Add methods to reorder albums.

diff --git a/src/main/java/net/pterodactylus/sone/data/Album.java b/src/main/java/net/pterodactylus/sone/data/Album.java
index 941002e..d3bd6a4 100644 (file)
--- a/src/main/java/net/pterodactylus/sone/data/Album.java
+++ b/src/main/java/net/pterodactylus/sone/data/Album.java
@@ -152,6 +152,46 @@ public class Album implements Fingerprintable {
        }
 
        /**
+        * Moves the given album up in this album’s albums. If the album is already
+        * the first album, nothing happens.
+        *
+        * @param album
+        *            The album to move up
+        * @return The album that the given album swapped the place with, or
+        *         <code>null</code> if the album did not change its place
+        */
+       public Album moveAlbumUp(Album album) {
+               Validation.begin().isNotNull("Album", album).check().isEqual("Album Owner", album.sone, sone).isEqual("Album Parent", album.parent, this).check();
+               int oldIndex = albums.indexOf(album);
+               if (oldIndex <= 0) {
+                       return null;
+               }
+               albums.remove(oldIndex);
+               albums.add(oldIndex - 1, album);
+               return albums.get(oldIndex);
+       }
+
+       /**
+        * Moves the given album down in this album’s albums. If the album is
+        * already the last album, nothing happens.
+        *
+        * @param album
+        *            The album to move down
+        * @return The album that the given album swapped the place with, or
+        *         <code>null</code> if the album did not change its place
+        */
+       public Album moveAlbumDown(Album album) {
+               Validation.begin().isNotNull("Album", album).check().isEqual("Album Owner", album.sone, sone).isEqual("Album Parent", album.parent, this).check();
+               int oldIndex = albums.indexOf(album);
+               if ((oldIndex < 0) || (oldIndex >= (albums.size() - 1))) {
+                       return null;
+               }
+               albums.remove(oldIndex);
+               albums.add(oldIndex + 1, album);
+               return albums.get(oldIndex);
+       }
+
+       /**
         * Returns the images in this album.
         *
         * @return The images in this album