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;
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;
}
};
+ /** Function that transforms an album into the images it contains. */
+ public static final Function<Album, List<Image>> IMAGES = new Function<Album, List<Image>>() {
+
+ @Override
+ public List<Image> apply(Album album) {
+ return album.getImages();
+ }
+ };
+
+ /**
+ * 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;
public void addAlbum(Album album) {
checkNotNull(album, "album must not be null");
checkArgument(album.getSone().equals(sone), "album must belong to the same Sone as this album");
- checkState((this.parent == null) || (this.parent.equals(album.parent)), "album must not already be set to some other Sone");
album.setParent(this);
if (!albums.contains(album)) {
albums.add(album);