code: /*
   * Computoser is a music-composition algorithm and a website to present the results
   * Copyright (C) 2012-2014  Bozhidar Bozhanov
   *
   * Computoser 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.
   *
   * Computoser 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 Computoser.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  package com.music;
  
  import java.util.Random;
  
  import com.music.model.Scale;
  import com.music.model.prefs.UserPreferences;
  import com.music.util.music.Chance;
  
  import jm.music.data.Score;
  
  public class ScaleConfigurer implements ScoreManipulator {
      private Random random = new Random();
  
      private int[] SCALE_PERCENTAGES = new int[] {25,23,9,3,4,4,4,4,3,3,3,7,8};
      //private int[] MINOR_SCALE_PERCENTAGES = new int[] {0,45,24,7,14,0,0,0,0,0,0,0,10};
  
      @Override
      public void handleScore(Score score, ScoreContext ctx, UserPreferences prefs) {
          ctx.setScale(prefs != null && prefs.getScale() != null 
                  ? prefs.getScale() 
                  : getRandomScale());
          Scale alternativescale = getRandomScale();
          while (alternativescale == ctx.getScale()) {
              alternativescale = getRandomScale();
          }
          ctx.setAlternativeScale(alternativescale);
  
          @SuppressWarnings("unused")
          int keyNote = random.nextInt(12);
  
          //ctx.setKeyNote(keyNote);
      }
  
      private Scale getRandomScale() {
          Scale[] scales = Scale.values();
          return scales[Chance.choose(SCALE_PERCENTAGES)];
      }
  }
  