From: David ‘Bombe’ Roden <bombe@pterodactylus.net>
Date: Wed, 2 Jan 2013 10:13:42 +0000 (+0100)
Subject: Try to bind together queries, triggers, and actions.
X-Git-Tag: 0.1~119
X-Git-Url: https://git.pterodactylus.net/?a=commitdiff_plain;h=ed9b0797c5dcc85c57a93fde0ee6ad1156f0ffe2;p=rhynodge.git

Try to bind together queries, triggers, and actions.
---

diff --git a/src/main/java/net/pterodactylus/reactor/Reaction.java b/src/main/java/net/pterodactylus/reactor/Reaction.java
new file mode 100644
index 0000000..0e0b359
--- /dev/null
+++ b/src/main/java/net/pterodactylus/reactor/Reaction.java
@@ -0,0 +1,110 @@
+/*
+ * Reactor - Reaction.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;
+
+/**
+ * A {@code Reaction} binds together {@link Query}s, {@link Trigger}s, and
+ * {@link Action}s, and it stores the intermediary {@link State}s.
+ *
+ * @param <S>
+ *            The type of the state
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class Reaction<S extends State> {
+
+	/** The query to run. */
+	private final Query<S> query;
+
+	/** The trigger to detect changes. */
+	private final Trigger<S> trigger;
+
+	/** The action to perform. */
+	private final Action<S> action;
+
+	/** The current state of the query. */
+	private S currentState;
+
+	/** The previous state of the query. */
+	private S previousState;
+
+	/**
+	 * Creates a new reaction.
+	 *
+	 * @param query
+	 *            The query to run
+	 * @param trigger
+	 *            The trigger to detect changes
+	 * @param action
+	 *            The action to perform
+	 */
+	public Reaction(Query<S> query, Trigger<S> trigger, Action<S> action) {
+		this.query = query;
+		this.trigger = trigger;
+		this.action = action;
+	}
+
+	//
+	// ACCESSORS
+	//
+
+	/**
+	 * Returns the query to run.
+	 *
+	 * @return The query to run
+	 */
+	public Query<S> query() {
+		return query;
+	}
+
+	/**
+	 * Returns the trigger to detect changes.
+	 *
+	 * @return The trigger to detect changes
+	 */
+	public Trigger<S> trigger() {
+		return trigger;
+	}
+
+	/**
+	 * Returns the action to perform.
+	 *
+	 * @return The action to perform
+	 */
+	public Action<S> action() {
+		return action;
+	}
+
+	/**
+	 * Returns the current state of the query.
+	 *
+	 * @return The current state of the query
+	 */
+	public S currentState() {
+		return currentState;
+	}
+
+	/**
+	 * Returns the previous state of the query.
+	 *
+	 * @return The previous state of the query
+	 */
+	public S previousState() {
+		return previousState;
+	}
+
+}