lc_render/
error.rs

1/// Render error return type.
2#[derive(Debug)]
3pub enum Error {
4    /// Count of categories on scale doesn't equal to values count.
5    /// Some views have that restriction.
6    CategoriesCountDoesntEqual,
7
8    /// Count of categories on scale is less than values count.
9    /// Some views have that restriction.
10    CategoriesCountIsLess,
11
12    /// Provided dataset is empty.
13    DataIsEmpty,
14
15    /// Could not save file.
16    SaveFileError(std::io::Error),
17}
18
19impl std::fmt::Display for Error {
20    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
21        match &*self {
22            Error::CategoriesCountDoesntEqual => "categories count doesn't equal to data elements count and it's not supported for the selected view".to_string().fmt(f),
23            Error::CategoriesCountIsLess => "categories count is less than data elements count and it's not supported for the selected view".to_string().fmt(f),
24            Error::DataIsEmpty => "provided data vector is empty".to_string().fmt(f),
25            Error::SaveFileError(err) => format!("failed to save file, error: {}", err).fmt(f),
26        }
27    }
28}
29
30impl std::error::Error for Error {}
31
32impl std::convert::From<std::io::Error> for Error {
33    fn from(e: std::io::Error) -> Self {
34        Error::SaveFileError(e)
35    }
36}
37
38#[cfg(test)]
39mod tests {
40    use super::*;
41
42    #[test]
43    fn impl_error() {
44        #[derive(Debug)]
45        struct B(Option<Box<dyn std::error::Error + 'static>>);
46
47        impl std::fmt::Display for B {
48            fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
49                write!(f, "B")
50            }
51        }
52
53        impl std::error::Error for B {}
54
55        let err = B(Some(Box::new(Error::DataIsEmpty)));
56
57        let _err = &err as &(dyn std::error::Error);
58    }
59}
lc_render/error.rs

lc_render/
error.rs
