2 * Sone - AbstractImageBuilder.java - Copyright © 2013–2020 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;
21 import net.pterodactylus.sone.database.ImageBuilder;
24 * Abstract {@link ImageBuilder} implementation. It stores the state of the new
25 * album and performs validation, you only need to implement {@link #build()}.
27 public abstract class AbstractImageBuilder implements ImageBuilder {
29 /** Whether to create an album with a random ID. */
30 protected boolean randomId;
32 /** The ID of the album to create. */
36 public ImageBuilder randomId() {
42 public ImageBuilder withId(String id) {
52 * Validates the state of this image builder.
54 * @throws IllegalStateException
55 * if the state is not valid for building a new image
57 protected void validate() throws IllegalStateException {
58 checkState((randomId && (id == null)) || (!randomId && (id != null)), "exactly one of random ID or custom ID must be set");