code: @Override
      Resource getResource(final String relativePath) {
          return allResourcePaths.contains(relativePath) ? newResource(relativePath) : null;
      }
docs: Get the {@link Resource} for a given relative path.
  
  @param relativePath
  The relative path of the {@link Resource} to return.
  @return The {@link Resource} for the given relative path, or null if relativePath does not exist in this
  classpath element.