code: package de.tu_darmstadt.stg.mudetect.ranking;
  
  import de.tu_darmstadt.stg.mudetect.aug.model.Node;
  
  import java.util.Collection;
  
  public interface NodeWeightFunction {
      double getWeight(Node node);
  
      default double getWeight(Collection<Node> nodes) {
          return nodes.stream().mapToDouble(this::getWeight).sum();
      }
  
      default double getInverseWeight(Node node) {
          return 1 / getWeight(node);
      }
  
      default double getInverseWeight(Collection<Node> nodes) { return nodes.stream().mapToDouble(this::getInverseWeight).sum(); }
  }
  