From 4988daaa80c5134d977b16cad8c09ea5b9ceebb1 Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Sun, 26 May 2013 13:22:07 +0200
Subject: [PATCH] Add abstract controller implementation.

---
 .../data/controller/AbstractController.java        | 112 +++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 src/main/java/net/pterodactylus/sonitus/data/controller/AbstractController.java

diff --git a/src/main/java/net/pterodactylus/sonitus/data/controller/AbstractController.java b/src/main/java/net/pterodactylus/sonitus/data/controller/AbstractController.java
new file mode 100644
index 0000000..43276fc
--- /dev/null
+++ b/src/main/java/net/pterodactylus/sonitus/data/controller/AbstractController.java
@@ -0,0 +1,112 @@
+/*
+ * Sonitus - AbstractController.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.sonitus.data.controller;
+
+import net.pterodactylus.sonitus.data.Controller;
+
+/**
+ * Base {@link Controller} implementation that does housekeeping for the common
+ * values. Additional functionality (or an arbitrary mapping for the values of a
+ * controller) can be added in subclasses.
+ * <p/>
+ * This implementation is not thread-safe.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public abstract class AbstractController implements Controller {
+
+	/** The minimum value of this controller. */
+	private final int minimum;
+
+	/** The maximum value of this controller. */
+	private final int maximum;
+
+	/** Whether this controller has a “center” position. */
+	private final boolean centered;
+
+	/** The current value of this controller. */
+	private int value;
+
+	/**
+	 * Creates a new abstract controller.
+	 *
+	 * @param minimum
+	 * 		The minimum value of the controller
+	 * @param maximum
+	 * 		The maximum value of the controller
+	 * @param centered
+	 * 		{@code true} if this controller has a “center” position, {@code false}
+	 * 		otherwise
+	 * @param currentValue
+	 * 		The current value of this controller
+	 */
+	public AbstractController(int minimum, int maximum, boolean centered, int currentValue) {
+		this.minimum = minimum;
+		this.maximum = maximum;
+		this.centered = centered;
+		value = currentValue;
+	}
+
+	//
+	// CONTROLLER METHODS
+	//
+
+	@Override
+	public int minimum() {
+		return minimum;
+	}
+
+	@Override
+	public int maximum() {
+		return maximum;
+	}
+
+	@Override
+	public boolean centered() {
+		return centered;
+	}
+
+	@Override
+	public int value() {
+		return value;
+	}
+
+	@Override
+	public void value(int value) {
+		int newValue = Math.min(maximum, Math.max(minimum, value));
+		if (newValue != this.value) {
+			this.value = newValue;
+			valueSet(newValue);
+		}
+	}
+
+	//
+	// SUBCLASS METHODS
+	//
+
+	/**
+	 * Adjusts the controller. This method is called from {@link #value(int)} if
+	 * the new value is different from the current value. Also, the value is
+	 * clamped to fit within the range of this controller.
+	 *
+	 * @param value
+	 * 		The new value
+	 */
+	protected abstract void valueSet(int value);
+
+}
-- 
2.7.4