From 7c3ff19e96a5dcd31c2530f8d69ff1e5ccb33ca3 Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Mon, 14 Oct 2013 06:23:30 +0200
Subject: [PATCH] Add method to get child albums of an album to AlbumProvider.

---
 .../pterodactylus/sone/database/AlbumProvider.java  |  4 ++++
 .../sone/database/memory/MemoryDatabase.java        | 21 +++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/src/main/java/net/pterodactylus/sone/database/AlbumProvider.java b/src/main/java/net/pterodactylus/sone/database/AlbumProvider.java
index b83b179..c035623 100644
--- a/src/main/java/net/pterodactylus/sone/database/AlbumProvider.java
+++ b/src/main/java/net/pterodactylus/sone/database/AlbumProvider.java
@@ -17,6 +17,8 @@
 
 package net.pterodactylus.sone.database;
 
+import java.util.List;
+
 import net.pterodactylus.sone.data.Album;
 
 import com.google.common.base.Optional;
@@ -38,4 +40,6 @@ public interface AlbumProvider {
 	 */
 	Optional<Album> getAlbum(String albumId);
 
+	List<Album> getAlbums(Album parent);
+
 }
diff --git a/src/main/java/net/pterodactylus/sone/database/memory/MemoryDatabase.java b/src/main/java/net/pterodactylus/sone/database/memory/MemoryDatabase.java
index 4437baf..451be3a 100644
--- a/src/main/java/net/pterodactylus/sone/database/memory/MemoryDatabase.java
+++ b/src/main/java/net/pterodactylus/sone/database/memory/MemoryDatabase.java
@@ -21,6 +21,7 @@ import static com.google.common.base.Optional.fromNullable;
 import static com.google.common.base.Preconditions.checkNotNull;
 import static com.google.common.base.Predicates.not;
 import static com.google.common.collect.FluentIterable.from;
+import static java.util.Collections.emptyList;
 import static net.pterodactylus.sone.data.Sone.LOCAL_SONE_FILTER;
 
 import java.util.ArrayList;
@@ -52,6 +53,7 @@ import net.pterodactylus.sone.database.SoneBuilder;
 import net.pterodactylus.util.config.Configuration;
 import net.pterodactylus.util.config.ConfigurationException;
 
+import com.google.common.base.Function;
 import com.google.common.base.Optional;
 import com.google.common.collect.ArrayListMultimap;
 import com.google.common.collect.ListMultimap;
@@ -480,6 +482,16 @@ public class MemoryDatabase extends AbstractService implements Database {
 		}
 	}
 
+	@Override
+	public List<Album> getAlbums(Album parent) {
+		lock.readLock().lock();
+		try {
+			return from(albumChildren.get(parent.getId())).transformAndConcat(getAlbum()).toList();
+		} finally {
+			lock.readLock().unlock();
+		}
+	}
+
 	//
 	// ALBUMSTORE METHODS
 	//
@@ -846,4 +858,13 @@ public class MemoryDatabase extends AbstractService implements Database {
 		}
 	}
 
+	private Function<String, Iterable<Album>> getAlbum() {
+		return new Function<String, Iterable<Album>>() {
+			@Override
+			public Iterable<Album> apply(String input) {
+				return (input == null) ? Collections.<Album>emptyList() : getAlbum(input).asSet();
+			}
+		};
+	}
+
 }
-- 
2.7.4