本文整理了Java中com.google.common.base.Strings.isNullOrEmpty()方法的一些代码示例，展示了Strings.isNullOrEmpty()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。Strings.isNullOrEmpty()方法的具体详情如下：
包路径：com.google.common.base.Strings
类名称：Strings
方法名：isNullOrEmpty

Strings.isNullOrEmpty介绍

[英]Returns true if the given string is null or is the empty string.

Consider normalizing your string references with #nullToEmpty. If you do, you can use String#isEmpty() instead of this method, and you won't need special null-safe forms of methods like String#toUpperCase either. Or, if you'd like to normalize "in the other direction," converting empty strings to null, you can use #emptyToNull.
[中]如果给定字符串为null或为空字符串，则返回true。
考虑用y0 null to空对字符串引用进行规范化。如果这样做，可以使用String#isEmpty（）而不是这个方法，而且也不需要像String#toUpperCase这样的特殊空安全形式的方法。或者，如果希望“在另一个方向”进行规范化，将空字符串转换为null，可以使用#emptyToNull。

代码示例

代码示例来源：origin: prestodb/presto

private void setTableName(String tableName)
{
  checkArgument(!isNullOrEmpty(tableName), "tableName is null or empty string");
  this.tableName = tableName;
}

代码示例来源：origin: apache/incubator-shardingsphere

/**
 * Get logic schema.
 *
 * @param schemaName schema name
 * @return sharding schema
 */
public LogicSchema getLogicSchema(final String schemaName) {
  return Strings.isNullOrEmpty(schemaName) ? null : logicSchemas.get(schemaName);
}

代码示例来源：origin: ctripcorp/apollo

private String assembleInstanceKey(String appId, String cluster, String ip, String datacenter) {
 List<String> keyParts = Lists.newArrayList(appId, cluster, ip);
 if (!Strings.isNullOrEmpty(datacenter)) {
  keyParts.add(datacenter);
 }
 return STRING_JOINER.join(keyParts);
}

代码示例来源：origin: SonarSource/sonarqube

void addMainClass(String pluginKey, @Nullable String mainClass) {
 if (!Strings.isNullOrEmpty(mainClass)) {
  mainClassesByPluginKey.put(pluginKey, mainClass);
 }
}

代码示例来源：origin: ctripcorp/apollo

private Map<String, ApolloConfigNotification> filterNotifications(String appId,
                                 List<ApolloConfigNotification> notifications) {
 Map<String, ApolloConfigNotification> filteredNotifications = Maps.newHashMap();
 for (ApolloConfigNotification notification : notifications) {
  if (Strings.isNullOrEmpty(notification.getNamespaceName())) {
   continue;
  }
  //strip out .properties suffix
  String originalNamespace = namespaceUtil.filterNamespaceName(notification.getNamespaceName());
  notification.setNamespaceName(originalNamespace);
  //fix the character case issue, such as FX.apollo <-> fx.apollo
  String normalizedNamespace = namespaceUtil.normalizeNamespace(appId, originalNamespace);
  // in case client side namespace name has character case issue and has difference notification ids
  // such as FX.apollo = 1 but fx.apollo = 2, we should let FX.apollo have the chance to update its notification id
  // which means we should record FX.apollo = 1 here and ignore fx.apollo = 2
  if (filteredNotifications.containsKey(normalizedNamespace) &&
    filteredNotifications.get(normalizedNamespace).getNotificationId() < notification.getNotificationId()) {
   continue;
  }
  filteredNotifications.put(normalizedNamespace, notification);
 }
 return filteredNotifications;
}

代码示例来源：origin: SonarSource/sonarqube

private static String transition(Map<String, Object> properties) {
 String param = (String) properties.get(TRANSITION_PARAMETER);
 checkArgument(!isNullOrEmpty(param), "Missing parameter : 'transition'");
 return param;
}

代码示例来源：origin: ctripcorp/apollo

public List<AppNamespace> findByAppIdAndNamespaces(String appId, Set<String> namespaceNames) {
 Preconditions.checkArgument(!Strings.isNullOrEmpty(appId), "appId must not be null");
 if (namespaceNames == null || namespaceNames.isEmpty()) {
  return Collections.emptyList();
 }
 List<AppNamespace> result = Lists.newArrayList();
 for (String namespaceName : namespaceNames) {
  AppNamespace appNamespace = appNamespaceCache.get(STRING_JOINER.join(appId, namespaceName));
  if (appNamespace != null) {
   result.add(appNamespace);
  }
 }
 return result;
}

代码示例来源：origin: SonarSource/sonarqube

private DefaultHeaders setValue(String name, @Nullable String value) {
 checkArgument(!isNullOrEmpty(name));
 if (value == null) {
  keyValues.remove(name);
 } else {
  keyValues.put(name, value);
 }
 return this;
}

