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/*
* Copyright (c) 2008, Christophe Delory
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY CHRISTOPHE DELORY ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL CHRISTOPHE DELORY BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package chameleon.playlist.xspf;
import java.io.InputStream;
import java.io.StringReader;
import org.apache.commons.logging.Log;
import chameleon.content.type.ContentType;
import chameleon.io.IOUtils;
import chameleon.player.PlayerSupport;
import chameleon.playlist.AbstractPlaylistComponent;
import chameleon.playlist.Media;
import chameleon.playlist.Parallel;
import chameleon.playlist.Sequence;
import chameleon.playlist.SpecificPlaylist;
import chameleon.playlist.SpecificPlaylistProvider;
import chameleon.xml.XmlSerializer;
/**
* XML Shareable Playlist Format (XSPF), pronounced spiff, is an XML-based playlist format for digital media, sponsored by the Xiph.Org Foundation.
* Lucas Gonze of Yahoo.com/Webjay.org originated the format in 2004.
* XSPF is a data format for sharing the kind of playlist that can be played on a personal computer or portable device.
* In the same way that any user on any computer can open any web page, XSPF is intended to provide portability for playlists.
* @version $Revision: 91 $
* @author Christophe Delory
*/
public class XspfProvider implements SpecificPlaylistProvider
{
/**
* A list of compatible content types.
*/
private static final ContentType[] FILETYPES =
{
new ContentType(new String[] { ".xspf" },
new String[] { "application/xspf+xml" },
new PlayerSupport[]
{
new PlayerSupport(PlayerSupport.Player.VLC_MEDIA_PLAYER, true, null),
},
"XML Shareable Playlist Format (XSPF)"),
};
@Override
public String getId()
{
return "xspf";
}
@Override
public ContentType[] getContentTypes()
{
return FILETYPES.clone();
}
@Override
public SpecificPlaylist readFrom(final InputStream in, final String encoding, final Log logger) throws Exception
{
String enc = encoding;
if (enc == null)
{
enc = "UTF-8";
}
String str = IOUtils.toString(in, enc); // May throw IOException. Throws NullPointerException if in is null.
// Replace all occurrences of a single '&' with "&" (or leave this construct as is).
// First replace blindly all '&' to its corresponding character reference.
str = str.replace("&", "&");
// Then restore any existing character reference.
str = str.replaceAll("&([a-zA-Z0-9#]+;)", "&$1"); // Shall not throw PatternSyntaxException.
// Unmarshal the WPL playlist.
final XmlSerializer serializer = XmlSerializer.getMapping("chameleon/playlist/xspf"); // May throw Exception.
serializer.getUnmarshaller().setIgnoreExtraElements(true);
final StringReader reader = new StringReader(str);
final SpecificPlaylist ret = (SpecificPlaylist) serializer.unmarshal(reader); // May throw Exception.
ret.setProvider(this);
return ret;
}
@Override
public SpecificPlaylist toSpecificPlaylist(final chameleon.playlist.Playlist playlist) throws Exception
{
final Playlist ret = new Playlist();
ret.setProvider(this);
addToPlaylist(ret, playlist.getRootSequence()); // May throw Exception.
return ret;
}
/**
* Adds the specified generic playlist component, and all its childs if any, to the input track list.
* @param playlist the parent playlist. Shall not be null.
* @param component the generic playlist component to handle. Shall not be null.
* @throws NullPointerException if playlist is null.
* @throws NullPointerException if component is null.
* @throws Exception if this service provider is unable to represent the input playlist.
*/
private void addToPlaylist(final Playlist playlist, final AbstractPlaylistComponent component) throws Exception
{
if (component instanceof Sequence)
{
final Sequence sequence = (Sequence) component;
if (sequence.getRepeatCount() < 0)
{
throw new IllegalArgumentException("An XSPF playlist cannot handle a sequence repeated indefinitely");
}
final AbstractPlaylistComponent[] components = sequence.getComponents();
for (int iter = 0; iter < sequence.getRepeatCount(); iter++)
{
for (AbstractPlaylistComponent c : components)
{
addToPlaylist(playlist, c); // May throw Exception.
}
}
}
else if (component instanceof Parallel)
{
throw new IllegalArgumentException("An XSPF playlist cannot play different media at the same time");
}
else if (component instanceof Media)
{
final Media media = (Media) component;
if (media.getDuration() != null)
{
throw new IllegalArgumentException("An XSPF playlist cannot handle a timed media");
}
if (media.getRepeatCount() < 0)
{
throw new IllegalArgumentException("An XSPF playlist cannot handle a media repeated indefinitely");
}
if (media.getSource() != null)
{
for (int iter = 0; iter < media.getRepeatCount(); iter++)
{
final Track track = new Track(); // NOPMD Avoid instantiating new objects inside loops
final Location location = new Location(); // NOPMD Avoid instantiating new objects inside loops
location.setText(media.getSource().toString());
track.addStringContainer(location);
if (media.getSource().getDuration() > 0L) // NOPMD Deeply nested if..then statements are hard to read
{
track.setDuration((int) media.getSource().getDuration());
}
playlist.addTrack(track);
}
}
}
}
}
