2 * rhynodge - NewComicTrigger.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.rhynodge.triggers;
20 import java.util.HashSet;
23 import net.pterodactylus.rhynodge.State;
24 import net.pterodactylus.rhynodge.Trigger;
25 import net.pterodactylus.rhynodge.states.ComicState;
26 import net.pterodactylus.rhynodge.states.ComicState.Comic;
28 import static com.google.common.base.Preconditions.checkArgument;
31 * {@link Trigger} implementation that detects the presence of new {@link
32 * Comic}s in a {@link ComicState}.
34 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
36 public class NewComicTrigger implements Trigger {
38 private boolean triggered = false;
41 public State mergeStates(State previousState, State currentState) {
42 checkArgument(previousState instanceof ComicState, "previous state must be a comic state");
43 checkArgument(currentState instanceof ComicState, "current state must be a comic state");
45 ComicState previousComicState = (ComicState) previousState;
46 ComicState currentComicState = (ComicState) currentState;
48 Set<Comic> allComics = new HashSet<>(previousComicState.comics());
49 Set<Comic> newComics = new HashSet<>();
51 for (Comic comic : currentComicState) {
52 if (allComics.add(comic)) {
58 return new ComicState(allComics, newComics);
62 public boolean triggers() {