✨ Add helper methods for albums

diff --git a/src/main/kotlin/net/pterodactylus/sone/data/Albums.kt b/src/main/kotlin/net/pterodactylus/sone/data/Albums.kt
new file mode 100644 (file)
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--- /dev/null
+++ b/src/main/kotlin/net/pterodactylus/sone/data/Albums.kt
@@ -0,0 +1,23 @@
+/**
+ * Sone - Albums.kt - Copyright © 2019 David ‘Bombe’ Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sone.data
+
+/** Returns all images contained in this album and all its albums. */
+val Album.allImages: Collection<Image>
+       get() =
+               images + albums.flatMap { it.allImages }

diff --git a/src/test/kotlin/net/pterodactylus/sone/data/AlbumsTest.kt b/src/test/kotlin/net/pterodactylus/sone/data/AlbumsTest.kt
new file mode 100644 (file)
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+++ b/src/test/kotlin/net/pterodactylus/sone/data/AlbumsTest.kt
@@ -0,0 +1,48 @@
+/**
+ * Sone - AlbumsTest.kt - Copyright © 2019 David ‘Bombe’ Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sone.data
+
+import net.pterodactylus.sone.data.impl.*
+import org.hamcrest.MatcherAssert.*
+import org.hamcrest.Matchers.*
+import kotlin.test.*
+
+/**
+ * Unit test for various helper method in `Albums.kt`.
+ */
+class AlbumsTest {
+
+       @Test
+       fun `recursive list of all images for album is returned correctly`() {
+               val sone = IdOnlySone("sone")
+               val album = AlbumImpl(sone)
+               val firstNestedAlbum = AlbumImpl(sone)
+               val secondNestedAlbum = AlbumImpl(sone)
+               firstNestedAlbum.addImage(createImage(sone, "image-1"))
+               firstNestedAlbum.addImage(createImage(sone, "image-2"))
+               secondNestedAlbum.addImage(createImage(sone, "image-3"))
+               album.addImage(createImage(sone, "image-4"))
+               album.addAlbum(firstNestedAlbum)
+               album.addAlbum(secondNestedAlbum)
+               val images = album.allImages
+               assertThat(images.map(Image::id), containsInAnyOrder("image-1", "image-2", "image-3", "image-4"))
+       }
+
+       private fun createImage(sone: IdOnlySone, id: String) = ImageImpl(id).modify().setSone(sone).update()
+
+}