104 lines
2.9 KiB
Rust
104 lines
2.9 KiB
Rust
//! Errors reported while routing.
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use core::fmt;
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/// The category of a routing error.
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///
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/// 路由错误的类别。
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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#[non_exhaustive]
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pub enum RoutingErrorKind {
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/// A node index is outside the range of the graph.
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///
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/// 节点下标超出该图的取值范围。
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NoSuchNode,
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/// No route exists between the two nodes.
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///
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/// 两节点之间不存在路由。
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NoRoute,
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/// The two endpoints are the same node.
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///
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/// 两个端点是同一节点。
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SameEndpoint,
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/// The interval is empty or not ordered.
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///
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/// 区间为空或次序不对。
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InvalidInterval,
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/// The topology series does not cover the requested interval.
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///
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/// 拓扑序列未覆盖所请求的区间。
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SeriesTooShort,
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}
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impl fmt::Display for RoutingErrorKind {
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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::NoSuchNode => "no such node",
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Self::NoRoute => "no route exists between these nodes",
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Self::SameEndpoint => "the source and destination are the same node",
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Self::InvalidInterval => "the interval is not usable",
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Self::SeriesTooShort => "the topology series does not cover the interval",
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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 routing.
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///
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/// 路由时发生的失败。
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub struct RoutingError {
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kind: RoutingErrorKind,
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detail: Option<String>,
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}
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impl RoutingError {
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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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///
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/// 用给定类别创建一个错误。
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pub fn new(kind: RoutingErrorKind) -> 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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///
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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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///
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/// 返回该失败的类别。
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pub fn kind(&self) -> RoutingErrorKind {
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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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///
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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 RoutingError {
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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 RoutingError {}
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