test.java

interface ValueHolder {

  Object getValue();
}

//param
traversableResolver.isReachable(
  new ValueHolderImpl(param0),
  Node("arg0", ElementType.Kind.PARAMETER),
  Gentleman.class,
  path, // Node("wearSuit", Kind.METHOD)
  elementType.PARAMETER);
  

//top bean
traversableResolver.isReachable(
  new ValueHolderImpl(topBean),
  Node(null, ElementType.Kind.BEAN),
  TopBean.class,
  emptyPath,
  elementType.TYPE //or should it be null
  );
  
  
public class JPATraversableResolver implements TraversableResolver {

    public boolean isReachable(Object traversableObject, 
                               Path.Node traversableProperty, 
                               Class<?> rootBeanType, 
                               Path pathToTraversableObject, 
                               ElementType elementType) {
        ElementDescriptor.Kind kind = traversableProperty.getelementType().getKind();
        if (trabversableObject == null) {
          return true;
        }
        else if ( kind == ElementDescriptor.Kind.PARAMETER || kind == ElementDescriptor.Kind.RETURN_VALUE ) {
          return Persistence.getPersistenceUtil().isLoaded( ( (ValueHolder) traversableObject ).getValue() );
        }
        else {
          return traversableObject == null ||
                Persistence.getPersistenceUtil().isLoaded( 
                        traversableObject, 
                        traversableProperty.getName() );
        }
    }

    public boolean isCascadable(Object traversableObject, 
                               Path.Node traversableProperty, 
                               Class<?> rootBeanType, 
                               Path pathToTraversableObject, 
                               ElementType elementType) {
        return true;
    }
}




public class JPATraversableResolver implements TraversableResolver {
 
    public boolean isReachable(Object traversableObject, 
                               Path.Node traversableProperty, 
                               Class<?> rootBeanType, 
                               Path pathToTraversableObject, 
                               ElementType elementType) {
        ElementDescriptor.Kind kind = traversableProperty.getelementType().getKind();
        if (trabversableObject == null) {
          return true;
        }
        else if ( kind == ElementDescriptor.Kind.PARAMETER || kind == ElementDescriptor.Kind.RETURN_VALUE ) {
          return true;
        }
        else {
          return traversableObject == null ||
                Persistence.getPersistenceUtil().isLoaded( 
                        traversableObject, 
                        traversableProperty.getName() );
        }
    }
 
    public boolean isCascadable(Object traversableObject, 
                               Path.Node traversableProperty, 
                               Class<?> rootBeanType, 
                               Path pathToTraversableObject, 
                               ElementType elementType) {
        ElementDescriptor.Kind kind = traversableProperty.getelementType().getKind();
        if ( kind == ElementDescriptorKind.PARAMETER || ElementDescriptor.kind == Kind.RETURN_VALUE ) {
          return Persistence.getPersistenceUtil().isLoaded( ( (ValueHolder) traversableObject ).getValue() );
        }
        else {
          return true;
        }
    }
}