Android Open Source - Musicdroid Note Event List To Symbol Converter

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License

The source code is released under:

GNU General Public License

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Java Source Code

/**
 *  Catroid: An on-device visual programming system for Android devices
 *  Copyright (C) 2010-2013 The Catrobat Team
 *  (<http://developer.catrobat.org/credits>)
 */*from  www  .j  av  a2  s  .com*/
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as
 *  published by the Free Software Foundation, either version 3 of the
 *  License, or (at your option) any later version.
 *
 *  An additional term exception under section 7 of the GNU Affero
 *  General Public License, version 3, is available at
 *  http://developer.catrobat.org/license_additional_term
 *
 *  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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.catrobat.musicdroid.pocketmusic.note.symbol;

import org.catrobat.musicdroid.pocketmusic.note.NoteEvent;
import org.catrobat.musicdroid.pocketmusic.note.NoteLength;
import org.catrobat.musicdroid.pocketmusic.note.NoteName;

import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

public class NoteEventListToSymbolConverter {

  private long lastTick;
  private Map<NoteName, Long> openNotes;
  private Symbol currentSymbol;

  public NoteEventListToSymbolConverter() {
    lastTick = 0;
    openNotes = new HashMap<NoteName, Long>();
    currentSymbol = null;
  }

  public List<Symbol> convertNoteEventList(long tick, List<NoteEvent> noteEvents) {
    List<Symbol> symbols = new LinkedList<Symbol>();

    for (NoteEvent noteEvent : noteEvents) {
      NoteName noteName = noteEvent.getNoteName();

      if (noteEvent.isNoteOn()) {
        if (lastTick != tick) {
          NoteLength noteLength = NoteLength.getNoteLengthFromTickDuration(tick - lastTick);
          symbols.add(new BreakSymbol(noteLength));
        }

        if (openNotes.isEmpty()) {
          currentSymbol = new NoteSymbol();
        }

        openNotes.put(noteName, tick);
      } else {
        long lastTickForNote = openNotes.get(noteName);
        NoteLength noteLength = NoteLength.getNoteLengthFromTickDuration(tick - lastTickForNote);

        if (currentSymbol instanceof NoteSymbol) {
          ((NoteSymbol) currentSymbol).addNote(noteName, noteLength);
        }

        openNotes.remove(noteName);

        if (false == symbols.contains(currentSymbol)) {
          symbols.add(currentSymbol);
        }
      }

      lastTick = tick;
    }

    return symbols;
  }
}

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