java.util.Objects.isNull()方法的使用及代码示例

x33g5p2x  于2022-01-17 转载在 其他  
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本文整理了Java中java.util.Objects.isNull()方法的一些代码示例，展示了Objects.isNull()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。Objects.isNull()方法的具体详情如下：
包路径：java.util.Objects
类名称：Objects
方法名：isNull

Objects.isNull介绍

[英]Returns true if the provided reference is null otherwise returns false.
[中]如果提供的引用为null，则返回true，否则返回false。

代码示例

代码示例来源：origin: apache/storm

/**
 * nullToZero.
 * @param value value
 * @return nullToZero
 */
private static Double nullToZero(Double value) {
  return !Objects.isNull(value) ? value : 0;
}

代码示例来源：origin: apache/storm

/**
 * nullToZero.
 * @param value value
 * @return nullToZero
 */
private static Long nullToZero(Long value) {
  return !Objects.isNull(value) ? value : 0;
}

代码示例来源：origin: ctripcorp/apollo

public boolean isClusterNameUnique(String appId, String clusterName) {
 Objects.requireNonNull(appId, "AppId must not be null");
 Objects.requireNonNull(clusterName, "ClusterName must not be null");
 return Objects.isNull(clusterRepository.findByAppIdAndName(appId, clusterName));
}

代码示例来源：origin: ctripcorp/apollo

public boolean isNamespaceUnique(String appId, String cluster, String namespace) {
 Objects.requireNonNull(appId, "AppId must not be null");
 Objects.requireNonNull(cluster, "Cluster must not be null");
 Objects.requireNonNull(namespace, "Namespace must not be null");
 return Objects.isNull(
   namespaceRepository.findByAppIdAndClusterNameAndNamespaceName(appId, cluster, namespace));
}

代码示例来源：origin: ctripcorp/apollo

public boolean isAppNamespaceNameUnique(String appId, String namespaceName) {
 Objects.requireNonNull(appId, "AppId must not be null");
 Objects.requireNonNull(namespaceName, "Namespace must not be null");
 return Objects.isNull(appNamespaceRepository.findByAppIdAndName(appId, namespaceName));
}

代码示例来源：origin: ctripcorp/apollo

public boolean isAppNamespaceNameUnique(String appId, String namespaceName) {
 Objects.requireNonNull(appId, "AppId must not be null");
 Objects.requireNonNull(namespaceName, "Namespace must not be null");
 return Objects.isNull(appNamespaceRepository.findByAppIdAndName(appId, namespaceName));
}

代码示例来源：origin: ctripcorp/apollo

public boolean isAppIdUnique(String appId) {
 Objects.requireNonNull(appId, "AppId must not be null");
 return Objects.isNull(appRepository.findByAppId(appId));
}

代码示例来源：origin: hibernate/hibernate-orm

@SuppressWarnings("unchecked")
  public static <T> ValueGenerator<T> get(final Class<T> type) {
    final ValueGenerator<?> valueGeneratorSupplier = generators.get(
        type );
    if ( Objects.isNull( valueGeneratorSupplier ) ) {
      throw new HibernateException(
          "Unsupported property type [" + type.getName() + "] for @CreationTimestamp or @UpdateTimestamp generator annotation" );
    }

    return (ValueGenerator<T>) valueGeneratorSupplier;
  }
}

代码示例来源：origin: ctripcorp/apollo

@Override
public Release loadConfig(String clientAppId, String clientIp, String configAppId, String configClusterName,
  String configNamespace, String dataCenter, ApolloNotificationMessages clientMessages) {
 // load from specified cluster fist
 if (!Objects.equals(ConfigConsts.CLUSTER_NAME_DEFAULT, configClusterName)) {
  Release clusterRelease = findRelease(clientAppId, clientIp, configAppId, configClusterName, configNamespace,
    clientMessages);
  if (!Objects.isNull(clusterRelease)) {
   return clusterRelease;
  }
 }
 // try to load via data center
 if (!Strings.isNullOrEmpty(dataCenter) && !Objects.equals(dataCenter, configClusterName)) {
  Release dataCenterRelease = findRelease(clientAppId, clientIp, configAppId, dataCenter, configNamespace,
    clientMessages);
  if (!Objects.isNull(dataCenterRelease)) {
   return dataCenterRelease;
  }
 }
 // fallback to default release
 return findRelease(clientAppId, clientIp, configAppId, ConfigConsts.CLUSTER_NAME_DEFAULT, configNamespace,
   clientMessages);
}

代码示例来源：origin: yu199195/hmily

@Override
public Boolean updateRetry(final String id, final Integer retry, final String appName) {
  if (StringUtils.isBlank(id) || StringUtils.isBlank(appName) || Objects.isNull(retry)) {
    return false;
  }
  final String tableName = RepositoryPathUtils.buildDbTableName(appName);
  String sqlBuilder =
      String.format("update %s  set retried_count = %d,last_time= '%s' where trans_id =%s",
          tableName, retry, DateUtils.getCurrentDateTime(), id);
  jdbcTemplate.execute(sqlBuilder);
  return Boolean.TRUE;
}

代码示例来源：origin: codingapi/tx-lcn

@Override
public void removeAttachments(String groupId, String unitId) {
  GroupCache groupCache = transactionInfoMap.get(groupId);
  if (Objects.isNull(groupCache)) {
    return;
  }
  groupCache.getUnits().remove(unitId);
  if (groupCache.getUnits().size() == 0) {
    transactionInfoMap.remove(groupId);
  }
}

