public class Repository2 {
  private DataService _service;

  public Repository2(DataService service) {
    _service = service;
  }

  public InsuranceClaim[] FindClaims(Customer customer) {
    // we're simply going to delegate to the inner
    // DataService for now,but who knows what 
    // we want to do in the future?
    return _service.FindClaims(customer);
  }
}

public class ClassThatNeedsInsuranceClaim2 {
  private Repository2 _repository;

  public ClassThatNeedsInsuranceClaim2(
    Repository2 repository) {
    _repository = repository;
  }

  public void TallyAllTheOutstandingClaims(
    Customer customer) {
    // This line of code now follows the Law of Demeter
    InsuranceClaim[] claims = _repository.FindClaims(customer);
  }
}

public class DumbPurchase {
  public double SubTotal { get; set; }
  public double Discount { get; set; }
  public double Total { get; set; }
}

public class DumbAccount {
  public double Balance { get; set;}
}

public class ClassThatUsesDumbEntities {
  public void MakePurchase(
    DumbPurchase purchase,DumbAccount account) {
    purchase.Discount = purchase.SubTotal > 10000 ? .10 : 0;
    purchase.Total = 
      purchase.SubTotal*(1 - purchase.Discount);

    if (purchase.Total < account.Balance) {
      account.Balance -= purchase.Total;
    }
    else {
      rejectPurchase(purchase,"You don't have enough money.");
    }
  }
} 

public class Purchase {
  private readonly double _subTotal;

  public Purchase(double subTotal) {
    _subTotal = subTotal;
  }

  public double Total {
    get {
      double discount = _subTotal > 10000 ? .10 : 0;
      return _subTotal*(1 - discount);
    }
  }
}

public class Account {
  private double _balance;

  public void Deduct(
    Purchase purchase,PurchaseMessenger messenger) {
    if (purchase.Total < _balance) {
      _balance -= purchase.Total;
    }
    else {
      messenger.RejectPurchase(purchase,this);
    }
  }
}

public class ClassThatObeysTellDontAsk {
  public void MakePurchase(
    Purchase purchase,Account account) {
    PurchaseMessenger messenger = new PurchaseMessenger();
    account.Deduct(purchase,messenger);
  }
}