* forward to this implementation.
   */
  protected @Nullable Entry<K, V> standardFirstEntry() {
    return Iterables.<@Nullable Entry<K, V>>getFirst(entrySet(), null);
  }

  /**
   * A sensible definition of {@link #firstKey} in terms of {@code firstEntry}. If you override
   * {@code firstEntry}, you may wish to override {@code firstKey} to forward to this

        // With depth limit set to 2, depth 10 should return empty arrays
        Pair<String[], String[]> result = authenticator.getParentGroup(null, "test-id", 10);
        assertNotNull(result);
        assertEquals(0, result.getFirst().length);
        assertEquals(0, result.getSecond().length);
    }

    @Test
    public void test_getParentGroup_exactlyAtDepthLimit() {
        EntraIdAuthenticator authenticator = new EntraIdAuthenticator();

        if (applicables.isEmpty()) {
            return null;
        }

        if (applicables.size() == 1) {
            return applicables.getFirst();
        }

        // This list will contain the maximally specific methods. Hopefully at
        // the end of the below loop, the list will contain exactly one method,

  public void testGetFirst_withDefault_singleton() {
    Iterable<String> iterable = singletonList("foo");
    assertThat(Iterables.getFirst(iterable, "bar")).isEqualTo("foo");
  }

  public void testGetFirst_withDefault_empty() {
    Iterable<String> iterable = emptyList();
    assertThat(Iterables.getFirst(iterable, "bar")).isEqualTo("bar");
  }

  public void testGetFirst_withDefault_empty_null() {

                }
            }
            throw new UnsupportedOperationException();
        }

        @Override
        void onEndHtmlElement(String name) {
            if (!tagStack.isEmpty() && tagStack.getFirst().equals(name)) {
                tagStack.removeFirst();
                handlerStack.removeFirst().onEndElement(name);
            }
        }

        @Override
        void onStartJavadocTag(String name) {

                value = value.replace("${" + entry.getKey() + "}", entry.getValue());
            }
            return new Pair<>(key, value);
        }).collect(Collectors.toMap(Pair<String, String>::getFirst, Pair<String, String>::getSecond));
        final Map<String, String> configScriptMap = config.getHandlerScriptMap();

        initParamMap.putAll(configParamMap);
        final DataStoreParams paramMap = initParamMap;

                    appendJson("search-field", searchFieldMap, buf).append(',');
                    final Map<String, List<String>> requestHeaderMap = entity.getRequestHeaderList()
                            .stream()

            jspItems.add(new Pair<>(":" + p.getFirst(), "/" + p.getSecond()));
        }
        for (String key : ComponentUtil.getVirtualHostHelper().getVirtualHostPaths()) {
            if (StringUtil.isBlank(key)) {
                key = "/";
            }
            for (final Pair<String, String> p : systemHelper.getDesignJspFileNames()) {
                jspItems.add(new Pair<>(key + ":" + p.getFirst(), key + "/" + p.getSecond()));
            }

            }
        })));
        getQueryFieldConfig().additionalDefaultList.stream().forEach(f -> {
            final QueryBuilder query = builder.apply(f.getFirst(), f.getSecond());
            defaultQuery.add(query);
        });
        return defaultQuery;
    }

    /**
     * Creates a default query builder based on the configured query type.

            }
            return new Pair<>(k, v);
        }).forEach(e -> {
            if (buf.length() > 0) {
                buf.append('\n');
            }
            buf.append(e.getFirst());
            buf.append('=');
            buf.append(e.getSecond());
        });
        return buf.toString();
    }

    /**
     * Loads configuration parameters into a map.
     *