Enum MetadataField 

#[non_exhaustive]
pub enum MetadataField<T> {
    Missing,
    Present(T),
    Invalid(ViewError),
    UnsupportedSchema {
        description: String,
    },
}

The state of one known namespace metadata field.

Missing means that the field was absent from the metadata object. Present includes an empty collection. Invalid means the field belongs to the supported schema but contains invalid data. UnsupportedSchema means that the shape was understood but is outside the supported profile.

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.

Missing

Present(T)

Invalid(ViewError)

UnsupportedSchema

Fields

description: String

Implementations

impl<T> MetadataField<T>

pub fn as_ref(&self) -> MetadataField<&T>

Borrows a present value while preserving the field state.

pub fn present(&self) -> Option<&T>

Returns the owned value when the field is present and valid.

Trait Implementations

impl<T: Clone> Clone for MetadataField<T>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for MetadataField<T>

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

Formats the value using the given formatter.

impl<T: Eq> Eq for MetadataField<T>

impl<T: PartialEq> PartialEq for MetadataField<T>

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

Equality operator ==.

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

Inequality operator !=.

impl<T: PartialEq> StructuralPartialEq for MetadataField<T>