本文整理了Java中org.apache.commons.collections4.CollectionUtils.isEmpty()方法的一些代码示例，展示了CollectionUtils.isEmpty()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。CollectionUtils.isEmpty()方法的具体详情如下：
包路径：org.apache.commons.collections4.CollectionUtils
类名称：CollectionUtils
方法名：isEmpty

CollectionUtils.isEmpty介绍

[英]Null-safe check if the specified collection is empty.

Null returns true.
[中]空安全检查指定的集合是否为空。
Null返回true。

代码示例

代码示例来源：origin: org.apache.commons/commons-collections4

/**
 * Null-safe check if the specified collection is not empty.
 * <p>
 * Null returns false.
 *
 * @param coll  the collection to check, may be null
 * @return true if non-null and non-empty
 * @since 3.2
 */
public static boolean isNotEmpty(final Collection<?> coll) {
  return !isEmpty(coll);
}

代码示例来源：origin: gocd/gocd

private boolean validateUserSelection(List<String> userNames, BulkUpdateUsersOperationResult result) {
  if (CollectionUtils.isEmpty(userNames)) {
    result.badRequest("No users selected.");
    return false;
  }
  return true;
}

代码示例来源：origin: ethereum/ethereumj

public void addLogInfos(List<LogInfo> logInfos) {
  if (!isEmpty(logInfos)) {
    getLogInfoList().addAll(logInfos);
  }
}

代码示例来源：origin: ethereum/ethereumj

public void addTouchAccounts(Set<byte[]> accounts) {
  if (!isEmpty(accounts)) {
    getTouchedAccounts().addAll(accounts);
  }
}

代码示例来源：origin: ethereum/ethereumj

public void addDeleteAccounts(Set<DataWord> accounts) {
  if (!isEmpty(accounts)) {
    getDeleteAccounts().addAll(accounts);
  }
}

代码示例来源：origin: BroadleafCommerce/BroadleafCommerce

@Override
public Customer readCustomerByUsername(String username, Boolean cacheable) {
  List<Customer> customers = readCustomersByUsername(username, cacheable);
  return CollectionUtils.isEmpty(customers) ? null : customers.get(0);
}

代码示例来源：origin: BroadleafCommerce/BroadleafCommerce

@Override
public Customer readCustomerByEmail(String emailAddress) {
  List<Customer> customers = readCustomersByEmail(emailAddress);
  return CollectionUtils.isEmpty(customers) ? null : customers.get(0);
}

代码示例来源：origin: BroadleafCommerce/BroadleafCommerce

@Override
public Customer readCustomerByExternalId(String id) {
  CriteriaBuilder builder = em.getCriteriaBuilder();
  CriteriaQuery<Customer> criteria = builder.createQuery(Customer.class);
  Root<? extends Customer> customer = criteria.from(entityConfiguration.lookupEntityClass(Customer.class.getName(), Customer.class));
  criteria.select(customer);
  criteria.where(builder.equal(customer.get("externalId"), id));
  TypedQuery<Customer> query = em.createQuery(criteria);
  query.setHint(QueryHints.HINT_CACHEABLE, false);
  query.setHint(QueryHints.HINT_CACHE_REGION, "query.Customer");
  List<Customer> resultList = query.getResultList();
  return CollectionUtils.isEmpty(resultList) ? null : resultList.get(0);
}

代码示例来源：origin: apache/nifi

private static boolean isEmpty(final ProcessGroupDTO dto) {
  if (dto == null) {
    return true;
  }
  final FlowSnippetDTO contents = dto.getContents();
  if (contents == null) {
    return true;
  }
  return CollectionUtils.isEmpty(contents.getProcessors())
      && CollectionUtils.isEmpty(contents.getConnections())
      && CollectionUtils.isEmpty(contents.getFunnels())
      && CollectionUtils.isEmpty(contents.getLabels())
      && CollectionUtils.isEmpty(contents.getOutputPorts())
      && CollectionUtils.isEmpty(contents.getProcessGroups())
      && CollectionUtils.isEmpty(contents.getProcessors())
      && CollectionUtils.isEmpty(contents.getRemoteProcessGroups());
}

代码示例来源：origin: yanzhenjie/AndServer

@Override
public boolean process(Set<? extends TypeElement> set, RoundEnvironment roundEnv) {
  if (CollectionUtils.isEmpty(set)) return false;
  Map<String, TypeElement> converterMap = findAnnotation(roundEnv);
  if (!converterMap.isEmpty()) createRegister(converterMap);
  return true;
}

代码示例来源：origin: yanzhenjie/AndServer

@Override
public boolean process(Set<? extends TypeElement> set, RoundEnvironment roundEnv) {
  if (CollectionUtils.isEmpty(set)) return false;
  Map<String, List<TypeElement>> interceptorMap = findAnnotation(roundEnv);
  if (!interceptorMap.isEmpty()) createRegister(interceptorMap);
  return true;
}

代码示例来源：origin: yanzhenjie/AndServer

@Override
public boolean process(Set<? extends TypeElement> set, RoundEnvironment roundEnv) {
  if (CollectionUtils.isEmpty(set)) return false;
  Map<String, List<TypeElement>> websiteMap = findAnnotation(roundEnv);
  if (!websiteMap.isEmpty()) createRegister(websiteMap);
  return true;
}

代码示例来源：origin: yanzhenjie/AndServer

@Override
public boolean process(Set<? extends TypeElement> set, RoundEnvironment roundEnv) {
  if (CollectionUtils.isEmpty(set)) return false;
  Map<String, TypeElement> resolverMap = findAnnotation(roundEnv);
  if (!resolverMap.isEmpty()) createRegister(resolverMap);
  return true;
}

