本文整理了Java中io.vavr.control.Option类的一些代码示例，展示了Option类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Option类的具体详情如下：
包路径：io.vavr.control.Option
类名称：Option

Option介绍

[英]Replacement for java.util.Optional.

Option is a monadic container type which represents an optional value. Instances of Option are either an instance of Some or the singleton None.

Most of the API is taken from java.util.Optional. A similar type can be found in Haskell and Scala.
[中]java的替代品。util。可选择的
选项是一个{$0$}容器类型，它表示一个可选值。Option的实例可以是Some的实例，也可以是singleton None的实例。
大部分API都来自java。util。可选择的类似的类型可以在Haskell和{$2$}中找到。

代码示例

代码示例来源：origin: vavr-io/vavr

@SuppressWarnings("unchecked")
static <K, V, M extends Map<K, V>> Tuple2<Option<V>, M> computeIfPresent(M map, K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
  final Option<V> value = map.get(key);
  if (value.isDefined()) {
    final V newValue = remappingFunction.apply(key, value.get());
    final M newMap = (M) map.put(key, newValue);
    return Tuple.of(Option.of(newValue), newMap);
  } else {
    return Tuple.of(Option.none(), map);
  }
}

代码示例来源：origin: vavr-io/vavr

/**
 * Folds either the {@code None} or the {@code Some} side of the Option value.
 *
 * @param ifNone  maps the left value if this is a None
 * @param f maps the value if this is a Some
 * @param <U>         type of the folded value
 * @return A value of type U
 */
default <U> U fold(Supplier<? extends U> ifNone, Function<? super T, ? extends U> f) {
  return this.<U>map(f).getOrElse(ifNone);
}

代码示例来源：origin: vavr-io/vavr

@Deprecated
@Override
default V apply(K key) {
  return get(key).getOrElseThrow(() -> new NoSuchElementException(String.valueOf(key)));
}

代码示例来源：origin: vavr-io/vavr

/**
 * Creates a new {@code Option} of a given value.
 *
 * @param value A value
 * @param <T>   type of the value
 * @return {@code Some(value)} if value is not {@code null}, {@code None} otherwise
 */
static <T> Option<T> of(T value) {
  return (value == null) ? none() : some(value);
}

代码示例来源：origin: vavr-io/vavr

/**
 * Returns the value if this is a {@code Some} or the {@code other} value if this is a {@code None}.
 * <p>
 * Please note, that the other value is eagerly evaluated.
 *
 * @param other An alternative value
 * @return This value, if this Option is defined or the {@code other} value, if this Option is empty.
 */
@Override
default T getOrElse(T other) {
  return isEmpty() ? other : get();
}

代码示例来源：origin: vavr-io/vavr

/**
 * Maps the value and wraps it in a new {@code Some} if this is a {@code Some}, returns {@code None}.
 *
 * @param mapper A value mapper
 * @param <U>    The new value type
 * @return a new {@code Some} containing the mapped value if this Option is defined, otherwise {@code None}, if this is empty.
 */
@Override
default <U> Option<U> map(Function<? super T, ? extends U> mapper) {
  Objects.requireNonNull(mapper, "mapper is null");
  return isEmpty() ? none() : some(mapper.apply(get()));
}

代码示例来源：origin: vavr-io/vavr

/**
 * Alias for {@link Option#of(Object)}
 *
 * @param <T>   type of the value
 * @param value A value
 * @return {@link Option.Some} if value is not {@code null}, {@link Option.None} otherwise
 */
public static <T> Option<T> Option(T value) {
  return Option.of(value);
}

代码示例来源：origin: vavr-io/vavr

/**
 * Returns {@code Some(value)} if this is a {@code Some} and the value satisfies the given predicate.
 * Otherwise {@code None} is returned.
 *
 * @param predicate A predicate which is used to test an optional value
 * @return {@code Some(value)} or {@code None} as specified
 */
default Option<T> filter(Predicate<? super T> predicate) {
  Objects.requireNonNull(predicate, "predicate is null");
  return isEmpty() || predicate.test(get()) ? this : none();
}

代码示例来源：origin: resilience4j/resilience4j

private Option<V> getValueFromCache(K cacheKey){
  try {
    Option<V> result = Option.of(cache.get(cacheKey));
    if (result.isDefined()) {
      onCacheHit(cacheKey);
      return result;
    } else {
      onCacheMiss(cacheKey);
      return result;
    }
  }catch (Exception exception){
    LOG.warn("Failed to get a value from Cache {}", getName(), exception);
    onError(exception);
    return Option.none();
  }
}

代码示例来源：origin: vavr-io/vavr

/**
 * Applies an action to this value, if this option is defined, otherwise does nothing.
 *
 * @param action An action which can be applied to an optional value
 * @return this {@code Option}
 */
@Override
default Option<T> peek(Consumer<? super T> action) {
  Objects.requireNonNull(action, "action is null");
  if (isDefined()) {
    action.accept(get());
  }
  return this;
}

