java-design-patterns/special-case/src/main/java/com/iluwatar/specialcase/ApplicationServicesImpl.java

package com.iluwatar.specialcase;

public class ApplicationServicesImpl implements ApplicationServices {

  private DomainServicesImpl domain = new DomainServicesImpl();

  @Override
  public ReceiptViewModel loggedInUserPurchase(String userName, String itemName) {
    if (isDownForMaintenance()) {
      return new DownForMaintenance();
    }
    return this.domain.purchase(userName, itemName);
  }

  private boolean isDownForMaintenance() {
    return MaintenanceLock.getInstance().isLock();
  }
}