2 * Sone - AbstractPostBuilder.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/>.
18 package net.pterodactylus.sone.data.impl;
20 import static com.google.common.base.Optional.absent;
21 import static com.google.common.base.Optional.fromNullable;
22 import static com.google.common.base.Optional.of;
23 import static com.google.common.base.Preconditions.checkNotNull;
24 import static com.google.common.base.Preconditions.checkState;
25 import static java.lang.System.currentTimeMillis;
26 import static java.util.UUID.randomUUID;
28 import net.pterodactylus.sone.database.Database;
29 import net.pterodactylus.sone.database.PostBuilder;
31 import com.google.common.base.Optional;
32 import org.apache.commons.lang.StringUtils;
35 * Abstract {@link PostBuilder} implementation. It stores the state of the new
36 * post and performs validation, you only need to implement {@link #build()}.
38 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
40 public abstract class AbstractPostBuilder implements PostBuilder {
42 protected final Database database;
43 protected final String senderId;
45 /** The ID of the post. */
46 protected Optional<String> id = absent();
48 /** The time of the post. */
49 protected Optional<Long> time = absent();
51 /** The text of the post. */
52 protected String text;
54 /** The (optional) recipient of the post. */
55 protected Optional<String> recipientId = absent();
57 protected AbstractPostBuilder(Database database, String soneId) {
58 this.database = checkNotNull(database, "database must not be null");
59 this.senderId = checkNotNull(soneId, "sender ID must not be null");
63 // POSTBUILDER METHODS
67 public PostBuilder withId(String id) {
68 this.id = fromNullable(id);
73 public PostBuilder withTime(long time) {
79 public PostBuilder withText(String text) {
85 public PostBuilder to(Optional<String> recipientId) {
86 this.recipientId = recipientId;
94 protected String getId() {
95 return id.isPresent() ? id.get() : randomUUID().toString();
98 protected long getTime() {
99 return time.isPresent() ? time.get() : currentTimeMillis();
103 * Validates the state of this post builder.
105 * @throws IllegalStateException
106 * if the state is not valid for building a new post
108 protected void validate() throws IllegalStateException {
109 checkState(!StringUtils.isBlank(text), "text must not be empty");
110 checkState(!recipientId.isPresent() || !senderId.equals(recipientId.get()), "sender and recipient must not be the same");