91 lines
2.5 KiB
Rust
91 lines
2.5 KiB
Rust
//! Errors reported while making a handover decision.
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use core::fmt;
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/// The category of a handover error.
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///
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/// 切换错误的类别。
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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#[non_exhaustive]
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pub enum HandoverErrorKind {
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/// The candidate list is empty.
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///
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/// 候选列表为空。
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NoCandidates,
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/// The same satellite appears more than once in the candidate list.
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///
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/// 同一卫星在候选列表中出现多次。
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DuplicateSatellite,
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/// A quality value is outside its range or not finite.
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///
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/// 某质量值超出取值范围或非有限。
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InvalidQuality,
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/// A policy parameter is not usable.
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///
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/// 某策略参数不可用。
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InvalidPolicy,
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}
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impl fmt::Display for HandoverErrorKind {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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let text = match self {
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Self::NoCandidates => "there are no candidates to choose from",
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Self::DuplicateSatellite => "a satellite appears more than once",
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Self::InvalidQuality => "a quality value is not usable",
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Self::InvalidPolicy => "a policy parameter is not usable",
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};
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f.write_str(text)
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}
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}
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/// A failure while making a handover decision.
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///
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/// 作出切换决策时发生的失败。
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub struct HandoverError {
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kind: HandoverErrorKind,
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detail: Option<String>,
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}
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impl HandoverError {
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/// Creates an error with the given category.
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///
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/// 用给定类别创建一个错误。
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pub fn new(kind: HandoverErrorKind) -> Self {
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Self { kind, detail: None }
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}
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/// Attaches a description of the values that caused the failure.
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///
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/// 附加对该失败所涉数值的说明。
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pub fn with_detail(mut self, detail: impl Into<String>) -> Self {
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self.detail = Some(detail.into());
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self
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}
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/// Returns the category of this failure.
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///
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/// 返回该失败的类别。
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pub fn kind(&self) -> HandoverErrorKind {
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self.kind
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}
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/// Returns the detail text attached to this error, if any.
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///
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/// 返回附加在该错误上的说明文本，若有。
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pub fn detail(&self) -> Option<&str> {
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self.detail.as_deref()
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}
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}
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impl fmt::Display for HandoverError {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match &self.detail {
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Some(detail) => write!(f, "{}: {detail}", self.kind),
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None => write!(f, "{}", self.kind),
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}
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}
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}
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impl core::error::Error for HandoverError {}
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