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use crate::error::{Error, Kind};
use std::convert::TryInto;
use std::{
convert::TryFrom,
fmt::{self, Debug, Display},
str::FromStr,
};
#[derive(Copy, Clone, Eq, Hash, PartialEq, PartialOrd, Ord)]
pub struct ValidatorIndex(u32);
impl TryFrom<i32> for ValidatorIndex {
type Error = Error;
fn try_from(value: i32) -> Result<Self, Self::Error> {
Ok(ValidatorIndex(
value.try_into().map_err(|_| Kind::NegativeValidatorIndex)?,
))
}
}
impl From<ValidatorIndex> for i32 {
fn from(value: ValidatorIndex) -> Self {
value.value() as i32
}
}
impl TryFrom<u32> for ValidatorIndex {
type Error = Error;
fn try_from(value: u32) -> Result<Self, Self::Error> {
if value > i32::MAX as u32 {
return Err(Kind::IntegerOverflow.into());
}
Ok(ValidatorIndex(value))
}
}
impl From<ValidatorIndex> for u32 {
fn from(value: ValidatorIndex) -> Self {
value.value()
}
}
impl TryFrom<usize> for ValidatorIndex {
type Error = Error;
fn try_from(value: usize) -> Result<Self, Self::Error> {
Ok(ValidatorIndex(
value.try_into().map_err(|_| Kind::IntegerOverflow)?,
))
}
}
impl From<ValidatorIndex> for usize {
fn from(value: ValidatorIndex) -> Self {
value
.value()
.try_into()
.expect("Integer overflow: system usize maximum smaller than i32 maximum")
}
}
impl ValidatorIndex {
pub fn value(&self) -> u32 {
self.0
}
}
impl Debug for ValidatorIndex {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "vote::ValidatorIndex({})", self.0)
}
}
impl Display for ValidatorIndex {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.0)
}
}
impl FromStr for ValidatorIndex {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Error> {
ValidatorIndex::try_from(
s.parse::<u32>()
.map_err(|_| Kind::Parse.context("validator index decode"))?,
)
}
}