Enum aws_sdk_iotthingsgraph::types::EntityType
source · #[non_exhaustive]pub enum EntityType {
Action,
Capability,
Device,
DeviceModel,
Enum,
Event,
Mapping,
Property,
Service,
State,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against EntityType
, it is important to ensure
your code is forward-compatible. That is, if a match arm handles a case for a
feature that is supported by the service but has not been represented as an enum
variant in a current version of SDK, your code should continue to work when you
upgrade SDK to a future version in which the enum does include a variant for that
feature.
Here is an example of how you can make a match expression forward-compatible:
# let entitytype = unimplemented!();
match entitytype {
EntityType::Action => { /* ... */ },
EntityType::Capability => { /* ... */ },
EntityType::Device => { /* ... */ },
EntityType::DeviceModel => { /* ... */ },
EntityType::Enum => { /* ... */ },
EntityType::Event => { /* ... */ },
EntityType::Mapping => { /* ... */ },
EntityType::Property => { /* ... */ },
EntityType::Service => { /* ... */ },
EntityType::State => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when entitytype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant EntityType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
EntityType::Unknown(UnknownVariantValue("NewFeature".to_owned()))
and calling as_str
on it yields "NewFeature"
.
This match expression is forward-compatible when executed with a newer
version of SDK where the variant EntityType::NewFeature
is defined.
Specifically, when entitytype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on EntityType::NewFeature
also yielding "NewFeature"
.
Explicitly matching on the Unknown
variant should
be avoided for two reasons:
- The inner data
UnknownVariantValue
is opaque, and no further information can be extracted. - It might inadvertently shadow other intended match arms.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Action
Capability
Device
DeviceModel
Enum
Event
Mapping
Property
Service
State
Unknown(UnknownVariantValue)
Unknown
. See the docs on this enum for the correct way to handle unknown variants.Unknown
contains new variants that have been added since this code was generated.
Implementations§
source§impl EntityType
impl EntityType
source§impl EntityType
impl EntityType
sourcepub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
pub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
Parses the enum value while disallowing unknown variants.
Unknown variants will result in an error.
Trait Implementations§
source§impl AsRef<str> for EntityType
impl AsRef<str> for EntityType
source§impl Clone for EntityType
impl Clone for EntityType
source§fn clone(&self) -> EntityType
fn clone(&self) -> EntityType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for EntityType
impl Debug for EntityType
source§impl Display for EntityType
impl Display for EntityType
source§impl From<&str> for EntityType
impl From<&str> for EntityType
source§impl FromStr for EntityType
impl FromStr for EntityType
source§impl Hash for EntityType
impl Hash for EntityType
source§impl Ord for EntityType
impl Ord for EntityType
source§fn cmp(&self, other: &EntityType) -> Ordering
fn cmp(&self, other: &EntityType) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq for EntityType
impl PartialEq for EntityType
source§fn eq(&self, other: &EntityType) -> bool
fn eq(&self, other: &EntityType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for EntityType
impl PartialOrd for EntityType
source§fn partial_cmp(&self, other: &EntityType) -> Option<Ordering>
fn partial_cmp(&self, other: &EntityType) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl Eq for EntityType
impl StructuralPartialEq for EntityType
Auto Trait Implementations§
impl Freeze for EntityType
impl RefUnwindSafe for EntityType
impl Send for EntityType
impl Sync for EntityType
impl Unpin for EntityType
impl UnwindSafe for EntityType
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read more