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.Preconditions.checkNotNull;
20 import static com.google.common.base.Preconditions.checkState;
21 import static java.util.UUID.randomUUID;
23 import net.pterodactylus.sone.data.Album;
24 import net.pterodactylus.sone.data.Sone;
25 import net.pterodactylus.sone.database.ImageBuilder;
28 * Abstract {@link ImageBuilder} implementation. It stores the state of the new
29 * album and performs validation, you only need to implement {@link #build()}.
31 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
33 public abstract class AbstractImageBuilder implements ImageBuilder {
35 protected final Album album;
37 /** Whether to create an album with a random ID. */
38 protected boolean randomId;
40 /** The ID of the album to create. */
43 protected long creationTime;
44 protected boolean createdNow;
49 public AbstractImageBuilder(Album album) {
50 this.album = checkNotNull(album, "album must not be null");
54 public ImageBuilder randomId() {
60 public ImageBuilder withId(String id) {
66 public ImageBuilder by(Sone sone) {
72 public ImageBuilder created(long creationTime) {
73 this.creationTime = creationTime;
78 public ImageBuilder createdNow() {
84 public ImageBuilder at(String key) {
90 public ImageBuilder sized(int width, int height) {
100 protected String getId() {
101 return randomId ? randomUUID().toString() : id;
104 protected long getCreationTime() {
105 return createdNow ? System.currentTimeMillis() : creationTime;
109 * Validates the state of this image builder.
111 * @throws IllegalStateException
112 * if the state is not valid for building a new image
114 protected void validate() throws IllegalStateException {
115 checkState((randomId && (id == null)) || (!randomId && (id != null)), "exactly one of random ID or custom ID must be set");
116 checkState(sone != null, "sone must not be null");
117 checkState((createdNow && (creationTime == 0)) || (!createdNow && (creationTime > 0)), "exactly one of created now or creation time must be set");
118 checkState((width > 0) && (height > 0), "width and height must be set");