io.vavr.collection.Map.get()方法的使用及代码示例

x33g5p2x  于2022-01-25 转载在 其他  
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本文整理了Java中io.vavr.collection.Map.get()方法的一些代码示例，展示了Map.get()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。Map.get()方法的具体详情如下：
包路径：io.vavr.collection.Map
类名称：Map
方法名：get

Map.get介绍

[英]Returns the Some of value to which the specified key is mapped, or None if this map contains no mapping for the key.
[中]返回指定键映射到的某个值，如果此映射不包含该键的映射，则返回None。

代码示例

代码示例来源：origin: vavr-io/vavr

@Override
public Option<Traversable<V>> get(K key) {
  return back.get(key);
}

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

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

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: vavr-io/vavr

/**
 * Turns this map from a partial function into a total function that
 * returns a value computed by defaultFunction for all keys
 * absent from the map.
 *
 * @param defaultFunction function to evaluate 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> withDefault(Function<? super K, ? extends V> defaultFunction) {
  return k -> get(k).getOrElse(() -> defaultFunction.apply(k));
}

代码示例来源：origin: jdbi/jdbi

private Option<Collector<?, ?, ?>> resolveDefaultCollector(Class<?> erasedType) {
  return defaultImplementations.get(erasedType).flatMap(collectors::get);
}

代码示例来源：origin: vavr-io/vavr

@Override
default boolean contains(Tuple2<K, V> element) {
  return get(element._1).map(v -> Objects.equals(v, element._2)).getOrElse(false);
}

代码示例来源：origin: vavr-io/vavr

@SuppressWarnings("unchecked")
static <K, V, K2, U extends Map<K2, V>> U mapKeys(Map<K, V> source, U zero, Function<? super K, ? extends K2> keyMapper, BiFunction<? super V, ? super V, ? extends V> valueMerge) {
  Objects.requireNonNull(zero, "zero is null");
  Objects.requireNonNull(keyMapper, "keyMapper is null");
  Objects.requireNonNull(valueMerge, "valueMerge is null");
  return source.foldLeft(zero, (acc, entry) -> {
    final K2 k2 = keyMapper.apply(entry._1);
    final V v2 = entry._2;
    final Option<V> v1 = acc.get(k2);
    final V v = v1.isDefined() ? valueMerge.apply(v1.get(), v2) : v2;
    return (U) acc.put(k2, v);
  });
}

代码示例来源：origin: vavr-io/vavr

@SuppressWarnings("unchecked")
static <K, V, U extends V, M extends Map<K, V>> M put(M map, K key, U value,
    BiFunction<? super V, ? super U, ? extends V> merge) {
  Objects.requireNonNull(merge, "the merge function is null");
  final Option<V> currentValue = map.get(key);
  if (currentValue.isEmpty()) {
    return (M) map.put(key, value);
  } else {
    return (M) map.put(key, merge.apply(currentValue.get(), value));
  }
}

代码示例来源：origin: vavr-io/vavr

@SuppressWarnings("unchecked")
static <K, V, M extends Map<K, V>> Tuple2<V, M> computeIfAbsent(M map, K key, Function<? super K, ? extends V> mappingFunction) {
  Objects.requireNonNull(mappingFunction, "mappingFunction is null");
  final Option<V> value = map.get(key);
  if (value.isDefined()) {
    return Tuple.of(value.get(), map);
  } else {
    final V newValue = mappingFunction.apply(key);
    final M newMap = (M) map.put(key, newValue);
    return Tuple.of(newValue, newMap);
  }
}

代码示例来源：origin: vavr-io/vavr

static <K, V, U extends V, M extends Map<K, V>> M put(M map, Tuple2<? extends K, U> entry,
    BiFunction<? super V, ? super U, ? extends V> merge) {
  Objects.requireNonNull(merge, "the merge function is null");
  final Option<V> currentValue = map.get(entry._1);
  if (currentValue.isEmpty()) {
    return put(map, entry);
  } else {
    return put(map, entry.map2(value -> merge.apply(currentValue.get(), value)));
  }
}

代码示例来源：origin: vavr-io/vavr

@SuppressWarnings("unchecked")
static <K, V, U extends V, M extends Map<K, V>> M merge(
    M map, OfEntries<K, V, M> ofEntries,
    Map<? extends K, U> that, BiFunction<? super V, ? super U, ? extends V> collisionResolution) {
  Objects.requireNonNull(that, "that is null");
  Objects.requireNonNull(collisionResolution, "collisionResolution is null");
  if (map.isEmpty()) {
    return ofEntries.apply(Map.narrow(that));
  } else if (that.isEmpty()) {
    return map;
  } else {
    return that.foldLeft(map, (result, entry) -> {
      final K key = entry._1;
      final U value = entry._2;
      final V newValue = result.get(key).map(v -> (V) collisionResolution.apply(v, value)).getOrElse(value);
      return (M) result.put(key, newValue);
    });
  }
}

