code: package de.tu_darmstadt.stg.mustudies;
  
  import com.google.common.collect.HashMultiset;
  import com.google.common.collect.Multiset;
  import de.tu_darmstadt.stg.mudetect.aug.model.APIUsageGraph;
  
  import java.util.Collection;
  
  public class UsageUtils {
      public static Multiset<String> countNumberOfUsagesPerType(Collection<? extends APIUsageGraph> usageGraphs) {
          HashMultiset<String> numberOfUsagesPerType = HashMultiset.create();
          for (APIUsageGraph usageGraph : usageGraphs) {
              numberOfUsagesPerType.addAll(usageGraph.getAPIs());
          }
          return numberOfUsagesPerType;
      }
  }
  