From f2d8560d431f315a2eca10f4bdb36448dabef44a Mon Sep 17 00:00:00 2001 From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?= Date: Wed, 2 Jan 2013 13:26:51 +0100 Subject: [PATCH] Add trigger that checks for changes in a FileState. --- .../reactor/triggers/FileStateModifiedTrigger.java | 45 ++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 src/main/java/net/pterodactylus/reactor/triggers/FileStateModifiedTrigger.java diff --git a/src/main/java/net/pterodactylus/reactor/triggers/FileStateModifiedTrigger.java b/src/main/java/net/pterodactylus/reactor/triggers/FileStateModifiedTrigger.java new file mode 100644 index 0000000..9263a5f --- /dev/null +++ b/src/main/java/net/pterodactylus/reactor/triggers/FileStateModifiedTrigger.java @@ -0,0 +1,45 @@ +/* + * Reactor - FileStateModifiedTrigger.java - Copyright © 2013 David Roden + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +package net.pterodactylus.reactor.triggers; + +import static com.google.common.base.Preconditions.checkState; +import net.pterodactylus.reactor.State; +import net.pterodactylus.reactor.Trigger; +import net.pterodactylus.reactor.states.FileState; + +/** + * {@link Trigger} that checks for modifications of a file using the existence, + * size, and modification time of the {@link FileState}. + * + * @author David ‘Bombe’ Roden + */ +public class FileStateModifiedTrigger implements Trigger { + + /** + * {@inheritDoc} + */ + @Override + public boolean triggers(State currentState, State previousState) { + checkState(currentState instanceof FileState, "currentState is not a FileState but a %s", currentState.getClass()); + checkState(previousState instanceof FileState, "previousState is not a FileState but a %s", currentState.getClass()); + FileState currentFileState = (FileState) currentState; + FileState previousFileState = (FileState) previousState; + return (currentFileState.exists() != previousFileState.exists()) || (currentFileState.size() != previousFileState.size()) || (currentFileState.modificationTime() != previousFileState.modificationTime()); + } + +} -- 2.7.4