From 0382e0afaa2bf1c193f4092a6468c99ff942df0c Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Sat, 16 Feb 2013 02:27:01 +0100
Subject: [PATCH] Add function to flatten an album and all albums beneath it.

---
 src/main/java/net/pterodactylus/sone/data/Album.java | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/main/java/net/pterodactylus/sone/data/Album.java b/src/main/java/net/pterodactylus/sone/data/Album.java
index 7103871..5375d98 100644
--- a/src/main/java/net/pterodactylus/sone/data/Album.java
+++ b/src/main/java/net/pterodactylus/sone/data/Album.java
@@ -32,6 +32,8 @@ import com.google.common.base.Function;
 import com.google.common.base.Optional;
 import com.google.common.base.Predicates;
 import com.google.common.collect.Collections2;
+import com.google.common.collect.FluentIterable;
+import com.google.common.collect.ImmutableList;
 import com.google.common.hash.Hasher;
 import com.google.common.hash.Hashing;
 
@@ -51,6 +53,20 @@ public class Album implements Fingerprintable {
 		}
 	};
 
+	/** Function that flattens the given album and all albums beneath it. */
+	public static final Function<Album, List<Album>> FLATTENER = new Function<Album, List<Album>>() {
+
+		@Override
+		public List<Album> apply(Album album) {
+			List<Album> albums = new ArrayList<Album>();
+			albums.add(album);
+			for (Album subAlbum : album.getAlbums()) {
+				albums.addAll(FluentIterable.from(ImmutableList.of(subAlbum)).transformAndConcat(FLATTENER).toList());
+			}
+			return albums;
+		}
+	};
+
 	/** The ID of this album. */
 	private final String id;
 
-- 
2.7.4