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

Strings.emptyToNull介绍

[英]Returns the given string if it is nonempty; null otherwise.
[中]如果给定字符串为非空，则返回该字符串；否则为空。

代码示例

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

@Override
  public String getNodeId() {
    return emptyToNull((String)fields.get(MessageInput.FIELD_NODE_ID));
  }
}

代码示例来源：origin: prestodb/presto

private static String trimEmptyToNull(String value)
{
  return emptyToNull(nullToEmpty(value).trim());
}

代码示例来源：origin: SonarSource/sonarqube

public Component(String uuid, @Nullable String key, @Nullable String name) {
 this.uuid = requireNonNull(emptyToNull(uuid), "uuid can't be null nor empty");
 this.key = emptyToNull(key);
 this.name = emptyToNull(name);
}

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

public static String cut(String s, String splitChar, int index) {
  if (s == null || splitChar == null || index < 0) {
    return null;
  }
  final String[] parts = s.split(Pattern.quote(splitChar));
  if (parts.length <= index) {
    return null;
  }
  return emptyToNull(parts[index]);
}

代码示例来源：origin: prestodb/presto

public PrestoNode(String nodeIdentifier, URI httpUri, NodeVersion nodeVersion, boolean coordinator)
{
  nodeIdentifier = emptyToNull(nullToEmpty(nodeIdentifier).trim());
  this.nodeIdentifier = requireNonNull(nodeIdentifier, "nodeIdentifier is null or empty");
  this.httpUri = requireNonNull(httpUri, "httpUri is null");
  this.nodeVersion = requireNonNull(nodeVersion, "nodeVersion is null");
  this.coordinator = coordinator;
}

代码示例来源：origin: prestodb/presto

public static Optional<String> defaultCredentialCachePath()
  {
    String value = nullToEmpty(System.getenv("KRB5CCNAME"));
    if (value.startsWith(FILE_PREFIX)) {
      value = value.substring(FILE_PREFIX.length());
    }
    return Optional.ofNullable(emptyToNull(value));
  }
}

代码示例来源：origin: apache/incubator-druid

/**
 * Returns the given string if it is nonempty; {@code null} otherwise.
 * This method should only be used at places where null to empty conversion is
 * irrelevant to null handling of the data.
 *
 * @param string the string to test and possibly return
 *
 * @return {@code string} itself if it is nonempty; {@code null} if it is
 * empty or null
 */
@Nullable
public static String emptyToNullNonDruidDataString(@Nullable String string)
{
 //CHECKSTYLE.OFF: Regexp
 return Strings.emptyToNull(string);
 //CHECKSTYLE.ON: Regexp
}

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

private static DateTimeZone buildTimeZone(Object timeZoneId) {
  if (timeZoneId instanceof String) {
    try {
      final String timeZoneString = (String) timeZoneId;
      final String zoneId = firstNonNull(emptyToNull(timeZoneString.trim()), "Etc/UTC");
      return DateTimeZone.forID(zoneId);
    } catch (IllegalArgumentException e) {
      return DEFAULT_TIME_ZONE;
    }
  } else {
    return DEFAULT_TIME_ZONE;
  }
}

代码示例来源：origin: apache/incubator-druid

@Nullable
public static String emptyToNullIfNeeded(@Nullable String value)
{
 //CHECKSTYLE.OFF: Regexp
 return replaceWithDefault() ? Strings.emptyToNull(value) : value;
 //CHECKSTYLE.ON: Regexp
}

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

@JsonCreator
  public static MatchingType valueOfOrDefault(String name) {
    return (emptyToNull(name) == null ? DEFAULT : valueOf(name));
  }
}

代码示例来源：origin: prestodb/presto

public static String preprocessQuery(Optional<String> catalog, Optional<String> schema, String query)
    throws QueryPreprocessorException
{
  Duration timeout = DEFAULT_PREPROCESSOR_TIMEOUT;
  String timeoutEnvironment = nullToEmpty(System.getenv(ENV_PREPROCESSOR_TIMEOUT)).trim();
  if (!timeoutEnvironment.isEmpty()) {
    timeout = Duration.valueOf(timeoutEnvironment);
  }
  String preprocessorCommand = System.getenv(ENV_PREPROCESSOR);
  if (emptyToNull(preprocessorCommand) == null) {
    return query;
  }
  return preprocessQuery(catalog, schema, query, ImmutableList.of("/bin/sh", "-c", preprocessorCommand), timeout);
}

