2 * Sone - AbstractImageBuilder.java - Copyright © 2013 David Roden
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 package net.pterodactylus.sone.data.impl;
19 import static com.google.common.base.Optional.absent;
20 import static com.google.common.base.Optional.fromNullable;
21 import static com.google.common.base.Optional.of;
22 import static com.google.common.base.Preconditions.checkState;
23 import static java.lang.System.currentTimeMillis;
24 import static java.util.UUID.randomUUID;
26 import net.pterodactylus.sone.database.ImageBuilder;
28 import com.google.common.base.Optional;
31 * Abstract {@link ImageBuilder} implementation. It stores the state of the new
32 * album and performs validation, you only need to implement {@link #build()}.
34 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
36 public abstract class AbstractImageBuilder implements ImageBuilder {
38 protected Optional<String> id = absent();
39 protected Optional<Long> creationTime = absent();
45 public ImageBuilder withId(String id) {
46 this.id = fromNullable(id);
51 public ImageBuilder created(long creationTime) {
52 this.creationTime = of(creationTime);
57 public ImageBuilder at(String key) {
63 public ImageBuilder sized(int width, int height) {
73 protected String getId() {
74 return id.isPresent() ? id.get() : randomUUID().toString();
77 protected long getCreationTime() {
78 return creationTime.isPresent() ? creationTime.get() : currentTimeMillis();
82 * Validates the state of this image builder.
84 * @throws IllegalStateException
85 * if the state is not valid for building a new image
87 protected void validate() throws IllegalStateException {
88 checkState((width > 0) && (height > 0), "width and height must be set");