/**

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

  *

  * Copyright 2013-2014 Oracle and/or its affiliates. All rights reserved.

  *

  * Oracle and Java are registered trademarks of Oracle and/or its affiliates.

  * Other names may be trademarks of their respective owners.

  *

  * The contents of this file are subject to the terms of either the GNU

  * General Public License Version 2 only ("GPL") or the Common

  * Development and Distribution License("CDDL") (collectively, the

  * "License"). You may not use this file except in compliance with the

  * License. You can obtain a copy of the License at

  * http://www.netbeans.org/cddl-gplv2.html

  * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

  * specific language governing permissions and limitations under the

  * License.  When distributing the software, include this License Header

  * Notice in each file and include the License file at

  * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the GPL Version 2 section of the License file that

  * accompanied this code. If applicable, add the following below the

  * License Header, with the fields enclosed by brackets [] replaced by

  * your own identifying information:

  * "Portions Copyrighted [year] [name of copyright owner]"

  *

  * Contributor(s):

  *

  * The Original Software is NetBeans. The Initial Developer of the Original

  * Software is Oracle. Portions Copyright 2013-2014 Oracle. All Rights Reserved.

  *

  * If you wish your version of this file to be governed by only the CDDL

  * or only the GPL Version 2, indicate your decision by adding

  * "[Contributor] elects to include this software in this distribution

  * under the [CDDL or GPL Version 2] license." If you do not indicate a

  * single choice of license, a recipient has the option to distribute

  * your version of this file under either the CDDL, the GPL Version 2 or

  * to extend the choice of license to its licensees as provided above.

  * However, if you add GPL Version 2 code and therefore, elected the GPL

  * Version 2 license, then the option applies only if the new code is

  * made subject to such option by the copyright holder.

  */

 package net.java.html.sound;

 import java.util.ServiceLoader;

 import org.apidesign.html.sound.spi.AudioEnvironment;

 /** Handle to an audio clip which can be {@link #play() played}, {@link #pause() paused}

  * and etc. Obtain new instance via {@link #create(java.lang.String) create} factory 

  * method and then use it when necessary.

  *

  * @author antonepple

  */

 public abstract class AudioClip {

     private AudioClip() {

     }

     /** Creates new instance of an audio clip based on the provided URL.

      * If no suitable audio environment provider is found, the method 

      * returns a dummy instance that does nothing and only returns

      * false from its {@link #isSupported()} method.

      * 

      * @param src the URL where to find the audio clip

      * @return the audio clip handle

      * @throws NullPointerException if src is <code>null</code>

      */

     public static AudioClip create(String src) {

         src.getClass();

         for (AudioEnvironment<?> ae : ServiceLoader.load(AudioEnvironment.class)) {

             Impl handle = create(ae, src);

             if (handle != null) {

                 return handle;

             }

         }

         return DummyClip.INSTANCE;

     }

     /** Plays the clip from begining to the end.

      */

     public abstract void play();

     /** Pauses playback of the clip

      */

     public abstract void pause();

     /**

      * Specifies the volume of the audio. Must be a number between 0.0 and 1.0:

      * <ul>

      *   <li>1.0 - highest volume</li>

      *   <li>0.5 - 50% volume</li>

      *   <li>0.0 - silent</li>

      * </ul>

      * 

      * @param volume for the playback

      */

     public abstract void setVolume(double volume);

     /** Check whether the audio clip is supported and can be played.

      * @return true if it is likely that after calling {@link #play()} 

      *   a sound will be produced

      */

     public abstract boolean isSupported();

 //    public abstract void playFrom(int seconds);

     //

     // Implementation

     //

     private static <Audio> Impl<Audio> create(AudioEnvironment<Audio> env, String src) {

         Audio a = env.create(src);

         if (a != null) {

             return new Impl<Audio>(env, src, a);

         } else {

             return null;

         }

     }

     private static final class Impl<Audio> extends AudioClip {

         private final String src;

         private final Audio clip;

         private final AudioEnvironment<Audio> env;

         public Impl(AudioEnvironment<Audio> env, String src, Audio clip) {

             this.clip = clip;

             this.env = env;

             this.src = src;

         }

         @Override

         public void play() {

             env.play(clip);

         }

         @Override

         public void pause() {

             env.pause(clip);

         }

         @Override

         public void setVolume(double volume) {

             env.setVolume(clip, volume);

         }

         @Override

         public boolean isSupported() {

             return env.isSupported(clip);

         }

         @Override

         public int hashCode() {

             return 59 * src.hashCode();

         }

         @Override

         public boolean equals(Object obj) {

             if (obj instanceof Impl) {

                 return src.equals(((Impl)obj).src);

             }

             return false;

         }

     } // end of Impl

     private static final class DummyClip extends AudioClip {

         static AudioClip INSTANCE = new DummyClip();

         @Override

         public void play() {

         }

         @Override

         public void pause() {

         }

         @Override

         public void setVolume(double volume) {

         }

         @Override

         public boolean isSupported() {

             return false;

         }

     } // end of DummyClip

 }