}

  @Override
  public int count(@Nullable Object element) {
    @Nullable ImmutableEntry<?>[] hashTable = this.hashTable;
    if (element == null || hashTable.length == 0) {
      return 0;
    }
    int hash = smearedHash(element);
    int mask = hashTable.length - 1;
    for (ImmutableEntry<?> entry = hashTable[hash & mask];
        entry != null;
        entry = entry.nextInBucket()) {

        this.hashTable = hashTable;
        int mask = hashTable.length - 1;
        for (ValueEntry<K, V> entry = firstEntry;
            entry != null;
            entry = entry.successorInValueSet) {
          int bucket = entry.smearedValueHash & mask;
          entry.nextInValueBucket = hashTable[bucket];
          hashTable[bucket] = entry;
        }
      }
    }

    @CanIgnoreReturnValue

        this.hashTable = hashTable;
        int mask = hashTable.length - 1;
        for (ValueEntry<K, V> entry = firstEntry;
            entry != null;
            entry = entry.successorInValueSet) {
          int bucket = entry.smearedValueHash & mask;
          entry.nextInValueBucket = hashTable[bucket];
          hashTable[bucket] = entry;
        }
      }
    }

    @CanIgnoreReturnValue

          int index = j & mask;
          if (hashTable[index] == null) {
            hashTable[index] = e;
            break;
          }
        }
      }
      return hashTable;
    }

    void ensureTableCapacity(int minCapacity) {
      int newTableSize;
      if (hashTable == null) {
        newTableSize = chooseTableSize(minCapacity);
        hashTable = new Object[newTableSize];

    }
  }

  /**
   * Returns a larger power of 2 hashtable size given the current mask.
   *
   * <p>For hashtable sizes less than or equal to 32, the returned power of 2 is 4x the current
   * hashtable size to reduce expensive rehashing. Otherwise the returned power of 2 is 2x the
   * current hashtable size.
   */
  static int newCapacity(int mask) {
    return ((mask < 32) ? 4 : 2) * (mask + 1);

          ImmutableSet<E> result;
          if (hashTable != null && chooseTableSize(size) == hashTable.length) {
            @Nullable Object[] uniqueElements =
                shouldTrim(size, contents.length) ? Arrays.copyOf(contents, size) : contents;
            result =
                new RegularImmutableSet<E>(
                    uniqueElements, hashCode, hashTable, hashTable.length - 1, size);
          } else {

     * @return The environment for LDAP connection.
     */
    protected Hashtable<String, String> createEnvironment(final String initialContextFactory, final String securityAuthentication,
            final String providerUrl, final String principal, final String credntials) {
        final Hashtable<String, String> env = new Hashtable<>();
        putEnv(env, Context.INITIAL_CONTEXT_FACTORY, initialContextFactory);

    }
  }

  /**
   * Returns a larger power of 2 hashtable size given the current mask.
   *
   * <p>For hashtable sizes less than or equal to 32, the returned power of 2 is 4x the current
   * hashtable size to reduce expensive rehashing. Otherwise the returned power of 2 is 2x the
   * current hashtable size.
   */
  static int newCapacity(int mask) {
    return ((mask < 32) ? 4 : 2) * (mask + 1);

        // Test getEnvironment returns the correct environment
        Hashtable<String, String> env = ldapUser.getEnvironment();
        assertSame(testEnv, env);
        assertEquals("test.value", env.get("test.key"));

        // Test with empty environment
        Hashtable<String, String> emptyEnv = new Hashtable<>();
        LdapUser user = new LdapUser(emptyEnv, "user");

            new TestStringMapGenerator() {
              @Override
              // We are testing Hashtable / testing our tests on Hashtable.
              @SuppressWarnings("JdkObsolete")
              protected Map<String, String> create(Entry<String, String>[] entries) {
                return populate(new Hashtable<String, String>(), entries);
              }
            })
        .withFeatures(