From b2d80d0a83f7cd3880e18349bea3ea102389c316 Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Fri, 5 Jul 2013 20:57:59 +0200
Subject: [PATCH] Add filter for empty albums.

---
 src/main/java/net/pterodactylus/sone/data/Album.java | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/main/java/net/pterodactylus/sone/data/Album.java b/src/main/java/net/pterodactylus/sone/data/Album.java
index 5375d98..cb7b4f3 100644
--- a/src/main/java/net/pterodactylus/sone/data/Album.java
+++ b/src/main/java/net/pterodactylus/sone/data/Album.java
@@ -20,6 +20,7 @@ package net.pterodactylus.sone.data;
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
 import static com.google.common.base.Preconditions.checkState;
+import static java.util.Arrays.asList;
 
 import java.util.ArrayList;
 import java.util.Comparator;
@@ -30,6 +31,7 @@ import java.util.UUID;
 
 import com.google.common.base.Function;
 import com.google.common.base.Optional;
+import com.google.common.base.Predicate;
 import com.google.common.base.Predicates;
 import com.google.common.collect.Collections2;
 import com.google.common.collect.FluentIterable;
@@ -67,6 +69,24 @@ public class Album implements Fingerprintable {
 		}
 	};
 
+	/**
+	 * Filter that removes all albums that do not have any images in any album
+	 * below it.
+	 */
+	public static final Predicate<Album> NOT_EMPTY = new Predicate<Album>() {
+
+		@Override
+		public boolean apply(Album album) {
+			return FluentIterable.from(asList(album)).transformAndConcat(FLATTENER).anyMatch(new Predicate<Album>() {
+
+				@Override
+				public boolean apply(Album album) {
+					return !album.getImages().isEmpty();
+				}
+			});
+		}
+	};
+
 	/** The ID of this album. */
 	private final String id;
 
-- 
2.7.4