本文整理了Java中java.util.LinkedHashMap.computeIfAbsent()方法的一些代码示例，展示了LinkedHashMap.computeIfAbsent()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。LinkedHashMap.computeIfAbsent()方法的具体详情如下：
包路径：java.util.LinkedHashMap
类名称：LinkedHashMap
方法名：computeIfAbsent

LinkedHashMap.computeIfAbsent介绍

暂无

代码示例

代码示例来源：origin: SonarSource/sonarqube

private LinkedHashMap<String, Long> getOrCreateFacet(String facetName) {
  return facetsByName.computeIfAbsent(facetName, n -> new LinkedHashMap<>());
 }
}

代码示例来源：origin: spring-projects/spring-framework

@Override
@Nullable
public V computeIfAbsent(String key, Function<? super String, ? extends V> mappingFunction) {
  String oldKey = this.caseInsensitiveKeys.putIfAbsent(convertKey(key), key);
  if (oldKey != null) {
    return this.targetMap.get(oldKey);
  }
  return this.targetMap.computeIfAbsent(key, mappingFunction);
}

代码示例来源：origin: apache/kafka

private void update(Map<TopicPartition, S> partitionToState) {
  LinkedHashMap<String, List<TopicPartition>> topicToPartitions = new LinkedHashMap<>();
  for (TopicPartition tp : partitionToState.keySet()) {
    List<TopicPartition> partitions = topicToPartitions.computeIfAbsent(tp.topic(), k -> new ArrayList<>());
    partitions.add(tp);
  }
  for (Map.Entry<String, List<TopicPartition>> entry : topicToPartitions.entrySet()) {
    for (TopicPartition tp : entry.getValue()) {
      S state = partitionToState.get(tp);
      map.put(tp, state);
    }
  }
}

代码示例来源：origin: org.springframework/spring-core

@Override
@Nullable
public V computeIfAbsent(String key, Function<? super String, ? extends V> mappingFunction) {
  String oldKey = this.caseInsensitiveKeys.putIfAbsent(convertKey(key), key);
  if (oldKey != null) {
    return this.targetMap.get(oldKey);
  }
  return this.targetMap.computeIfAbsent(key, mappingFunction);
}

代码示例来源：origin: speedment/speedment

/**
 * This method will return the value for the specified key if it is cached,
 * and if not, will calculate the value using the supplied method. The
 * computed value may or may not be stored in the cache afterwards. This
 * method is guaranteed to be lock-free, and might calculate the value
 * instead of using the cached one to avoid blocking.
 *
 * @param key      the key to retrieve the value for
 * @param compute  method to use to compute the value if it is not cached
 * @return         the cached or computed value
 */
public long getOrCompute(K key, LongSupplier compute) {
  if (free.compareAndSet(true, false)) {
    try {
      return cache.computeIfAbsent(key, k -> compute.getAsLong());
    } finally {
      free.set(true);
    }
  } else {
    return compute.getAsLong();
  }
}

代码示例来源：origin: org.apache.lucene/lucene-analyzers-common

private void handleWrappedFilterArgs(Map<String, String> args) {
 LinkedHashMap<String, Map<String, String>> wrappedFilterArgs = new LinkedHashMap<>();
 splitAt(',', wrappedFilters).forEach(filterName -> {          // Format: SPIname[-id]
  filterName = filterName.trim().toLowerCase(Locale.ROOT);             // Treat case-insensitively
  if (wrappedFilterArgs.containsKey(filterName)) {
   throw new IllegalArgumentException("wrappedFilters contains duplicate '"
     + filterName + "'. Add unique '-id' suffixes (stripped prior to SPI lookup).");
  }
  wrappedFilterArgs.put(filterName, new HashMap<>());
 });
 for (Iterator<Map.Entry<String, String>> iterator = args.entrySet().iterator(); iterator.hasNext(); ) {
  Map.Entry<String, String> entry = iterator.next();
  String filterArgKey = entry.getKey();
  String argValue = entry.getValue();
  List<String> splitKey = splitAt(FILTER_ARG_SEPARATOR, filterArgKey); // Format: filterName.argKey
  if (splitKey.size() == 2) {                                          // Skip if no slash
   String filterName = splitKey.get(0).toLowerCase(Locale.ROOT);
   if (wrappedFilterArgs.containsKey(filterName)) {                   // Skip if not in "wrappedFilter" arg
    Map<String, String> filterArgs = wrappedFilterArgs.computeIfAbsent(filterName, k -> new HashMap<>());
    String argKey = splitKey.get(1);
    filterArgs.put(argKey, argValue); // argKey is guaranteed unique, don't need to check for duplicates
    iterator.remove();
   }
  }
 }
 if (args.isEmpty()) {
  populateInnerFilters(wrappedFilterArgs);
 }
}

代码示例来源：origin: ebean-orm/ebean

/**
 * Add a 'pending drops' changeSet for the given version.
 */
public void add(MigrationVersion version, ChangeSet changeSet) {
 Entry entry = map.computeIfAbsent(version.normalised(), k -> new Entry(version));
 entry.add(changeSet);
}

代码示例来源：origin: com.blackducksoftware.magpie/magpie

@Override
  public String[] computeIfAbsent(String key, Function<? super String, ? extends String[]> mappingFunction) {
    synchronized (this) {
      return super.computeIfAbsent(key, mappingFunction);
    }
  }
};

代码示例来源：origin: org.seedstack.shed/shed

@Override
public V get(K key) {
  synchronized (map) {
    return map.computeIfAbsent(key, loadingFunction);
  }
}

