+/*
+ * jSite-next - ListenerSupport.java -
+ * Copyright © 2008 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+package net.pterodactylus.util.event;
+
+import java.util.ArrayList;
+import java.util.EventListener;
+import java.util.List;
+
+/**
+ * Helper class for {@link EventListener} management.
+ *
+ * @param <L>
+ * The type of the event listener
+ * @author David Roden <droden@gmail.com>
+ */
+public class ListenerSupport<L extends EventListener> {
+
+ /** The list of registered listeners. */
+ private final List<L> listeners = new ArrayList<L>();
+
+ /**
+ * Adds a listener to the list of registered listeners.
+ *
+ * @param listener
+ * The listener to add
+ */
+ public void addListener(L listener) {
+ synchronized (listeners) {
+ listeners.add(listener);
+ }
+ }
+
+ /**
+ * Removes a listener from the list of registered listeners.
+ *
+ * @param listener
+ * The listener to remove
+ */
+ public void removeListener(L listener) {
+ synchronized (listeners) {
+ listeners.remove(listener);
+ }
+ }
+
+ /**
+ * Returns a list of all listeners. This list is a copy of the internally
+ * kept list and as thus will not be modified by calls to
+ * {@link #addListener(EventListener)} or
+ * {@link #removeListener(EventListener)}.
+ *
+ * @return The list of all listeners
+ */
+ protected List<L> getListeners() {
+ synchronized (listeners) {
+ return new ArrayList<L>(listeners);
+ }
+ }
+
+}