Java nested data structure extractors

Extractors.java

/**
   * Will extract nested property from value, if it is not null
   *
   * @param value     source value
   * @param extractor extractor function for getting desired nested property from value.
   * @param <A>       type of the source value
   * @param <B>       type of the target nested property
   * @return target nested property from value or null.
   */
  public static <A, B> B getOrNull(A value, Function<A, B> extractor) {
    if (value != null) {
      return extractor.apply(value);
    }

    return null;
  }

  /**
   * Will extract nested property from value, if all the values in the chain are not null
   *
   * @param value      source value
   * @param extractor1 extractor function for getting intermediate nested property.
   * @param extractor2 extractor function for getting desired nested property from value.
   * @param <A>        type of the source value
   * @param <B>        type of the intermediate property
   * @param <C>        type of the target nested property
   * @return target nested property from value or null.
   */
  public static <A, B, C> C getOrNull(A value, Function<A, B> extractor1, Function<B, C> extractor2) {
    if (value != null) {
      return getOrNull(extractor1.apply(value), extractor2);
    }

    return null;
  }

  /**
   * Will extract nested property from value, if all the values in the chain are not null
   *
   * @param value      source value
   * @param extractor1 extractor function for getting next intermediate nested property.
   * @param extractor2 extractor function for getting next intermediate nested property.
   * @param extractor3 extractor function for getting desired nested property from value.
   * @param <A>        type of the source value
   * @param <B>        type of the intermediate property
   * @param <C>        type of the intermediate property
   * @param <D>        type of the target nested property
   * @return target nested property from value or null.
   */
  public static <A, B, C, D> D getOrNull(A value,
                                         Function<A, B> extractor1,
                                         Function<B, C> extractor2,
                                         Function<C, D> extractor3) {

    if (value != null) {
      return getOrNull(extractor1.apply(value), extractor2, extractor3);
    }

    return null;
  }