* `get()`, but that is vanishingly unlikely.
     */
    return ref == null ? Optional.absent() : Optional.fromNullable(enumClass.cast(ref.get()));
  }

  static String formatCompact4Digits(double value) {
    return String.format(Locale.ROOT, "%.4g", value);
  }

  static boolean stringIsNullOrEmpty(@Nullable String string) {
    return string == null || string.isEmpty();
  }

  /**

        regA(builder);
        return builder;
    }

    protected PercentileRanksAggregationBuilder regPercentileRanksA(String name, String field, double[] values) {
        PercentileRanksAggregationBuilder builder = AggregationBuilders.percentileRanks(name, values).field(field);
        regA(builder);
        return builder;
    }

        Map<String, Object> sourceMap = new HashMap<>();
        sourceMap.put("string", "test");
        sourceMap.put("integer", 42);
        sourceMap.put("long", 100L);
        sourceMap.put("double", 3.14);
        sourceMap.put("boolean", false);
        sourceMap.put("null_value", null);
        sourceMap.put("nested", nestedMap);

        event.setSourceMap(sourceMap);

    assertTrue(service.shutDownCalled);
    assertEquals(Service.State.FAILED, service.state());
    assertThat(expected.getCause().getSuppressed()[0]).hasMessageThat().isEqualTo("double kaboom!");
  }

  private class ThrowOnRunService extends AbstractExecutionThreadService {
    private boolean shutDownCalled = false;
    private boolean throwOnShutDown = false;

    @Override

                "8-:-Dfile.encoding=UTF-8", "17-:-XX:+UseStringDeduplication" };

        String[] result = JvmUtil.filterJvmOptions(args);
        assertEquals(3, result.length);
        assertEquals("-XX:OnOutOfMemoryError=\"kill -9 %p\"", result[0]);
        assertEquals("-Djava.awt.headless=true", result[1]);
        assertEquals("-Dfile.encoding=UTF-8", result[2]);
    }

                sb.append(" -Dclassifier=");
                sb.append(classifier);
            }
            sb.append(" -Dpackaging=");
            sb.append(type);
            sb.append(" -Dfile=/path/to/file");
            sb.append(LS);

            // If people want to deploy it
            sb.append(LS);
            sb.append(indentation);

  }

  // This is all essentially copied from ImmutableSet, but we have to duplicate because
  // of dependencies.

  // Represents how tightly we can pack things, as a maximum.
  private static final double DESIRED_LOAD_FACTOR = 0.5;

  /**
   * Returns an array size suitable for the backing array of a hash table that uses open addressing

     *
     * @return The underlying file, never {@code null}.
     * @deprecated Use {@link #getPath()} instead.
     */
    @Deprecated
    public File getFile() {
        return path.toFile();
    }

    /**
     * Gets the file of this source.
     *
     * @return The underlying file, never {@code null}.
     * @since 4.0.0
     */
    public Path getPath() {
        return path;
    }

        /** Number of initializing shards */
        public int initializingShards;
        /** Number of relocating shards */
        public int relocatingShards;
        /** Percentage of active shards */
        public double activeShardsPercent;
        /** Number of active shards */
        public int activeShards;
        /** Number of active primary shards */
        public int activePrimaryShards;
        /** Number of data nodes */

        s2.close();
    }

    @Test
    @DisplayName("DFS referrals: invalid double-slash prefix triggers exception")
    void dfsReferrals_invalidPath() {
        CIFSException ex = assertThrows(CIFSException.class, () -> transport.getDfsReferrals(ctx, "\\\\server\\share", null, null, 1));
        assertTrue(ex.getMessage().contains("double slash"));
    }

    @Nested
    @MockitoSettings(strictness = Strictness.LENIENT)