package javazoom.jlGui.playlist;

/**
 * Playlist.
 *
 *-----------------------------------------------------------------------
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *----------------------------------------------------------------------
 */

import java.util.Collection;

/**
 * Playlist.
 * This interface defines method that a playlist should implement.<br>
 * A playlist provides a collection of item to play and a cursor to know
 * which item is playing.
 *
 * @author	E.B from JavaZOOM
 *
 * Homepage : http://www.javazoom.net
 */
public interface Playlist
{
	// Next methods will be called by the Playlist UI.

	/**
	 * Loads playlist.
	 */
	public void load(String filename);
	/**
	 * Saves playlist.
	 */
	public void save(String filename);
	/**
	 * Adds item at a given position in the playlist.
	 */
	public void addItemAt(PlaylistItem pli, int pos);
	/**
	 * Searchs and removes item from the playlist.
	 */
	public void removeItem(PlaylistItem pli);
	/**
	 * Removes item at a given position from the playlist.
	 */
	public void removeItemAt(int pos);
	/**
	 * Append item at the end of the playlist.
	 */
	public void appendItem(PlaylistItem pli);
	/**
	 * Sorts items of the playlist.
	 */
	public void sortItems(int sortmode);
	/**
	 * Returns item at a given position from the playlist.
	 */
	public PlaylistItem getItemAt(int pos);
	/**
	 * Returns a collection of playlist items.
	 */
	public Collection getAllItems();
	/**
	 * Returns then number of items in the playlist.
	 */
	public int getPlaylistSize();

    // Next methods will be used by the Player

	/**
	 * Randomly re-arranges the playlist.
	 */
	public void shuffle();
	/**
	 * Returns item matching to the cursor.
	 */
	public PlaylistItem getCursor();
	/**
	 * Computes cursor position (next).
	 */
	public void nextCursor();
	/**
	 * Computes cursor position (previous).
	 */
	public void previousCursor();
}