2 * Rhynodge - FileStateModifiedTrigger.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 static com.google.common.base.Preconditions.checkState;
22 import net.pterodactylus.rhynodge.Reaction;
23 import net.pterodactylus.rhynodge.State;
24 import net.pterodactylus.rhynodge.Trigger;
25 import net.pterodactylus.rhynodge.output.DefaultOutput;
26 import net.pterodactylus.rhynodge.output.Output;
27 import net.pterodactylus.rhynodge.states.FileState;
30 * {@link Trigger} that checks for modifications of a file using the existence,
31 * size, and modification time of the {@link FileState}.
33 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
35 public class FileStateModifiedTrigger implements Trigger {
37 /** Whether a change was triggered. */
38 private boolean triggered;
44 public State mergeStates(State previousState, State currentState) {
45 checkState(currentState instanceof FileState, "currentState is not a FileState but a %s", currentState.getClass());
46 checkState(previousState instanceof FileState, "previousState is not a FileState but a %s", currentState.getClass());
47 FileState currentFileState = (FileState) currentState;
48 FileState previousFileState = (FileState) previousState;
49 triggered = (currentFileState.exists() != previousFileState.exists()) || (currentFileState.size() != previousFileState.size()) || (currentFileState.modificationTime() != previousFileState.modificationTime());
57 public boolean triggers() {