Enum ExternalDataReason 

#[non_exhaustive]
pub enum ExternalDataReason {
    FeatureNotEnabled {
        feature: &'static str,
        mime: Option<String>,
    },
    FileMissing,
    PathMissing(String),
    UuidMismatch {
        expected: String,
        found: String,
    },
    Backend(String),
    ShapeDisagrees {
        promised: i64,
        held: usize,
    },
}

Why an array could not be read.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

FeatureNotEnabled

The support for this format is not compiled in.

A capability that is missing, not data that is absent - the caller must be able to tell the two apart, which is why this is not a plain “not found”. Enable the matching feature, or supply the file yourself.

Fields

feature: &'static str

The Cargo feature that would have handled it, e.g. hdf5.

mime: Option<String>

MIME type the object declared, when it declared one.

FileMissing

The file is named by the package but nothing was found under that name.

PathMissing(String)

The file was found but the dataset path inside it was not.

UuidMismatch

The file identifies itself with a different uuid than the package says.

The EPC specification requires an HDF5 file to carry, at its root, a uuid attribute equal to that of its EpcExternalPartReference. A mismatch means this is somebody else’s file.

Fields

expected: String

What the package expected.

found: String

What the file claims.

Backend(String)

The backend failed for a reason of its own.

ShapeDisagrees

The shape and the values of an array being written disagree.

Checked before the backend is asked, because a shape that promises more numbers than there are writes without error in some formats and reads back with zeros at the end - plausible values that nothing flags. Both counts are named: it is their difference that says what to fix.

Fields

promised: i64

How many the shape promises.

held: usize

How many the block holds.

Trait Implementations

impl Clone for ExternalDataReason

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ExternalDataReason

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for ExternalDataReason

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for ExternalDataReason

impl PartialEq for ExternalDataReason

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ExternalDataReason