io.vavr.collection.HashMap类的使用及代码示例

x33g5p2x  于2022-01-20 转载在 其他  
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本文整理了Java中io.vavr.collection.HashMap类的一些代码示例，展示了HashMap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。HashMap类的具体详情如下：
包路径：io.vavr.collection.HashMap
类名称：HashMap

HashMap介绍

[英]An immutable HashMap implementation based on a Hash array mapped trie (HAMT).
[中]基于Hash array mapped trie (HAMT)的不可变HashMap实现。

代码示例

代码示例来源：origin: vavr-io/vavr

/**
 * Alias for {@link HashMap#of(Object, Object)}
 *
 * @param <K> The key type.
 * @param <V> The value type.
 * @param k1  The key
 * @param v1  The value
 * @return A new {@link HashMap} instance containing the given entries
 */
public static <K, V> Map<K, V> Map(K k1, V v1) {
  return HashMap.of(k1, v1);
}

代码示例来源：origin: vavr-io/vavr

/**
 * Alias for {@link HashMap#empty()}
 *
 * @param <K> The key type.
 * @param <V> The value type.
 * @return A singleton instance of empty {@link HashMap}
 */
public static <K, V> Map<K, V> Map() {
  return HashMap.empty();
}

代码示例来源：origin: vavr-io/vavr

@Override
public java.util.HashMap<K, V> toJavaMap() {
  return toJavaMap(java.util.HashMap::new, t -> t);
}

代码示例来源：origin: vavr-io/vavr

@Override
public HashMap<K, V> orElse(Iterable<? extends Tuple2<K, V>> other) {
  return isEmpty() ? ofEntries(other) : this;
}

代码示例来源：origin: vavr-io/vavr

/**
 * Creates a HashMap of the given list of key-value pairs.
 *
 * @param k1  a key for the map
 * @param v1  the value for k1
 * @param k2  a key for the map
 * @param v2  the value for k2
 * @param <K> The key type
 * @param <V> The value type
 * @return A new Map containing the given entries
 */
public static <K, V> HashMap<K, V> of(K k1, V v1, K k2, V v2) {
  return of(k1, v1).put(k2, v2);
}

代码示例来源：origin: vavr-io/vavr

@Override
public <K2, V2> HashMap<K2, V2> flatMap(BiFunction<? super K, ? super V, ? extends Iterable<Tuple2<K2, V2>>> mapper) {
  Objects.requireNonNull(mapper, "mapper is null");
  return foldLeft(HashMap.<K2, V2> empty(), (acc, entry) -> {
    for (Tuple2<? extends K2, ? extends V2> mappedEntry : mapper.apply(entry._1, entry._2)) {
      acc = acc.put(mappedEntry);
    }
    return acc;
  });
}

代码示例来源：origin: daggerok/spring-5-examples

.uri(
  "/search/users?q={q}&page={page}&per_page={per_page}",
  HashMap.of(
    "q", request.pathVariable("username"),
    "page", request.queryParam("page").orElse("0"),
    "per_page", request.queryParam("size").orElse("3")
  ).toJavaMap()

代码示例来源：origin: apache/incubator-pinot

@Override
 public io.vavr.collection.Map<String, ?> unhandleChildKeys(Map<String, Map<String, String>> value,
   String pathPrefix) {
  HashMap<String, String> retVal = HashMap.ofAll(value).flatMap((taskKey, configs) -> {
   if (!configs.isEmpty()) {
    return HashMap.ofAll(configs).map((configKey, configValue) -> Tuple.of(taskKey + "." + configKey, configValue));
   } else {
    return HashMap.of(taskKey, "");
   }
  });

  return retVal;
 }
}

代码示例来源：origin: vavr-io/vavr

/**
 * Creates a LinkedHashMap of the given entries.
 *
 * @param entries Map entries
 * @param <K>     The key type
 * @param <V>     The value type
 * @return A new Map containing the given entries
 */
@SuppressWarnings("unchecked")
public static <K, V> LinkedHashMap<K, V> ofEntries(Iterable<? extends Tuple2<? extends K, ? extends V>> entries) {
  Objects.requireNonNull(entries, "entries is null");
  if (entries instanceof LinkedHashMap) {
    return (LinkedHashMap<K, V>) entries;
  } else {
    HashMap<K, V> map = HashMap.empty();
    Queue<Tuple2<K, V>> list = Queue.empty();
    for (Tuple2<? extends K, ? extends V> entry : entries) {
      map = map.put(entry);
      list = list.append((Tuple2<K, V>) entry);
    }
    return wrapNonUnique(list, map);
  }
}

代码示例来源：origin: vavr-io/vavr-jackson

@Test
public void testHashMap() throws Exception {
  HashMap<String, A> src = HashMap.of("a", new B("a", "b"));
  String json = MAPPER.writeValueAsString(new HashMapPojo().setValue(src));
  Assert.assertEquals(json, "{\"value\":{\"a\":{\"ExtFieldsPojoTest$B\":{\"a\":\"a\",\"b\":\"b\"}}}}");
  HashMapPojo pojo = MAPPER.readValue(json, HashMapPojo.class);
  HashMap<String, A> restored = pojo.getValue();
  Assert.assertTrue(restored.get("a").get() instanceof B);
  Assert.assertEquals(restored.get("a").get().a, "a");
  Assert.assertEquals(((B) restored.get("a").get()).b, "b");
}

代码示例来源：origin: vavr-io/vavr

private HashMap<K, V> createFromEntries(Iterable<Tuple2<K, V>> tuples) {
    return HashMap.ofEntries(tuples);
  }
}

