/**
* Returns a String representation of this submission with the fields separated by &. Order of the
* fields is:<br>
* <tt>artist&track&startTime&Source&RecommendationKey&Rating&length&album&tracknumber</tt><br>
* Note that: - Values may possibly be <code>null</code> or empty - enum values such as Rating and
* Source are <code>null</code> or their constant name is used (i.e. "LOVE") - all string values
* (artist, track, album) are utf8-url-encoded
*
* @return a String
*/
public String toString() {
String b = encode(album != null ? album : "");
String artist = encode(this.artist);
String track = encode(this.track);
String l = length == -1 ? "" : String.valueOf(length);
String n = tracknumber == -1 ? "" : String.valueOf(tracknumber);
String r = "";
if (rating != null) r = rating.name();
String rec = "";
if (recommendationKey != null && source == Source.LAST_FM && recommendationKey.length() == 5)
rec = recommendationKey;
return String.format(
"%s&%s&%s&%s&%s&%s&%s&%s&%s", artist, track, startTime, source.name(), rec, r, l, b, n);
}
