From 61aad345c6ed96f7b5720eddcdd1fd60fba7189b Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Wed, 2 Jan 2013 21:13:08 +0100
Subject: [PATCH] Add trigger that detects new torrents.

---
 .../reactor/triggers/NewTorrentTrigger.java        | 69 ++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 src/main/java/net/pterodactylus/reactor/triggers/NewTorrentTrigger.java

diff --git a/src/main/java/net/pterodactylus/reactor/triggers/NewTorrentTrigger.java b/src/main/java/net/pterodactylus/reactor/triggers/NewTorrentTrigger.java
new file mode 100644
index 0000000..1eb2247
--- /dev/null
+++ b/src/main/java/net/pterodactylus/reactor/triggers/NewTorrentTrigger.java
@@ -0,0 +1,69 @@
+/*
+ * Reactor - NewTorrentTrigger.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 static com.google.common.base.Preconditions.checkState;
+
+import java.util.List;
+
+import net.pterodactylus.reactor.State;
+import net.pterodactylus.reactor.Trigger;
+import net.pterodactylus.reactor.states.TorrentState;
+import net.pterodactylus.reactor.states.TorrentState.TorrentFile;
+
+import com.google.common.collect.Lists;
+
+/**
+ * {@link Trigger} implementation that is triggered by {@link TorrentFile}s that
+ * appear in the current {@link TorrentState} but not in the previous one.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class NewTorrentTrigger implements Trigger {
+
+	/** The newly detected torrent files. */
+	private List<TorrentFile> torrentFiles = Lists.newArrayList();
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public boolean triggers(State currentState, State previousState) {
+		checkState(currentState instanceof TorrentState, "currentState is not a TorrentState but a %s", currentState.getClass().getName());
+		checkState(previousState instanceof TorrentState, "previousState is not a TorrentState but a %s", currentState.getClass().getName());
+		TorrentState currentTorrentState = (TorrentState) currentState;
+		TorrentState previousTorrentState = (TorrentState) previousState;
+		torrentFiles.clear();
+		for (TorrentFile torrentFile : currentTorrentState) {
+			torrentFiles.add(torrentFile);
+		}
+		for (TorrentFile torrentFile : previousTorrentState) {
+			torrentFiles.remove(torrentFile);
+		}
+		return !torrentFiles.isEmpty();
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public Object trigger() {
+		return torrentFiles;
+	}
+
+}
-- 
2.7.4