代码示例来源：origin: vavr-io/vavr

/**
 * Turns this map from a partial function into a total function that
 * returns defaultValue for all keys absent from the map.
 *
 * @param defaultValue default value to return for all keys not present in the map
 * @return a total function from K to T
 * @deprecated Will be removed
 */
@Deprecated
default Function1<K, V> withDefaultValue(V defaultValue) {
  return k -> get(k).getOrElse(defaultValue);
}

代码示例来源：origin: com.pragmaticobjects.oo.atom/atom-basis

@Override
  public final boolean matches(final TypeDescription target) {
    boolean truth = matcher.matches(target);
    if(!truth) {
      truth = Option.of(target.getSuperClass())
        .map(TypeDescription.Generic::asErasure)
        .map(this::matches)
        .getOrElse(false);
    }
    return truth;
  }
}

代码示例来源：origin: vavr-io/vavr

/**
 * Matches each element with a unique key that you extract from it.
 * If the same key is present twice, the function will return {@code None}.
 *
 * @param getKey A function which extracts a key from elements
 * @param <K>    key class type
 * @return A Map containing the elements arranged by their keys.
 * @throws NullPointerException if {@code getKey} is null.
 * @see #groupBy(Function)
 */
default <K> Option<Map<K, T>> arrangeBy(Function<? super T, ? extends K> getKey) {
  return Option.of(groupBy(getKey).mapValues(Traversable<T>::singleOption))
      .filter(map -> !map.exists(kv -> kv._2.isEmpty()))
      .map(map -> Map.narrow(map.mapValues(Option::get)));
}

代码示例来源：origin: vavr-io/vavr

@Override
  public T getNext() {
    final T result = next.get();
    next = Option.none();
    return result;
  }
};

代码示例来源：origin: resilience4j/resilience4j

/**
 * Creates a RateLimiter.
 *
 * @param name              the name of the RateLimiter
 * @param rateLimiterConfig The RateLimiter configuration.
 * @param scheduler         executor that will refresh permissions
 */
public SemaphoreBasedRateLimiter(String name, RateLimiterConfig rateLimiterConfig,
                 ScheduledExecutorService scheduler) {
  this.name = requireNonNull(name, NAME_MUST_NOT_BE_NULL);
  this.rateLimiterConfig = new AtomicReference<>(requireNonNull(rateLimiterConfig, CONFIG_MUST_NOT_BE_NULL));
  this.scheduler = Option.of(scheduler).getOrElse(this::configureScheduler);
  this.semaphore = new Semaphore(this.rateLimiterConfig.get().getLimitForPeriod(), true);
  this.metrics = this.new SemaphoreBasedRateLimiterMetrics();
  this.eventProcessor = new RateLimiterEventProcessor();
  scheduleLimitRefresh();
}

代码示例来源：origin: jdbi/jdbi

@Test
public void testOptionMappedShouldSucceed() {
  final Set<Option<String>> result = dbRule.getSharedHandle()
      .createQuery("select name from something")
      .collectInto(new GenericType<Set<Option<String>>>() {});
  assertThat(result).hasSize(2);
  assertThat(result).contains(Option.none(), Option.of("eric"));
}

代码示例来源：origin: vavr-io/vavr

@Override
public boolean hasNext() {
  while (next.isEmpty() && that.hasNext()) {
    final T candidate = that.next();
    if (predicate.test(candidate)) {
      next = Option.some(candidate);
    }
  }
  return next.isDefined();
}

代码示例来源：origin: vavr-io/vavr

@SuppressWarnings("unchecked")
@Override
public <K2 extends K, V2 extends V> M merge(Multimap<K2, V2> that, BiFunction<Traversable<V>, Traversable<V2>, Traversable<V>> collisionResolution) {
  Objects.requireNonNull(that, "that is null");
  Objects.requireNonNull(collisionResolution, "collisionResolution is null");
  if (isEmpty()) {
    return (M) createFromEntries(that);
  } else if (that.isEmpty()) {
    return (M) this;
  } else {
    final Map<K, Traversable<V>> result = that.keySet().foldLeft(this.back, (map, key) -> {
      final Traversable<V> thisValues = map.get(key).getOrElse((Traversable<V>) emptyContainer.get());
      final Traversable<V2> thatValues = that.get(key).get();
      final Traversable<V> newValues = collisionResolution.apply(thisValues, thatValues);
      return map.put(key, newValues);
    });
    return (M) createFromMap(result);
  }
}

代码示例来源：origin: vavr-io/vavr

@Override
public T head() {
  if (isEmpty()) {
    throw new NoSuchElementException("head of empty TreeSet");
  } else {
    return tree.min().get();
  }
}

代码示例来源：origin: vavr-io/vavr

@Override
public boolean hasNext() {
  return nextVal.isDefined();
}