return false;
  }

  @Override
  public T get() {
    throw new IllegalStateException("Optional.get() cannot be called on an absent value");
  }

  @Override
  public T or(T defaultValue) {
    return checkNotNull(defaultValue, "use Optional.orNull() instead of Optional.or(null)");
  }

  @SuppressWarnings("unchecked") // safe covariant cast
  @Override
  public Optional<T> or(Optional<? extends T> secondChoice) {

  }

  @Override
  public boolean isPresent() {
    return true;
  }

  @Override
  public T get() {
    return reference;
  }

  @Override
  public T or(T defaultValue) {
    checkNotNull(defaultValue, "use Optional.orNull() instead of Optional.or(null)");
    return reference;
  }

  @Override
  public Optional<T> or(Optional<? extends T> secondChoice) {
    checkNotNull(secondChoice);

          <description>The type of layout this repository uses for locating and storing artifacts - can be "legacy" or
            "default".</description>
          <type>String</type>
          <defaultValue>default</defaultValue>
        </field>
      </fields>
      <codeSegments>
        <codeSegment>
          <version>1.0.0</version>
          <code><![CDATA[
            public boolean equals( Object obj )

}

// Comment returns the comment of current column.
func (ct ColumnType) Comment() (value string, ok bool) {
	return ct.CommentValue.String, ct.CommentValue.Valid
}

// DefaultValue returns the default value of current column.
func (ct ColumnType) DefaultValue() (value string, ok bool) {
	return ct.DefaultValueValue.String, ct.DefaultValueValue.Valid

        // v1 == 0.
        .optional(defaultValue = 0),
      Adapters.INTEGER_AS_BIG_INTEGER,
      algorithmIdentifier,
      name,
      validity,
      name,
      subjectPublicKeyInfo,
      Adapters.BIT_STRING.withTag(tag = 1L).optional(),
      Adapters.BIT_STRING.withTag(tag = 2L).optional(),
      extension.asSequenceOf().withExplicitBox(tag = 3).optional(defaultValue = listOf()),
      decompose = {

    private DocumentUtil() {
    }

    public static <T> T getValue(final Map<String, Object> doc, final String key, final Class<T> clazz, final T defaultValue) {
        final T value = getValue(doc, key, clazz);
        if (value == null) {
            return defaultValue;
        }
        return value;
    }

    @SuppressWarnings("unchecked")

          <version>1.1.0+</version>
          <defaultValue>self-first</defaultValue>
          <required>false</required>
          <type>String</type>
        </field>
        <field>
          <name>configuration</name>
          <version>1.2.0+</version>

	columnType, err := findColumnType(tableName, "content")
	AssertEqual(t, err, nil)

	defVal, ok := columnType.DefaultValue()
	AssertEqual(t, defVal, "null")
	AssertEqual(t, ok, true)

	columnType2, err := findColumnType(tableName, "active")
	AssertEqual(t, err, nil)

	defVal, ok = columnType2.DefaultValue()
	bv, _ := strconv.ParseBool(defVal)
	AssertEqual(t, bv, false)
	AssertEqual(t, ok, true)

			},
		},
		ReflectValue: reflect.ValueOf(dest),
		Dest:         dest,
	}

	stmt.Schema = s

	values := ConvertToCreateValues(stmt)
	expected := clause.Values{
		// column has value + defaultValue column has value (which should have a stable order)
		Columns: []clause.Column{{Name: "name"}, {Name: "email"}, {Name: "age"}, {Name: "id"}},
		Values: [][]interface{}{
			{"alice", "email", 18, 1},
			{"bob", "email", 19, 2},

          <version>1.0.0</version>
          <name>editable</name>
          <description>Whether the value of this expression can be changed.</description>
          <type>boolean</type>
          <defaultValue>true</defaultValue>
        </field>
      </fields>
    </class>
  </classes>