代码示例来源：origin: BroadleafCommerce/BroadleafCommerce

protected Sku findMatchingSku(Product product, Map<String, String> attributeValuesForSku) {
  Sku matchingSku = null;
  List<Long> possibleSkuIds = new ArrayList<>();
  for (Map.Entry<String, String> entry : MapUtils.emptyIfNull(attributeValuesForSku).entrySet()) {
    possibleSkuIds = productOptionValidationService.findSkuIdsForProductOptionValues(product.getId(), entry.getKey(), entry.getValue(), possibleSkuIds);
    if (CollectionUtils.isEmpty(possibleSkuIds)) {
      break;
    }
  }
  if (CollectionUtils.isNotEmpty(possibleSkuIds)) {
    matchingSku = catalogService.findSkuById(possibleSkuIds.iterator().next());
  }
  return matchingSku;
}

代码示例来源：origin: yanzhenjie/AndServer

private void findMapping(Set<? extends Element> set, Map<TypeElement, List<ExecutableElement>> controllerMap) {
  for (Element element : set) {
    if (element instanceof ExecutableElement) {
      ExecutableElement execute = (ExecutableElement)element;
      Element enclosing = element.getEnclosingElement();
      if (!(enclosing instanceof TypeElement)) continue;
      TypeElement type = (TypeElement)enclosing;
      Annotation restController = type.getAnnotation(RestController.class);
      Annotation controller = type.getAnnotation(Controller.class);
      if (restController == null && controller == null) {
        mLog.w(String.format("Controller/RestController annotations may be missing on %s.",
          type.getQualifiedName()));
        continue;
      }
      String host = type.getQualifiedName() + "#" + execute.getSimpleName() + "()";
      Set<Modifier> modifiers = execute.getModifiers();
      Validate.isTrue(!modifiers.contains(Modifier.PRIVATE), "The modifier private is redundant on %s.",
        host);
      if (modifiers.contains(Modifier.STATIC)) {
        mLog.w(String.format("The modifier static is redundant on %s.", host));
      }
      List<ExecutableElement> elementList = controllerMap.get(type);
      if (CollectionUtils.isEmpty(elementList)) {
        elementList = new ArrayList<>();
        controllerMap.put(type, elementList);
      }
      elementList.add(execute);
    }
  }
}

代码示例来源：origin: yanzhenjie/AndServer

@Override
public boolean process(Set<? extends TypeElement> set, RoundEnvironment roundEnv) {
  if (CollectionUtils.isEmpty(set)) return false;
  Map<TypeElement, List<ExecutableElement>> controllers = new HashMap<>();
  findMapping(roundEnv.getElementsAnnotatedWith(RequestMapping.class), controllers);
  findMapping(roundEnv.getElementsAnnotatedWith(GetMapping.class), controllers);
  findMapping(roundEnv.getElementsAnnotatedWith(PostMapping.class), controllers);
  findMapping(roundEnv.getElementsAnnotatedWith(PutMapping.class), controllers);
  findMapping(roundEnv.getElementsAnnotatedWith(PatchMapping.class), controllers);
  findMapping(roundEnv.getElementsAnnotatedWith(DeleteMapping.class), controllers);
  if (!controllers.isEmpty()) createHandlerAdapter(controllers);
  return true;
}

代码示例来源：origin: BroadleafCommerce/BroadleafCommerce

protected boolean canSellDefaultSku(Product product) {
  return CollectionUtils.isEmpty(product.getAdditionalSkus()) || product.getCanSellWithoutOptions();
}

代码示例来源：origin: Netflix/Priam

public static final boolean isRestoreEnabled(IConfiguration conf, InstanceInfo instanceInfo) {
  boolean isRestoreMode = StringUtils.isNotBlank(conf.getRestoreSnapshot());
  boolean isBackedupRac =
      (CollectionUtils.isEmpty(conf.getBackupRacs())
          || conf.getBackupRacs().contains(instanceInfo.getRac()));
  return (isRestoreMode && isBackedupRac);
}

代码示例来源：origin: BroadleafCommerce/BroadleafCommerce

protected void updateOrderItemCartMessages(OrderItem orderItem) {
  List<String> cartMessages = gatherOrderItemCartMessages(orderItem);
  if (CollectionUtils.isEmpty(cartMessages)) {
    cartMessages = gatherProductCartMessages(orderItem);
  }
  orderItem.setCartMessages(cartMessages);
  orderItemService.saveOrderItem(orderItem);
}

代码示例来源：origin: BroadleafCommerce/BroadleafCommerce

@Override
@Transactional(TransactionUtils.DEFAULT_TRANSACTION_MANAGER)
public GenericResponse sendForgotUsernameNotification(String emailAddress) {
  GenericResponse response = new GenericResponse();
  List<Customer> customers = null;
  if (emailAddress != null) {
    customers = customerDao.readCustomersByEmail(emailAddress);
  }
  if (CollectionUtils.isEmpty(customers)) {
    response.addErrorCode("notFound");
  } else {
    List<String> activeUsernames = new ArrayList<String>();
    for (Customer customer : customers) {
      if (!customer.isDeactivated()) {
        activeUsernames.add(customer.getUsername());
      }
    }
    if (activeUsernames.size() > 0) {
      HashMap<String, Object> vars = new HashMap<String, Object>();
      vars.put("userNames", activeUsernames);
      sendEmail(emailAddress, getForgotUsernameEmailInfo(), vars);
    } else {
      // send inactive username found email.
      response.addErrorCode("inactiveUser");
    }
  }
  return response;
}