import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import static java.util.Arrays.asList;
+import static java.util.Collections.emptyList;
import java.util.ArrayList;
+import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
+import javax.annotation.Nonnull;
import com.google.common.base.Function;
import com.google.common.base.Optional;
public static final Function<Album, List<Album>> FLATTENER = new Function<Album, List<Album>>() {
@Override
+ @Nonnull
public List<Album> apply(Album album) {
+ if (album == null) {
+ return emptyList();
+ }
List<Album> albums = new ArrayList<Album>();
albums.add(album);
for (Album subAlbum : album.getAlbums()) {
public static final Function<Album, List<Image>> IMAGES = new Function<Album, List<Image>>() {
@Override
+ @Nonnull
public List<Image> apply(Album album) {
- return album.getImages();
+ return (album != null) ? album.getImages() : Collections.<Image>emptyList();
}
};
}
/**
+ * Returns whether this album is an identitiy’s root album.
+ *
+ * @return {@code true} if this album is an identity’s root album, {@code
+ * false} otherwise
+ */
+ public boolean isRoot() {
+ return parent == null;
+ }
+
+ /**
* Returns the parent album of this album.
*
* @return The parent album of this album, or {@code null} if this album