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.checkState;
20 import static java.util.UUID.randomUUID;
22 import net.pterodactylus.sone.database.ImageBuilder;
25 * Abstract {@link ImageBuilder} implementation. It stores the state of the new
26 * album and performs validation, you only need to implement {@link #build()}.
28 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
30 public abstract class AbstractImageBuilder implements ImageBuilder {
32 /** Whether to create an album with a random ID. */
33 protected boolean randomId;
35 /** The ID of the album to create. */
37 protected long creationTime;
38 protected boolean createdNow;
44 public ImageBuilder randomId() {
50 public ImageBuilder withId(String id) {
56 public ImageBuilder created(long creationTime) {
57 this.creationTime = creationTime;
62 public ImageBuilder createdNow() {
68 public ImageBuilder at(String key) {
74 public ImageBuilder sized(int width, int height) {
84 protected String getId() {
85 return randomId ? randomUUID().toString() : id;
88 protected long getCreationTime() {
89 return createdNow ? System.currentTimeMillis() : creationTime;
93 * Validates the state of this image builder.
95 * @throws IllegalStateException
96 * if the state is not valid for building a new image
98 protected void validate() throws IllegalStateException {
99 checkState((randomId && (id == null)) || (!randomId && (id != null)), "exactly one of random ID or custom ID must be set");
100 checkState((createdNow && (creationTime == 0)) || (!createdNow && (creationTime > 0)), "exactly one of created now or creation time must be set");
101 checkState((width > 0) && (height > 0), "width and height must be set");