//                                                                           =========
    private static final UserDbm _instance = new UserDbm();

    private UserDbm() {
    }

    public static UserDbm getInstance() {
        return _instance;
    }

    // ===================================================================================

    boolean isAllowCompound(String command);

    /**
     * Machine identifier
     *
     * ClientGuid, ... are derived from this value.
     *
     * Normally this should be randomly assigned for each client instance/configuration.
     *
     * @return machine identifier (32 byte)
     */
    byte[] getMachineId();

    /**
     *
     *

   * for {@code minimumBits}, will return identically-behaving {@link HashFunction} instances.
   *
   * @param minimumBits a positive integer. This can be arbitrarily large. The returned {@link
   *     HashFunction} instance may use memory proportional to this integer.
   * @return a hash function, described above, that produces hash codes of length {@code

        assertEquals("inurl", QueryFieldConfig.INURL_FIELD);
        assertEquals("score", QueryFieldConfig.SCORE_SORT_VALUE);
    }

    public void test_constructor() {
        // Test that constructor creates a valid instance
        QueryFieldConfig config = new QueryFieldConfig();
        assertNotNull(config);

        // Verify initial state (fields should be null before init)
        assertNull(config.responseFields);

		f.saveCall(x, context)
	}
}

// Save references to C.xxx for later processing.
func (f *File) saveRef(n *ast.Expr, context astContext) {
	sel := (*n).(*ast.SelectorExpr)
	// For now, assume that the only instance of capital C is when
	// used as the imported package identifier.
	// The parser should take care of scoping in the future, so
	// that we will be able to distinguish a "top-level C" from a
	// local C.

            }
        }
        return false;
    }

    /**
     * Creates a new LDAP user instance with the specified username and environment.
     *
     * @param username the username for the LDAP user
     * @param env the environment configuration for LDAP connection
     * @return a new LdapUser instance
     */
    protected LdapUser createLdapUser(final String username, final Hashtable<String, String> env) {

  private static final class NodeAndRemainingSuccessors<N> {
    final N node;

    /**
     * The successors left to be visited, or {@code null} if we just added this {@code
     * NodeAndRemainingSuccessors} instance to the stack. In the latter case, we'll compute the
     * successors if we determine that we need them after we've performed the initial processing of
     * the node.
     */
    @Nullable Queue<N> remainingSuccessors;

  private static final class NodeAndRemainingSuccessors<N> {
    final N node;

    /**
     * The successors left to be visited, or {@code null} if we just added this {@code
     * NodeAndRemainingSuccessors} instance to the stack. In the latter case, we'll compute the
     * successors if we determine that we need them after we've performed the initial processing of
     * the node.
     */
    @Nullable Queue<N> remainingSuccessors;

                                mergeResponseData(dataMap, responseDataMap);
                            } catch (final Exception e) {
                                throw new CrawlerSystemException("Could not create an instance from bytes.", e);
                            }
                        }
                    }
                    crawlerStatsHelper.record(keyObj, StatsAction.ACCESSED);

                    // remove

        }
    }

    static String DEFAULT_DOMAIN;
    static String DEFAULT_USERNAME;
    static String DEFAULT_PASSWORD;
    static final String BLANK = "";

    /**
     * Anonymous credentials instance with empty domain, username, and password.
     */
    public static final NtlmPasswordAuthentication ANONYMOUS = new NtlmPasswordAuthentication("", "", "");

    static void initDefaults() {