代码示例来源：origin: org.janusgraph/janusgraph-cql

Session initializeSession(final String keyspaceName) {
  final Session s = this.cluster.connect();
  // if the keyspace already exists, just return the session
  if (this.cluster.getMetadata().getKeyspace(keyspaceName) != null) {
    return s;
  }
  final Configuration configuration = getStorageConfig();
  // Setting replication strategy based on value reading from the configuration: either "SimpleStrategy" or "NetworkTopologyStrategy"
  final Map<String, Object> replication = Match(configuration.get(REPLICATION_STRATEGY)).of(
    Case($("SimpleStrategy"), strategy -> HashMap.<String, Object> of("class", strategy, "replication_factor", configuration.get(REPLICATION_FACTOR))),
    Case($("NetworkTopologyStrategy"),
      strategy -> HashMap.<String, Object> of("class", strategy)
        .merge(Array.of(configuration.get(REPLICATION_OPTIONS))
          .grouped(2)
          .toMap(array -> Tuple.of(array.get(0), Integer.parseInt(array.get(1)))))))
    .toJavaMap();
  s.execute(createKeyspace(keyspaceName)
      .ifNotExists()
      .with()
      .replication(replication));
  return s;
}

代码示例来源：origin: daggerok/spring-5-examples

@Bean
 InitializingBean initDB() {
  return () -> HashMap.of(123, "ololo",
              456, "trololo")
            .map((orderNumber, description) -> Tuple.of(BigDecimal.valueOf(orderNumber * System.currentTimeMillis() / 1234567890.987654321),
                                  singletonList(description)))
            .map(t -> Order.of(OrderNumber.of(t._1().intValue()), Price.of(t._1())))
            .forEach(orderRepository::save);
 }
}

代码示例来源：origin: vavr-io/vavr

/**
 * Creates a HashMap of the given entries.
 *
 * @param entries Map entries
 * @param <K>     The key type
 * @param <V>     The value type
 * @return A new Map containing the given entries
 */
@SuppressWarnings("unchecked")
public static <K, V> HashMap<K, V> ofEntries(Iterable<? extends Tuple2<? extends K, ? extends V>> entries) {
  Objects.requireNonNull(entries, "entries is null");
  if (entries instanceof HashMap) {
    return (HashMap<K, V>) entries;
  } else {
    HashArrayMappedTrie<K, V> trie = HashArrayMappedTrie.empty();
    for (Tuple2<? extends K, ? extends V> entry : entries) {
      trie = trie.put(entry._1, entry._2);
    }
    return trie.isEmpty() ? empty() : wrap(trie);
  }
}

代码示例来源：origin: vavr-io/vavr

private static <K, V> HashMap<K, V> wrap(HashArrayMappedTrie<K, V> trie) {
  return trie.isEmpty() ? empty() : new HashMap<>(trie);
}

代码示例来源：origin: vavr-io/vavr-jackson

@Test
public void testHashMapClass() throws Exception {
  HashMapClass src = new HashMapClass(HashMap.of(42, new ImplementedClass()));
  String json = MAPPER.writeValueAsString(src);
  HashMapClass restored = MAPPER.readValue(json, HashMapClass.class);
  Assert.assertEquals(restored.value.head()._2.getClass(), ImplementedClass.class);
}

代码示例来源：origin: vavr-io/vavr

@Override
public LinkedHashMap<K, V> replace(Tuple2<K, V> currentElement, Tuple2<K, V> newElement) {
  Objects.requireNonNull(currentElement, "currentElement is null");
  Objects.requireNonNull(newElement, "newElement is null");
  // We replace the whole element, i.e. key and value have to be present.
  if (!Objects.equals(currentElement, newElement) && contains(currentElement)) {
    Queue<Tuple2<K, V>> newList = list;
    HashMap<K, V> newMap = map;
    final K currentKey = currentElement._1;
    final K newKey = newElement._1;
    // If current key and new key are equal, the element will be automatically replaced,
    // otherwise we need to remove the pair (newKey, ?) from the list manually.
    if (!Objects.equals(currentKey, newKey)) {
      final Option<V> value = newMap.get(newKey);
      if (value.isDefined()) {
        newList = newList.remove(Tuple.of(newKey, value.get()));
      }
    }
    newList = newList.replace(currentElement, newElement);
    newMap = newMap.remove(currentKey).put(newElement);
    return wrap(newList, newMap);
  } else {
    return this;
  }
}

代码示例来源：origin: vavr-io/vavr

@Override
public <V2> HashMap<K, V2> mapValues(Function<? super V, ? extends V2> valueMapper) {
  Objects.requireNonNull(valueMapper, "valueMapper is null");
  return map((k, v) -> Tuple.of(k, valueMapper.apply(v)));
}

代码示例来源：origin: vavr-io/vavr

@Override
public <K2, V2> HashMap<K2, V2> bimap(Function<? super K, ? extends K2> keyMapper, Function<? super V, ? extends V2> valueMapper) {
  Objects.requireNonNull(keyMapper, "keyMapper is null");
  Objects.requireNonNull(valueMapper, "valueMapper is null");
  final Iterator<Tuple2<K2, V2>> entries = iterator().map(entry -> Tuple.of(keyMapper.apply(entry._1), valueMapper.apply(entry._2)));
  return HashMap.ofEntries(entries);
}

代码示例来源：origin: vavr-io/vavr

@Override
public HashMap<K, V> tail() {
  if (trie.isEmpty()) {
    throw new UnsupportedOperationException("tail of empty HashMap");
  } else {
    return remove(head()._1);
  }
}

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