Album>
get() =
listOf(this) + albums.flatMap(Album::allAlbums)
+
+@get:JvmName("notEmpty")
+val notEmpty: (Album) -> Boolean = { album ->
+ album.allImages.let { images ->
+ images.isNotEmpty() && images.any(Image::isInserted)
+ }
+}