+/*
+ * Sone - AbstractAlbum.java - Copyright © 2013 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sone.data.impl;
+
+import static com.google.common.base.Optional.absent;
+import static com.google.common.base.Optional.fromNullable;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import net.pterodactylus.sone.data.Album;
+import net.pterodactylus.sone.data.Image;
+
+import com.google.common.base.Optional;
+import com.google.common.hash.Hasher;
+import com.google.common.hash.Hashing;
+
+/**
+ * Abstract {@link Album} implementation that contains only the attributes that
+ * are {@link String}s or primitives.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public abstract class AbstractAlbum implements Album {
+
+ protected final String id;
+ protected String title;
+ protected String description;
+ protected String albumImage;
+
+ protected AbstractAlbum(String id) {
+ this.id = checkNotNull(id, "id must not be null");
+ }
+
+ @Override
+ public String getId() {
+ return id;
+ }
+
+ @Override
+ public boolean isEmpty() {
+ return getAlbums().isEmpty() && getImages().isEmpty();
+ }
+
+ @Override
+ public boolean isRoot() {
+ return getParent() == null;
+ }
+
+ @Override
+ public String getTitle() {
+ return title;
+ }
+
+ @Override
+ public String getDescription() {
+ return description;
+ }
+
+ @Override
+ public Modifier modify() throws IllegalStateException {
+ // TODO: reenable check for local Sones
+ return new Modifier() {
+ private Optional<String> title = absent();
+ private Optional<String> description = absent();
+ private Optional<String> albumImage = absent();
+
+ @Override
+ public Modifier setTitle(String title) {
+ this.title = fromNullable(title);
+ return this;
+ }
+
+ @Override
+ public Modifier setDescription(String description) {
+ this.description = fromNullable(description);
+ return this;
+ }
+
+ @Override
+ public Modifier setAlbumImage(String imageId) {
+ this.albumImage = fromNullable(imageId);
+ return this;
+ }
+
+ @Override
+ public Album update() throws IllegalStateException {
+ if (title.isPresent()) {
+ AbstractAlbum.this.title = title.get();
+ }
+ if (description.isPresent()) {
+ AbstractAlbum.this.description = description.get();
+ }
+ if (albumImage.isPresent()) {
+ AbstractAlbum.this.albumImage = albumImage.get();
+ }
+ return AbstractAlbum.this;
+ }
+ };
+ }
+
+ @Override
+ public String getFingerprint() {
+ 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) {
+ hash.putString("AlbumImage(").putString(albumImage).putString(")");
+ }
+
+ /* add nested albums. */
+ hash.putString("Albums(");
+ for (Album album : getAlbums()) {
+ hash.putString(album.getFingerprint());
+ }
+ hash.putString(")");
+
+ /* add images. */
+ hash.putString("Images(");
+ for (Image image : getImages()) {
+ if (image.isInserted()) {
+ hash.putString(image.getFingerprint());
+ }
+ }
+ hash.putString(")");
+
+ hash.putString(")");
+ return hash.hash().toString();
+ }
+
+ @Override
+ public int hashCode() {
+ return id.hashCode();
+ }
+
+ @Override
+ public boolean equals(Object object) {
+ if (!(object instanceof DefaultAlbum)) {
+ return false;
+ }
+ DefaultAlbum album = (DefaultAlbum) object;
+ return id.equals(album.id);
+ }
+}