import com.google.common.base.Optional;
import com.google.common.base.Predicates;
import com.google.common.collect.Collections2;
+import com.google.common.collect.FluentIterable;
+import com.google.common.collect.ImmutableList;
+import com.google.common.hash.Hasher;
+import com.google.common.hash.Hashing;
/**
* Container for images that can also contain nested {@link Album}s.
}
};
+ /** Function that flattens the given album and all albums beneath it. */
+ public static final Function<Album, List<Album>> FLATTENER = new Function<Album, List<Album>>() {
+
+ @Override
+ public List<Album> apply(Album album) {
+ List<Album> albums = new ArrayList<Album>();
+ albums.add(album);
+ for (Album subAlbum : album.getAlbums()) {
+ albums.addAll(FluentIterable.from(ImmutableList.of(subAlbum)).transformAndConcat(FLATTENER).toList());
+ }
+ return albums;
+ }
+ };
+
/** The ID of this album. */
private final String id;
*/
@Override
public String getFingerprint() {
- StringBuilder fingerprint = new StringBuilder();
- fingerprint.append("Album(");
- fingerprint.append("ID(").append(id).append(')');
- fingerprint.append("Title(").append(title).append(')');
- fingerprint.append("Description(").append(description).append(')');
+ Hasher hash = Hashing.sha256().newHasher();
+ hash.putString("Album(");
+ hash.putString("ID(").putString(id).putString(")");
+ hash.putString("Title(").putString(title).putString(")");
+ hash.putString("Description(").putString(description).putString(")");
if (albumImage != null) {
- fingerprint.append("AlbumImage(").append(albumImage).append(')');
+ hash.putString("AlbumImage(").putString(albumImage).putString(")");
}
/* add nested albums. */
- fingerprint.append("Albums(");
+ hash.putString("Albums(");
for (Album album : albums) {
- fingerprint.append(album.getFingerprint());
+ hash.putString(album.getFingerprint());
}
- fingerprint.append(')');
+ hash.putString(")");
/* add images. */
- fingerprint.append("Images(");
+ hash.putString("Images(");
for (Image image : getImages()) {
if (image.isInserted()) {
- fingerprint.append(image.getFingerprint());
+ hash.putString(image.getFingerprint());
}
}
- fingerprint.append(')');
+ hash.putString(")");
- fingerprint.append(')');
- return fingerprint.toString();
+ hash.putString(")");
+ return hash.hash().toString();
}
//