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//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
//
#[derive(Clone, Eq, PartialEq, Hash, Ord, PartialOrd)]
pub struct MqttString(String);
impl MqttString {
pub const MAX_LEN: usize = u16::MAX as usize;
}
impl std::str::FromStr for MqttString {
type Err = MqttStringError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
if s.len() > Self::MAX_LEN {
Err(MqttStringError::TooLong(s.len()))
} else {
Ok(Self(s.to_string()))
}
}
}
impl TryFrom<&str> for MqttString {
type Error = MqttStringError;
fn try_from(s: &str) -> Result<Self, Self::Error> {
<MqttString as std::str::FromStr>::from_str(s)
}
}
impl TryFrom<String> for MqttString {
type Error = MqttStringError;
fn try_from(s: String) -> Result<Self, Self::Error> {
if s.len() > Self::MAX_LEN {
Err(MqttStringError::TooLong(s.len()))
} else {
Ok(Self(s.to_string()))
}
}
}
impl AsRef<str> for MqttString {
fn as_ref(&self) -> &str {
self.0.as_ref()
}
}
impl std::fmt::Debug for MqttString {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
self.0.fmt(f)
}
}
#[derive(Debug, thiserror::Error)]
pub enum MqttStringError {
#[error("String of length {} is too long, max length is {}", .0, MqttString::MAX_LEN)]
TooLong(usize),
}
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