package org.apidesign.samples;

// BEGIN: xmms.java.api.ext

// BEGIN: xmms.java.api

public final class XMMS {

    public void play() { 

        doPlay();

    }

    public void pause() { 

        doPause();

    }

    public void addToPlaylist(String file) { 

        doAddToPlaylist(file);

    }

// FINISH: xmms.java.api

    /** @since 2.0 we can also control volume */

    public void setVolume(int volume) { 

        doTuneVolume(volume);

    }

// FINISH: xmms.java.api.ext

    // BEGIN: xmms.java.spi.ext

    // BEGIN: xmms.java.spi

    interface Playback {

        public void playback(byte[] data);

    // FINISH: xmms.java.spi

        /** @since 2.0 we can also control volume */

        interface Volume extends Playback {

            public void setVolume(int volume);

        }

    }

    // END: xmms.java.spi.ext

    public void registerPlayback(Playback callback) {

        this.callback = callback;

    }

    private Playback callback;

    private void doAddToPlaylist(String file) {

    }

    private void doPause() {

    }

    private void doPlay() {

        callback.playback("Play!".getBytes());

    }

    // BEGIN: xmms.java.spi.instanceof

    private void doTuneVolume(int volume) {

        if (callback instanceof Playback.Volume) {

            Playback.Volume pv = (Playback.Volume) callback;

            pv.setVolume(volume);

        }

    }

    // END: xmms.java.spi.instanceof

    //

    // Usage

    // 

    public static void main(String[] args) {

        XMMS xmms = new XMMS();

        // BEGIN: xmms.java.use

        class MyCallbackPrints implements XMMS.Playback {

            public void playback(byte[] data) {

                System.out.println(new String(data));

            }

        }

        xmms.registerPlayback(new MyCallbackPrints());

        // END: xmms.java.use

    }

}