代码示例来源：origin: skylot/jadx

private void test() {
  TestCls thisVar = this;
  if (Objects.isNull(thisVar)) {
    System.out.println("null");
  }
  thisVar.method();
  thisVar.field = 123;
}

代码示例来源：origin: Graylog2/graylog2-server

@Override
  public Optional<Entity> exportEntity(EntityDescriptor entityDescriptor, EntityDescriptorIds entityDescriptorIds) {
    final ModelId modelId = entityDescriptor.id();
    final Collector collector = collectorService.find(modelId.id());
    if (isNull(collector)) {
      LOG.debug("Couldn't find collector {}", entityDescriptor);
      return Optional.empty();
    }

    return Optional.of(exportNativeEntity(collector, entityDescriptorIds));
  }
}

代码示例来源：origin: Graylog2/graylog2-server

@Override
public Optional<Entity> exportEntity(EntityDescriptor entityDescriptor, EntityDescriptorIds entityDescriptorIds) {
  final ModelId modelId = entityDescriptor.id();
  final Configuration configuration = configurationService.find(modelId.id());
  if (isNull(configuration)) {
    LOG.debug("Couldn't find collector configuration {}", entityDescriptor);
    return Optional.empty();
  }
  return Optional.of(exportNativeEntity(configuration, entityDescriptorIds));
}

代码示例来源：origin: codingapi/tx-lcn

@Override
public void deleteByFields(List<Field> fields) throws TxLoggerException {
  if (Objects.isNull(dbHelper)) {
    throw new TxLoggerException("系统日志被禁用");
  }
  StringBuilder sql = new StringBuilder("delete from t_logger where 1=1 and ");
  List<String> values = whereSqlAppender(sql, fields);
  dbHelper.update(sql.toString(), values.toArray(new Object[0]));
}

代码示例来源：origin: ctripcorp/apollo

/**
 * @param clientAppId the application which uses public config
 * @param namespace   the namespace
 * @param dataCenter  the datacenter
 */
private Release findPublicConfig(String clientAppId, String clientIp, String clusterName,
                 String namespace, String dataCenter, ApolloNotificationMessages clientMessages) {
 AppNamespace appNamespace = appNamespaceService.findPublicNamespaceByName(namespace);
 //check whether the namespace's appId equals to current one
 if (Objects.isNull(appNamespace) || Objects.equals(clientAppId, appNamespace.getAppId())) {
  return null;
 }
 String publicConfigAppId = appNamespace.getAppId();
 return configService.loadConfig(clientAppId, clientIp, publicConfigAppId, clusterName, namespace, dataCenter,
   clientMessages);
}

代码示例来源：origin: ctripcorp/apollo

@Transactional
@PreAuthorize(value = "@permissionValidator.isSuperAdmin()")
@PostMapping(value = "/consumers")
public ConsumerToken createConsumer(@RequestBody Consumer consumer,
                  @RequestParam(value = "expires", required = false)
                  @DateTimeFormat(pattern = "yyyyMMddHHmmss") Date
                    expires) {
 if (StringUtils.isContainEmpty(consumer.getAppId(), consumer.getName(),
                 consumer.getOwnerName(), consumer.getOrgId())) {
  throw new BadRequestException("Params(appId、name、ownerName、orgId) can not be empty.");
 }
 Consumer createdConsumer = consumerService.createConsumer(consumer);
 if (Objects.isNull(expires)) {
  expires = DEFAULT_EXPIRES;
 }
 return consumerService.generateAndSaveConsumerToken(createdConsumer, expires);
}

代码示例来源：origin: ctripcorp/apollo

@PreAuthorize(value = "@permissionValidator.isSuperAdmin()")
@PostMapping("/server/config")
public ServerConfig createOrUpdate(@Valid @RequestBody ServerConfig serverConfig) {
 String modifiedBy = userInfoHolder.getUser().getUserId();
 ServerConfig storedConfig = serverConfigRepository.findByKey(serverConfig.getKey());
 if (Objects.isNull(storedConfig)) {//create
  serverConfig.setDataChangeCreatedBy(modifiedBy);
  serverConfig.setDataChangeLastModifiedBy(modifiedBy);
  serverConfig.setId(0L);//为空，设置ID 为0，jpa执行新增操作
  return serverConfigRepository.save(serverConfig);
 } else {//update
  BeanUtils.copyEntityProperties(serverConfig, storedConfig);
  storedConfig.setDataChangeLastModifiedBy(modifiedBy);
  return serverConfigRepository.save(storedConfig);
 }
}

代码示例来源：origin: baomidou/mybatis-plus

/**
 * 插入 OR 更新
 */
public boolean insertOrUpdate() {
  return StringUtils.checkValNull(pkVal()) || Objects.isNull(selectById(pkVal())) ? insert() : updateById();
}

代码示例来源：origin: Graylog2/graylog2-server

@Override
public Graph<EntityDescriptor> resolveNativeEntity(EntityDescriptor entityDescriptor) {
  final MutableGraph<EntityDescriptor> mutableGraph = GraphBuilder.directed().build();
  mutableGraph.addNode(entityDescriptor);
  final ModelId modelId = entityDescriptor.id();
  final Configuration configuration = configurationService.find(modelId.id());
  if (isNull(configuration)) {
    LOG.debug("Could not find configuration {}", entityDescriptor);
  } else {
    final EntityDescriptor collectorEntityDescriptor = EntityDescriptor.create(
        configuration.collectorId(), ModelTypes.SIDECAR_COLLECTOR_V1);
    mutableGraph.putEdge(entityDescriptor, collectorEntityDescriptor);
  }
  return ImmutableGraph.copyOf(mutableGraph);
}

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