2 * Sonitus - AbstractControlledComponent.java - Copyright © 2013 David Roden
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 package net.pterodactylus.sonitus.data;
20 import java.util.List;
21 import java.util.concurrent.atomic.AtomicReference;
23 import com.google.common.collect.Lists;
26 * Abstract {@link ControlledComponent} implementation that takes care of
27 * managing {@link MetadataListener}s.
29 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
31 public abstract class AbstractControlledComponent implements ControlledComponent {
33 /** The name of this filter. */
34 private final String name;
36 /** The list of metadata listeners. */
37 private final List<MetadataListener> metadataListeners = Lists.newCopyOnWriteArrayList();
39 /** The current metadata. */
40 private final AtomicReference<Metadata> metadata = new AtomicReference<Metadata>();
43 * Creates a new abstract controlled component.
46 * The name of the component
48 protected AbstractControlledComponent(String name) {
53 // LISTENER MANAGEMENT
57 public void addMetadataListener(MetadataListener metadataListener) {
58 metadataListeners.add(metadataListener);
62 public void removeMetadataListener(MetadataListener metadataListener) {
63 metadataListeners.remove(metadataListener);
67 // CONTROLLEDCOMPONENT METHODS
71 public String name() {
76 public Metadata metadata() {
77 return metadata.get();
81 public void metadataUpdated(Metadata metadata) {
82 if (metadata.equals(this.metadata.get())) {
85 this.metadata.set(metadata);
86 fireMetadataUpdated(metadata);
94 * Notifies all registered metadata listeners that the metadata has changed.
99 protected void fireMetadataUpdated(Metadata metadata) {
100 for (MetadataListener metadataListener : metadataListeners) {
101 metadataListener.metadataUpdated(this, metadata);