docs: public void postConstruct() {
          Assert.equals(NUMBER_OF_EXTENT_COORDS, this.maxExtent.length,
                        "maxExtent must have exactly 4 elements to the array.  Was: " +
                                Arrays.toString(this
                                                        .maxExtent));
          Assert.equals(2, this.tileSize.length,
                        "tileSize must have exactly 2 elements to the array.  Was: " +
                                Arrays.toString(this.tileSize));
          Assert.isTrue(this.resolutions.length > 0, "resolutions must have at least one value");
  
          Arrays.sort(this.resolutions, Collections.reverseOrder());
          Assert.isTrue(validateBaseUrl(), "invalid baseURL");
      }