Trait ParamValue

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pub trait ParamValue {
Show 22 methods    // Required methods
    fn is_empty(&self) -> bool;
    fn is_i64(&self) -> bool;
    fn is_f64(&self) -> bool;
    fn is_buffer(&self) -> bool;
    fn is_str(&self) -> bool;
    fn is_list(&self) -> bool;
    fn is_boolean(&self) -> bool;
    fn to_f64(&self) -> Result<f64, ParamValueParseError>;
    fn to_bool(&self) -> Result<bool, ParamValueParseError>;
    fn to_i64(&self) -> Result<i64, ParamValueParseError>;
    fn to_str(&self) -> Cow<'_, str>;
    fn to_buffer(&self) -> Result<Cow<'_, [u8]>, ParamValueParseError>;
    fn as_slice(&self) -> Cow<'_, [Value]>;
    fn parse<T: FromStr>(&self) -> Result<T, T::Err>;
    fn as_bytes(&self) -> Cow<'_, [u8]>;
    fn as_ref(&self) -> ValueRef<'_>;
    fn data_len(&self) -> usize;

    // Provided methods
    fn is_numeric(&self) -> bool { ... }
    fn to_f32(&self) -> Result<f32, ParamValueParseError> { ... }
    fn to_i32(&self) -> Result<i32, ParamValueParseError> { ... }
    fn to_u64(&self) -> Result<u64, ParamValueParseError> { ... }
    fn as_str(&self) -> Cow<'_, str> { ... }
}

Expand description

Access a parameter’s value, with specific coercion rules and eager type conversion.

Required Methods§

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fn is_empty(&self) -> bool

Check if the value is empty

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fn is_i64(&self) -> bool

Check if the value is an integer

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fn is_f64(&self) -> bool

Check if the value is a floating point number explicitly. An integral number might still be usable as a floating point number

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fn is_buffer(&self) -> bool

Check if the value is an arbitrary buffer

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fn is_str(&self) -> bool

Check if the value is stored as an explicit string. All variants can be coerced to a string.

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fn is_list(&self) -> bool

Check if the value is a list

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fn is_boolean(&self) -> bool

Check if the value is a boolean

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fn to_f64(&self) -> Result<f64, ParamValueParseError>

Get the value as an f64, if possible

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fn to_bool(&self) -> Result<bool, ParamValueParseError>

Get the value as a bool, if possible

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fn to_i64(&self) -> Result<i64, ParamValueParseError>

Get the value as an i64, if possible

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fn to_str(&self) -> Cow<'_, str>

Get the value as a string

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fn to_buffer(&self) -> Result<Cow<'_, [u8]>, ParamValueParseError>

Get the value as a byte buffer, if possible.

The intent here is distinct from ParamValue::as_bytes. The byte buffer represents the byte representation of the native value, while ParamValue::as_bytes is a byte string of the string representation.

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