Struct ValueExtractor 

pub struct ValueExtractor;

Value extractor for @Value annotation equivalent @Value注解等价物的值提取器

Equivalent to Spring’s @Value annotation. 等价于Spring的@Value注解。

Example / 示例

use hiver_config::ValueExtractor;

// Equivalent to: @Value("${server.port:8080}")
let port: u16 = ValueExtractor::extract("server.port", Some(8080));

Implementations

impl ValueExtractor

pub fn extract<T>( key: &str, default: Option<T>, env: &Environment, ) -> Result<T, ConfigError>

where T: FromStr + DeserializeOwned, T::Err: Display,

Extract a value from environment 从环境提取值

pub fn extract_string( key: &str, default: Option<&str>, env: &Environment, ) -> Result<String, ConfigError>

Extract string value 提取字符串值

pub fn extract_bool( key: &str, default: Option<bool>, env: &Environment, ) -> Result<bool, ConfigError>

Extract boolean value 提取布尔值

pub fn extract_int<T>( key: &str, default: Option<T>, env: &Environment, ) -> Result<T, ConfigError>

where T: FromStr + DeserializeOwned, T::Err: Display,

Extract integer value 提取整数值

pub fn parse_placeholder(input: &str) -> (String, Option<String>)

Parse placeholder expression (e.g., “${key:default}”) 解析占位符表达式（例如 ${key:default}）

pub fn resolve_placeholder(input: &str, env: &Environment) -> String

Resolve placeholder expression with environment 使用环境解析占位符表达式