代码示例来源：origin: SonarSource/sonarqube

@Override
public String create(UserDto user) {
 UserDto userDto = requireNonNull(user, "User cannot be null");
 return hash(requireNonNull(emptyToNull(userDto.getEmail()), "Email cannot be null"));
}

代码示例来源：origin: google/guava

public void testEmptyToNull() {
 assertNull(Strings.emptyToNull(null));
 assertNull(Strings.emptyToNull(""));
 assertEquals("a", Strings.emptyToNull("a"));
}

代码示例来源：origin: SonarSource/sonarqube

@CheckForNull
private String getAssignee(Request request) {
 String assignee = emptyToNull(request.param(PARAM_ASSIGNEE));
 if (ASSIGN_TO_ME_VALUE.equals(assignee) || BooleanUtils.isTrue(request.paramAsBoolean(DEPRECATED_PARAM_ME))) {
  return userSession.getLogin();
 }
 return assignee;
}

代码示例来源：origin: prestodb/presto

public static Column fromMetastoreApiFieldSchema(FieldSchema fieldSchema)
{
  return new Column(fieldSchema.getName(), HiveType.valueOf(fieldSchema.getType()), Optional.ofNullable(emptyToNull(fieldSchema.getComment())));
}

代码示例来源：origin: SonarSource/sonarqube

private Users.User.Builder formatUser(UserDto user) {
 Users.User.Builder builder = Users.User.newBuilder()
  .setLogin(user.getLogin())
  .setName(nullToEmpty(user.getName()))
  .setActive(user.isActive());
 ofNullable(emptyToNull(user.getEmail())).ifPresent(email -> builder.setAvatar(avatarFactory.create(user)));
 return builder;
}

代码示例来源：origin: SonarSource/sonarqube

private SearchUsersResponse.User toUser(UserDto user, boolean isSelected) {
 SearchUsersResponse.User.Builder builder = SearchUsersResponse.User.newBuilder()
  .setLogin(user.getLogin())
  .setName(user.getName())
  .setSelected(isSelected);
 ofNullable(emptyToNull(user.getEmail())).ifPresent(e -> builder.setAvatar(avatarResolver.create(user)));
 return builder
  .build();
}

代码示例来源：origin: SonarSource/sonarqube

private AddMemberWsResponse buildResponse(UserDto user, int groups) {
 AddMemberWsResponse.Builder response = AddMemberWsResponse.newBuilder();
 User.Builder wsUser = User.newBuilder()
  .setLogin(user.getLogin())
  .setName(user.getName())
  .setGroupCount(groups);
 ofNullable(emptyToNull(user.getEmail())).ifPresent(text -> wsUser.setAvatar(avatarResolver.create(user)));
 response.setUser(wsUser);
 return response.build();
}

代码示例来源：origin: SonarSource/sonarqube

private static ActiveRule convert(ScannerReport.ActiveRule input, Rule rule) {
  RuleKey key = RuleKey.of(input.getRuleRepository(), input.getRuleKey());
  Map<String, String> params = new HashMap<>(input.getParamsByKeyMap());
  long updatedAt = input.getUpdatedAt();
  return new ActiveRule(key, input.getSeverity().name(), params, updatedAt == 0 ? input.getCreatedAt() : updatedAt, rule.getPluginKey(), emptyToNull(input.getQProfileKey()));
 }
}

代码示例来源：origin: SonarSource/sonarqube

private static CreateWsResponse buildResponse(UserDto userDto) {
 CreateWsResponse.User.Builder userBuilder = CreateWsResponse.User.newBuilder()
  .setLogin(userDto.getLogin())
  .setName(userDto.getName())
  .setActive(userDto.isActive())
  .setLocal(userDto.isLocal())
  .addAllScmAccounts(userDto.getScmAccountsAsList());
 ofNullable(emptyToNull(userDto.getEmail())).ifPresent(userBuilder::setEmail);
 return CreateWsResponse.newBuilder().setUser(userBuilder).build();
}