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  package org.apache.cayenne.reflect;
  
  import org.apache.cayenne.Fault;
  import org.apache.cayenne.access.ToManyListFault;
  import org.apache.cayenne.access.ToManyMapFault;
  import org.apache.cayenne.access.ToManySetFault;
  import org.apache.cayenne.access.ToOneFault;
  
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * @since 3.0
   */
  public class SingletonFaultFactory implements FaultFactory {
  
      protected Fault toOneFault = new ToOneFault();
      protected Fault listFault = new ToManyListFault();
      protected Fault setFault = new ToManySetFault();
      protected Map<Accessor, Fault> mapFaults = new HashMap<>();
  
      public Fault getCollectionFault() {
          return listFault;
      }
  
      public Fault getListFault() {
          return listFault;
      }
      
      public Fault getMapFault(Accessor mapKeyAccessor) {
          synchronized (mapFaults) {
              Fault fault = mapFaults.get(mapKeyAccessor);
  
              if (fault == null) {
                  fault = new ToManyMapFault(mapKeyAccessor);
                  mapFaults.put(mapKeyAccessor, fault);
              }
  
              return fault;
          }
      }
  
      public Fault getSetFault() {
          return setFault;
      }
  
      public Fault getToOneFault() {
          return toOneFault;
      }
  }
  