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use thiserror::Error as DeriveError;
use crate::{H3Cell, Index, H3_MAX_RESOLUTION};
/// Errors as defines in [RFC] 4.0.0, extended with some custom errors of this wrapper library.
///
/// [RFC]: https://github.com/uber/h3/blob/master/dev-docs/RFCs/v4.0.0/error-handling-rfc.md
#[derive(Debug, DeriveError)]
pub enum Error {
/// The operation failed but a more specific error is not available
#[error("operation failed")]
Failed, // 1
/// Argument was outside of acceptable range (when a more specific error code is not available)
#[error("Argument was outside of acceptable range")]
Domain, // 2
/// Latitude or longitude arguments were outside of acceptable range
#[error("Latitude or longitude arguments were outside of acceptable range")]
LatLonDomain, // 3
/// Resolution argument was outside of acceptable range
#[error("Resolution argument was outside of acceptable range")]
ResDomain, // 4
/// H3Index cell argument was not valid
#[error("H3Index cell argument was not valid")]
CellInvalid, // 5
/// H3Index directed edge argument was not valid
#[error("H3Index directed edge argument was not valid")]
DirectedEdgeInvalid, // 6
/// H3Index undirected edge argument was not valid
#[error("H3Index undirected edge argument was not valid")]
UndirectedEdgeInvalid, // 7
/// H3Index vertex argument was not valid
#[error("H3Index vertex argument was not valid")]
VertexInvalid, // 8
/// Pentagon distortion was encountered which the algorithm could not handle it
#[error("Pentagon distortion was encountered")]
Pentagon, // 9
/// Duplicate input was encountered in the arguments and the algorithm could not handle it
#[error("Duplicate input was encountered in the arguments")]
DuplicateInput, // 10
/// H3Index cell arguments were not neighbors
#[error("H3Index cell arguments were not neighbors")]
NotNeighbors, // 11
/// H3Index cell arguments had incompatible resolutions
#[error("H3Index cell arguments had incompatible resolutions")]
ResMismatch, // 12
/// Necessary memory allocation failed
#[error("Necessary memory allocation failed")]
MemoryAlloc, // 13
/// Bounds of provided memory were not large enough
#[error("Bounds of provided memory were not large enough")]
MemoryBounds, // 14
/// Mode or flags argument was not valid.
#[error("Mode or flags argument was not valid")]
OptionInvalid, // 15
/// Unknown error code
#[error("Unknown h3 error code")]
UnknownError(u32),
/// Invalid H3 direction
#[error("Invalid H3 direction")]
DirectionInvalid(u8),
#[error("decompression error")]
DecompressionError(String),
}
impl Error {
/// returns the corresponding error for the given error code
const fn get_error(value: u32) -> Self {
match value {
1 => Self::Failed,
2 => Self::Domain,
3 => Self::LatLonDomain,
4 => Self::ResDomain,
5 => Self::CellInvalid,
6 => Self::DirectedEdgeInvalid,
7 => Self::UndirectedEdgeInvalid,
8 => Self::VertexInvalid,
9 => Self::Pentagon,
10 => Self::DuplicateInput,
11 => Self::NotNeighbors,
12 => Self::ResMismatch,
13 => Self::MemoryAlloc,
14 => Self::MemoryBounds,
15 => Self::OptionInvalid,
v => Self::UnknownError(v),
}
}
/// Checks if the H3 return value is an error
#[inline(always)]
pub const fn is_error(value: u32) -> bool {
value != 0
}
/// checks the return code of h3ron-h3-sys functions
#[inline(always)]
pub const fn check_returncode(value: u32) -> Result<(), Self> {
if Self::is_error(value) {
Err(Self::get_error(value))
} else {
Ok(())
}
}
}
/// Ensure two cells have the same resolution
pub fn check_same_resolution(cell0: H3Cell, cell1: H3Cell) -> Result<(), Error> {
let res0 = cell0.resolution();
let res1 = cell1.resolution();
if res0 == res1 {
Ok(())
} else {
Err(Error::ResMismatch)
}
}
/// Ensure the given resolution is valid
pub const fn check_valid_h3_resolution(h3_res: u8) -> Result<(), Error> {
if h3_res > H3_MAX_RESOLUTION {
Err(Error::ResDomain)
} else {
Ok(())
}
}