code: package tracks.levelGeneration.constraints;
  
  import java.util.HashMap;
  import tools.GameAnalyzer;
  
  public class AvatarNumberConstraint extends AbstractConstraint{
  
  	/**
  	 * hashmap contains the number of objects for each type
  	 */
  	public HashMap<String, Integer> numOfObjects;
  	/**
  	 * Object for game analyzer
  	 */
  	public GameAnalyzer gameAnalyzer;
  	
  	/**
  	 * Check if there is only 1 avatar in the level
  	 * @return	1 if constraint is staisfied and 0 otherwise
  	 */
  	@Override
  	public double checkConstraint() {
  		int totalAvatars = 0;
  		for(String avatar:gameAnalyzer.getAvatarSprites()){
  			if(numOfObjects.containsKey(avatar)){
  				totalAvatars += numOfObjects.get(avatar);
  			}
  		}
  		
  		return totalAvatars == 1? 1:0;
  	}
  
  }
  