代码示例来源：origin: com.ca.apim.gateway/gateway-export-plugin

@Override
public synchronized Object computeIfAbsent(Object key, Function<? super Object, ?> mappingFunction) {
  return propertyMap.computeIfAbsent(key, mappingFunction);
}

代码示例来源：origin: org.sonarsource.sonarqube/sonar-server

private LinkedHashMap<String, Long> getOrCreateFacet(String facetName) {
  return facetsByName.computeIfAbsent(facetName, n -> new LinkedHashMap<>());
 }
}

代码示例来源：origin: SonarSonic/Calculator

public static ArrayList<IResearch> getPlayerResearch(UUID uuid) {
    if (uuid != null) {
      research.computeIfAbsent(uuid, k -> new ArrayList<>());
      return research.get(uuid);
    }
    return new ArrayList<>();
  }
}

代码示例来源：origin: com.qwazr/qwazr-extractor

/**
 * Add a field/value pair to the document
 *
 * @param field the name of the field
 * @param value any value
 */
public void add(final ParserField field, final Object value) {
  if (value == null)
    return;
  if (fields == null)
    fields = new LinkedHashMap<>();
  final List<Object> values = (List<Object>) fields.computeIfAbsent(field.name, f -> new ArrayList<>(1));
  if (value instanceof Collection)
    values.addAll((Collection) value);
  else
    values.add(value);
}

代码示例来源：origin: org.opencb.biodata/biodata-models

public VariantBuilder addSample(String sampleName, List<String> data) {
  checkStudy("add sample");
  if (samplesData == null) {
    samplesData = new ArrayList<>(samplesPosition != null ? samplesPosition.size() : 1);
  }
  if (samplesPosition == null) {
    samplesPosition = new LinkedHashMap<>();
  }
  Integer idx = samplesPosition.computeIfAbsent(sampleName, k -> samplesPosition.size());
  addSample(idx, data);
  return this;
}

代码示例来源：origin: org.apache.servicemix.bundles/org.apache.servicemix.bundles.spring-core

@Override
@Nullable
public V computeIfAbsent(String key, Function<? super String, ? extends V> mappingFunction) {
  String oldKey = this.caseInsensitiveKeys.putIfAbsent(convertKey(key), key);
  if (oldKey != null) {
    return this.targetMap.get(oldKey);
  }
  return this.targetMap.computeIfAbsent(key, mappingFunction);
}

代码示例来源：origin: com.steammachine.org/common.utils

public void setProperty(String key, String value) {
  Key keyy = new Key(ItemType.VALUE, key);
  properties.computeIfAbsent(keyy, key1 -> Item.value("%s=%s", key1.id, null)).value = value;
}

代码示例来源：origin: cool.pandora/modeller-core

/**
 * @param bagger Bagger
 */
private void initializeProfile(final Bagger bagger) {
  final Collection<Profile> profiles = bagger.loadProfiles();
  userProfiles = new HashMap<>();
  profileFieldsMap = new LinkedHashMap<>();
  for (final Profile profile : profiles) {
    userProfiles.put(profile.getName(), profile);
    final LinkedHashMap<String, ProfileField> standardFields = profile.getStandardFields();
    final LinkedHashMap<String, ProfileField> customFields = profile.getCustomFields();
    final LinkedHashMap<String, ProfileField> mergedMap = new LinkedHashMap<>();
    mergedMap.putAll(standardFields);
    mergedMap.putAll(customFields);
    for (final ProfileField profileField : mergedMap.values()) {
      final List<ProfileField> list =
          profileFieldsMap.computeIfAbsent(profile.getName(), k -> new ArrayList<>());
      list.add(profileField);
    }
  }
}

代码示例来源：origin: io.ebean/ebean

/**
 * Add a 'pending drops' changeSet for the given version.
 */
public void add(MigrationVersion version, ChangeSet changeSet) {
 Entry entry = map.computeIfAbsent(version.normalised(), k -> new Entry(version));
 entry.add(changeSet);
}

代码示例来源：origin: making/spring-boot-db-samples

private static Collector<PizzaView, ?, List<Pizza>> toPizzaList() {
  BiConsumer<LinkedHashMap<Long, Pizza>, PizzaView> accumulator = (acc, pv) -> {
    Topping t = new Topping(pv.toppingId);
    t.setName(pv.toppingName);
    Pizza p = acc.computeIfAbsent(pv.id, pv::toPizza);
    p.getToppings().add(t);
    acc.put(pv.id, p);
  };
  return Collector.of(LinkedHashMap::new, accumulator, (l, r) -> {
    r.forEach((key, value) -> l.merge(key, value, (p1, p2) -> {
      p1.getToppings().addAll(p2.getToppings());
      return p1;
    }));
    return l;
  }, map -> new ArrayList<>(map.values()));
}

代码示例来源：origin: vavr-io/vavr-jackson

private static String expectedMultimapJson(Multimap<?, ?> multimap, int opts) {
  final LinkedHashMap<Object, List<Object>> map = new LinkedHashMap<>();
  multimap.forEach(e -> {
    List<Object> list = map.computeIfAbsent(e._1, k -> new ArrayList<>());
    list.add(e._2);
  });
  StringBuilder sb = new StringBuilder("{");
  map.forEach((k, l) -> sb.append(expectedJson(k.toString(), opts)).append(":").append(expectedJson(io.vavr.collection.Stream.ofAll(l))));
  sb.append("}");
  return sb.toString();
}