代码示例来源：origin: apache/incubator-shardingsphere

/**
 * Get logic schema.
 *
 * @param schemaName schema name
 * @return sharding schema
 */
public LogicSchema getLogicSchema(final String schemaName) {
  return Strings.isNullOrEmpty(schemaName) ? null : logicSchemas.get(schemaName);
}

代码示例来源：origin: ctripcorp/apollo

private String assembleKey(String appId, String cluster, String namespace, String dataCenter) {
 List<String> keyParts = Lists.newArrayList(appId, cluster, namespace);
 if (!Strings.isNullOrEmpty(dataCenter)) {
  keyParts.add(dataCenter);
 }
 return keyParts.stream().collect(Collectors.joining(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR));
}

代码示例来源：origin: elasticjob/elastic-job-lite

private Map<String, Object> getQueryParameters(final UriInfo info, final String[] params) {
    final Map<String, Object> result = new HashMap<>();
    for (String each : params) {
      if (!Strings.isNullOrEmpty(info.getQueryParameters().getFirst(each))) {
        result.put(each, info.getQueryParameters().getFirst(each));
      }
    }
    return result;
  }
}

代码示例来源：origin: ctripcorp/apollo

private void updateRemoteNotifications(List<ApolloConfigNotification> deltaNotifications) {
 for (ApolloConfigNotification notification : deltaNotifications) {
  if (Strings.isNullOrEmpty(notification.getNamespaceName())) {
   continue;
  }
  if (notification.getMessages() == null || notification.getMessages().isEmpty()) {
   continue;
  }
  ApolloNotificationMessages localRemoteMessages =
    m_remoteNotificationMessages.get(notification.getNamespaceName());
  if (localRemoteMessages == null) {
   localRemoteMessages = new ApolloNotificationMessages();
   m_remoteNotificationMessages.put(notification.getNamespaceName(), localRemoteMessages);
  }
  localRemoteMessages.mergeFrom(notification.getMessages());
 }
}

代码示例来源：origin: SonarSource/sonarqube

private static String verifySeverityParameter(Map<String, Object> properties) {
  String param = (String) properties.get(SEVERITY_PARAMETER);
  checkArgument(!isNullOrEmpty(param), "Missing parameter : '%s'", SEVERITY_PARAMETER);
  return param;
 }
}

代码示例来源：origin: SonarSource/sonarqube

private static List<IssuePattern> loadPatterns(String propertyKey, Configuration settings) {
 List<IssuePattern> patterns = new ArrayList<>();
 String patternConf = settings.get(propertyKey).orElse("");
 for (String id : Splitter.on(",").omitEmptyStrings().split(patternConf)) {
  String propPrefix = propertyKey + "." + id + ".";
  String componentPathPattern = settings.get(propPrefix + RESOURCE_KEY).orElse(null);
  checkArgument(!isNullOrEmpty(componentPathPattern), format("File path pattern cannot be empty. Please check '%s' settings", propertyKey));
  String ruleKeyPattern = settings.get(propPrefix + RULE_KEY).orElse(null);
  checkArgument(!isNullOrEmpty(ruleKeyPattern), format("Rule key pattern cannot be empty. Please check '%s' settings", propertyKey));
  patterns.add(new IssuePattern(componentPathPattern, ruleKeyPattern));
 }
 return patterns;
}

代码示例来源：origin: prestodb/presto

public MongoConnectorFactory(String name)
{
  checkArgument(!isNullOrEmpty(name), "name is null or empty");
  this.name = name;
}

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

public boolean stringIsSet(String key) {
  return !isNullOrEmpty(strings.get(key));
}

代码示例来源：origin: ctripcorp/apollo

String assembleCacheKey(ConfigFileOutputFormat outputFormat, String appId, String clusterName,
            String namespace,
            String dataCenter) {
 List<String> keyParts =
   Lists.newArrayList(outputFormat.getValue(), appId, clusterName, namespace);
 if (!Strings.isNullOrEmpty(dataCenter)) {
  keyParts.add(dataCenter);
 }
 return STRING_JOINER.join(keyParts);
}

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

@VisibleForTesting
static Map<String, String> parseHeaders(String headerString) {
  if (isNullOrEmpty(headerString)) {
    return Collections.emptyMap();
  }
  final Map<String, String> headers = Maps.newHashMap();
  for (String headerPart : headerString.trim().split(",")) {
    final String[] parts = headerPart.trim().split(":");
    if (parts.length == 2) {
      headers.put(parts[0].trim(), parts[1].trim());
    }
  }
  return headers;
}

代码示例来源：origin: SonarSource/sonarqube

private static void checkActionExtension(@Nullable String actionExtension) {
 if (isNullOrEmpty(actionExtension)) {
  return;
 }
 checkArgument(SUPPORTED_MEDIA_TYPES_BY_URL_SUFFIX.get(actionExtension.toLowerCase(Locale.ENGLISH)) != null, "Unknown action extension: %s", actionExtension);
}

代码示例来源：origin: prestodb/presto

private void setType(String type)
{
  checkArgument(!isNullOrEmpty(type), "type is null or empty string");
  this.type = type;
}