package net.kreatious.pianoleopard.midi.track;
   
   import javax.sound.midi.Track;
   
   import net.kreatious.pianoleopard.intervalset.IntervalSet;
   import net.kreatious.pianoleopard.midi.event.Event;
   import net.kreatious.pianoleopard.midi.event.EventPair;
   import net.kreatious.pianoleopard.midi.event.NoteEvent;
   import net.kreatious.pianoleopard.midi.event.PedalEvent;
  import net.kreatious.pianoleopard.midi.event.TempoCache;
  
  /**
   * Represents a parsed MIDI track with efficient retrieval by time range.
   *
   * @author Jay-R Studer
   */
  class ImmutableParsedTrack implements ParsedTrack {
      private final IntervalSet<EventPair<NoteEvent>> notes;
      private final IntervalSet<EventPair<PedalEvent>> pedals;
  
      /**
       * Constructs a new {@link ImmutableParsedTrack} by parsing the specified
       * {@link Track}.
       *
       * @param track
       *            the MIDI track to parse
       * @param cache
       *            the {@link TempoCache} to convert ticks into microseconds
       */
      ImmutableParsedTrack(Track track, TempoCache cache) {
          notes = new IntervalSet<>();
          pedals = new IntervalSet<>();
          new TrackVisitor() {
              @Override
              @SuppressWarnings("unchecked")
              protected void visitEventPair(EventPair<? extends Event> pair) {
                  if (pair.getOff() instanceof NoteEvent) {
                      notes.put(pair.getOnTime(), pair.getOffTime(), (EventPair<NoteEvent>) pair);
                  } else if (pair.getOff() instanceof PedalEvent) {
                      pedals.put(pair.getOnTime(), pair.getOffTime(), (EventPair<PedalEvent>) pair);
                  }
              }
          }.accept(track, cache);
      }
  
      @Override
      public Iterable<EventPair<NoteEvent>> getNotePairs(long low, long high) {
          return notes.subSet(low, high);
      }
  
      @Override
      public Iterable<EventPair<PedalEvent>> getPedalPairs(long low, long high) {
          return pedals.subSet(low, high);
      }
  }