From: David ‘Bombe’ Roden <bombe@pterodactylus.net>
Date: Wed, 2 Jan 2013 10:07:52 +0000 (+0100)
Subject: Add trigger for the existence of files.
X-Git-Tag: 0.1~120
X-Git-Url: https://git.pterodactylus.net/?a=commitdiff_plain;h=2447518c3e5f8269f12f772c5d11dca10b3967f2;p=rhynodge.git

Add trigger for the existence of files.
---

diff --git a/src/main/java/net/pterodactylus/reactor/triggers/FileExistenceTrigger.java b/src/main/java/net/pterodactylus/reactor/triggers/FileExistenceTrigger.java
new file mode 100644
index 0000000..2be86ea
--- /dev/null
+++ b/src/main/java/net/pterodactylus/reactor/triggers/FileExistenceTrigger.java
@@ -0,0 +1,42 @@
+/*
+ * Reactor - FileExistenceTrigger.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 <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.reactor.triggers;
+
+import net.pterodactylus.reactor.Trigger;
+import net.pterodactylus.reactor.states.FileState;
+
+/**
+ * A trigger that detects changes in the existence of a file.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class FileExistenceTrigger implements Trigger<FileState> {
+
+	//
+	// TRIGGER METHODS
+	//
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public boolean triggers(FileState previousState, FileState currentState) {
+		return previousState.exists() != currentState.exists();
+	}
+
+}