代码示例来源：origin: vavr-io/vavr

@SuppressWarnings("unchecked")
@Override
public M put(K key, V value) {
  final Traversable<V> values = back.get(key).getOrElse((Traversable<V>) emptyContainer.get());
  final Traversable<V> newValues = containerType.add(values, value);
  return (M) (newValues == values ? this : createFromMap(back.put(key, newValues)));
}

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: apache/incubator-pinot

@Override
public Map<String, ?> apply(Map<String, ?> childKeys, String pathPrefix) {
 // Adjust the name to add the table suffix to table.name.realtime/table.name.offline
 List<String> tableTypes = childKeys.get("table.types").map(tableTypesListOrString -> {
  if (tableTypesListOrString instanceof String) {
   return List.of((String) tableTypesListOrString);
  } else if (tableTypesListOrString instanceof Collection) {
   return List.ofAll((Collection<String>) tableTypesListOrString);
  } else {
   return List.empty();
  }
 }).getOrElse(List.empty()).map(Object::toString);
 String tableName = childKeys.get("table.name").map(Object::toString).getOrElse(
   () -> childKeys.get("table.name.realtime").map(Object::toString)
     .getOrElse(() -> childKeys.get("table.name.offline").map(Object::toString).getOrNull()));
 Map<String, Object> remappedConfig = (Map<String, Object>) childKeys;
 for (String tableType : tableTypes) {
  String tableNameKey = "table.name." + tableType.toLowerCase();
  CommonConstants.Helix.TableType type = CommonConstants.Helix.TableType.valueOf(tableType.toUpperCase());
  remappedConfig = remappedConfig.put(tableNameKey, TableNameBuilder.forType(type).tableNameWithType(tableName));
 }
 remappedConfig = remappedConfig.remove("table.name");
 return remappedConfig;
}

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: apache/incubator-pinot

@Override
public Map<String, ?> apply(Map<String, ?> config, String keyPrefix) {
 // Generate keys for table types based on table.types
 // eg. table.types=[offline,realtime] -> table.type.realtime=realtime, table.type.offline=offline
 config = ((Map<String, Object>) config).merge(config.get("table.types").map(typeList -> {
  if (typeList instanceof String) {
   return List.of((String) typeList);
  } else if (typeList instanceof Collection) {
   return List.ofAll((Collection<String>) typeList);
  } else {
   return List.empty();
  }
 }).map(typeList -> typeList.map(type -> Tuple.of("table.type." + type.toString().toLowerCase(), type))
   .toMap(Function.identity())).getOrElse(HashMap::empty));
 config = config.remove("table.types");
 return config;
}

代码示例来源：origin: vavr-io/vavr

@SuppressWarnings("unchecked")
@Override
public M remove(K key, V value) {
  final Traversable<V> values = back.get(key).getOrElse((Traversable<V>) emptyContainer.get());
  final Traversable<V> newValues = containerType.remove(values, value);
  if (newValues == values) {
    return (M) this;
  } else if (newValues.isEmpty()) {
    return (M) createFromMap(back.remove(key));
  } else {
    return (M) createFromMap(back.put(key, newValues));
  }
}

代码示例来源：origin: vavr-io/vavr

@SuppressWarnings("unchecked")
private <K2, V2> Multimap<K2, V2> createFromEntries(Iterable<? extends Tuple2<? extends K2, ? extends V2>> entries) {
  Map<K2, Traversable<V2>> back = emptyMapSupplier();
  for (Tuple2<? extends K2, ? extends V2> entry : entries) {
    if (back.containsKey(entry._1)) {
      back = back.put(entry._1, containerType.add(back.get(entry._1).get(), entry._2));
    } else {
      back = back.put(entry._1, containerType.add(emptyContainer.get(), entry._2));
    }
  }
  return createFromMap(back);
}

代码示例来源：origin: Swagger2Markup/swagger2markup

@Override
public MarkupDocBuilder apply(MarkupDocBuilder markupDocBuilder, Parameters params) {
  DataFrame dataFrame = params.dataFrame;
  java.util.List<MarkupTableColumn> columnSpecs = dataFrame.getColumns().map(column -> {
        Integer widthRatio = Integer.valueOf(column.getMetaData().get(WIDTH_RATIO).getOrElse("0"));
        return new MarkupTableColumn(column.getId().getName())
            .withWidthRatio(widthRatio)
            .withHeaderColumn(Boolean.parseBoolean(column.getMetaData().get(HEADER_COLUMN).getOrElse("false")))
            .withMarkupSpecifiers(MarkupLanguage.ASCIIDOC, ".^" + widthRatio + "a");
      }
  ).toJavaList();
  IndexedSeq<IndexedSeq<String>> columnValues = dataFrame.getColumns()
      .map(column -> ((StringColumn) column).getValues());
  java.util.List<java.util.List<String>> cells = Array.range(0, dataFrame.getRowCount())
      .map(rowNumber -> columnValues.map(values -> values.get(rowNumber)).toJavaList()).toJavaList();
  return markupDocBuilder.tableWithColumnSpecs(columnSpecs, cells);
}

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