@Override
  public int fieldMetaIndex( int index ) {
    if ( index >= size() || index < 0 ) {
      return FIELD_DOES_NOT_EXIST;
    }
    return actualToMetaFieldMapping[index];
  }
@Test
  public void fieldMetaIndex() {
    assertEquals( 3, fieldsMapping.fieldMetaIndex( 0 ) );
  }