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/**
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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*
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* Copyright 2013-2014 Oracle and/or its affiliates. All rights reserved.
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*
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* Oracle and Java are registered trademarks of Oracle and/or its affiliates.
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* Other names may be trademarks of their respective owners.
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*
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* The contents of this file are subject to the terms of either the GNU
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* General Public License Version 2 only ("GPL") or the Common
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* Development and Distribution License("CDDL") (collectively, the
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* "License"). You may not use this file except in compliance with the
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* License. You can obtain a copy of the License at
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* http://www.netbeans.org/cddl-gplv2.html
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* or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
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* specific language governing permissions and limitations under the
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* License. When distributing the software, include this License Header
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* Notice in each file and include the License file at
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* nbbuild/licenses/CDDL-GPL-2-CP. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the GPL Version 2 section of the License file that
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* accompanied this code. If applicable, add the following below the
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* License Header, with the fields enclosed by brackets [] replaced by
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* your own identifying information:
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* "Portions Copyrighted [year] [name of copyright owner]"
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*
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* Contributor(s):
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*
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* The Original Software is NetBeans. The Initial Developer of the Original
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* Software is Oracle. Portions Copyright 2013-2014 Oracle. All Rights Reserved.
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*
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* If you wish your version of this file to be governed by only the CDDL
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* or only the GPL Version 2, indicate your decision by adding
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* "[Contributor] elects to include this software in this distribution
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* under the [CDDL or GPL Version 2] license." If you do not indicate a
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* single choice of license, a recipient has the option to distribute
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* your version of this file under either the CDDL, the GPL Version 2 or
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* to extend the choice of license to its licensees as provided above.
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* However, if you add GPL Version 2 code and therefore, elected the GPL
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* Version 2 license, then the option applies only if the new code is
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* made subject to such option by the copyright holder.
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*/
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package net.java.html.sound;
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import java.util.ServiceLoader;
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import org.apidesign.html.sound.spi.AudioEnvironment;
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/** Handle to an audio clip which can be {@link #play() played}, {@link #pause() paused}
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* and etc. Obtain new instance via {@link #create(java.lang.String) create} factory
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* method and then use it when necessary.
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*
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* @author antonepple
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*/
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public abstract class AudioClip {
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private AudioClip() {
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}
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/** Creates new instance of an audio clip based on the provided URL.
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* If no suitable audio environment provider is found, the method
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* returns a dummy instance that does nothing and only returns
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* false from its {@link #isSupported()} method.
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*
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* @param src the URL where to find the audio clip
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* @return the audio clip handle
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* @throws NullPointerException if src is <code>null</code>
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*/
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public static AudioClip create(String src) {
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src.getClass();
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for (AudioEnvironment<?> ae : ServiceLoader.load(AudioEnvironment.class)) {
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Impl handle = create(ae, src);
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if (handle != null) {
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return handle;
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}
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}
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return DummyClip.INSTANCE;
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}
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/** Plays the clip from begining to the end.
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*/
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public abstract void play();
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/** Pauses playback of the clip
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*/
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public abstract void pause();
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/**
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* Specifies the volume of the audio. Must be a number between 0.0 and 1.0:
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* <ul>
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* <li>1.0 - highest volume</li>
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* <li>0.5 - 50% volume</li>
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* <li>0.0 - silent</li>
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* </ul>
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*
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* @param volume for the playback
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*/
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public abstract void setVolume(double volume);
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/** Check whether the audio clip is supported and can be played.
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* @return true if it is likely that after calling {@link #play()}
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* a sound will be produced
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*/
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public abstract boolean isSupported();
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// public abstract void playFrom(int seconds);
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//
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// Implementation
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//
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private static <Audio> Impl<Audio> create(AudioEnvironment<Audio> env, String src) {
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Audio a = env.create(src);
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if (a != null) {
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return new Impl<Audio>(env, src, a);
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} else {
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return null;
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}
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}
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private static final class Impl<Audio> extends AudioClip {
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private final String src;
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private final Audio clip;
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private final AudioEnvironment<Audio> env;
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public Impl(AudioEnvironment<Audio> env, String src, Audio clip) {
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this.clip = clip;
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this.env = env;
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this.src = src;
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}
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@Override
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public void play() {
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env.play(clip);
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}
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@Override
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public void pause() {
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env.pause(clip);
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}
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@Override
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public void setVolume(double volume) {
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env.setVolume(clip, volume);
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}
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@Override
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public boolean isSupported() {
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return env.isSupported(clip);
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}
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@Override
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public int hashCode() {
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return 59 * src.hashCode();
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}
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@Override
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public boolean equals(Object obj) {
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if (obj instanceof Impl) {
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return src.equals(((Impl)obj).src);
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}
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return false;
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}
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} // end of Impl
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private static final class DummyClip extends AudioClip {
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static AudioClip INSTANCE = new DummyClip();
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@Override
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public void play() {
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}
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@Override
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public void pause() {
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}
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@Override
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public void setVolume(double volume) {
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}
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@Override
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public boolean isSupported() {
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return false;
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}
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} // end of DummyClip
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} |