77 lines
2.3 KiB
Rust
77 lines
2.3 KiB
Rust
//! Errors reported while building or querying a resource.
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use core::fmt;
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/// The category of a resource error.
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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#[non_exhaustive]
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pub enum ResourceErrorKind {
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/// The end of an interval precedes its start.
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ReversedInterval,
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/// A time or duration is not finite.
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NotFinite,
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/// A duration is negative.
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NegativeDuration,
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/// The capacity is not positive and finite.
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InvalidCapacity,
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/// No resource has the requested identifier.
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NoSuchResource,
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/// A resource with the identifier already exists.
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DuplicateResource,
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}
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impl fmt::Display for ResourceErrorKind {
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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::ReversedInterval => "the interval ends before it starts",
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Self::NotFinite => "a time is not finite",
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Self::NegativeDuration => "the duration is negative",
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Self::InvalidCapacity => "the capacity is not usable",
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Self::NoSuchResource => "no such resource",
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Self::DuplicateResource => "a resource with that identifier exists",
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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 building or querying a resource.
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub struct ResourceError {
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kind: ResourceErrorKind,
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detail: Option<String>,
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}
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impl ResourceError {
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/// Creates an error with the given category.
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pub fn new(kind: ResourceErrorKind) -> 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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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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pub fn kind(&self) -> ResourceErrorKind {
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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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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 ResourceError {
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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 ResourceError {}
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