+ * @param image
+ * The image to move down
+ * @return The image that the given image swapped the place with, or
+ * <code>null</code> if the image did not change its place
+ */
+ public Image moveImageDown(Image image) {
+ Validation.begin().isNotNull("Image", image).check().isEqual("Image Album", image.getAlbum(), this).isEqual("Album Owner", image.getAlbum().getSone(), sone).check();
+ int oldIndex = imageIds.indexOf(image.getId());
+ if ((oldIndex == -1) || (oldIndex >= (imageIds.size() - 1))) {
+ return null;
+ }
+ imageIds.remove(image.getId());
+ imageIds.add(oldIndex + 1, image.getId());
+ return images.get(imageIds.get(oldIndex));
+ }
+
+ /**
+ * Returns the album image of this album, or {@code null} if no album image
+ * has been set.
+ *
+ * @return The image to show when this album is listed
+ */
+ public Image getAlbumImage() {
+ if (albumImage == null) {
+ return null;
+ }
+ return Default.forNull(images.get(albumImage), images.values().iterator().next());
+ }
+
+ /**
+ * Sets the ID of the album image.
+ *
+ * @param id
+ * The ID of the album image
+ * @return This album
+ */
+ public Album setAlbumImage(String id) {
+ this.albumImage = id;
+ return this;
+ }
+
+ /**
+ * Returns whether this album contains any other albums or images.
+ *
+ * @return {@code true} if this album is empty, {@code false} otherwise
+ */
+ public boolean isEmpty() {
+ return albums.isEmpty() && images.isEmpty();
+ }
+
+ /**
+ * Returns the parent album of this album.
+ *
+ * @return The parent album of this album, or {@code null} if this album
+ * does not have a parent
+ */
+ public Album getParent() {
+ return parent;
+ }
+
+ /**
+ * Sets the parent album of this album.
+ *
+ * @param parent
+ * The new parent album of this album
+ * @return This album
+ */
+ protected Album setParent(Album parent) {
+ Validation.begin().isNotNull("Album Parent", parent).check();
+ this.parent = parent;
+ return this;
+ }
+
+ /**
+ * Removes the parent album of this album.
+ *
+ * @return This album
+ */
+ protected Album removeParent() {
+ this.parent = null;
+ return this;
+ }
+
+ /**
+ * Returns the title of this album.
+ *
+ * @return The title of this album
+ */
+ public String getTitle() {
+ return title;
+ }
+
+ /**
+ * Sets the title of this album.
+ *
+ * @param title
+ * The title of this album