docs: @Override
      public ICodeBaseEntry lookupResource(String resourceName) {
          // Translate resource name, in case a resource name
          // has been overridden and the resource is being accessed
          // using the overridden name.
          resourceName = translateResourceName(resourceName);
  
          File file = getFullPathOfResource(resourceName);
          if (!file.exists()) {
              return null;
          }
          return new DirectoryCodeBaseEntry(this, resourceName);
      }