aws_sdk_ec2/types/_volume_type.rs
1// Code generated by software.amazon.smithy.rust.codegen.smithy-rs. DO NOT EDIT.
2
3/// When writing a match expression against `VolumeType`, it is important to ensure
4/// your code is forward-compatible. That is, if a match arm handles a case for a
5/// feature that is supported by the service but has not been represented as an enum
6/// variant in a current version of SDK, your code should continue to work when you
7/// upgrade SDK to a future version in which the enum does include a variant for that
8/// feature.
9///
10/// Here is an example of how you can make a match expression forward-compatible:
11///
12/// ```text
13/// # let volumetype = unimplemented!();
14/// match volumetype {
15/// VolumeType::Gp2 => { /* ... */ },
16/// VolumeType::Gp3 => { /* ... */ },
17/// VolumeType::Io1 => { /* ... */ },
18/// VolumeType::Io2 => { /* ... */ },
19/// VolumeType::Sc1 => { /* ... */ },
20/// VolumeType::St1 => { /* ... */ },
21/// VolumeType::Standard => { /* ... */ },
22/// other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
23/// _ => { /* ... */ },
24/// }
25/// ```
26/// The above code demonstrates that when `volumetype` represents
27/// `NewFeature`, the execution path will lead to the second last match arm,
28/// even though the enum does not contain a variant `VolumeType::NewFeature`
29/// in the current version of SDK. The reason is that the variable `other`,
30/// created by the `@` operator, is bound to
31/// `VolumeType::Unknown(UnknownVariantValue("NewFeature".to_owned()))`
32/// and calling `as_str` on it yields `"NewFeature"`.
33/// This match expression is forward-compatible when executed with a newer
34/// version of SDK where the variant `VolumeType::NewFeature` is defined.
35/// Specifically, when `volumetype` represents `NewFeature`,
36/// the execution path will hit the second last match arm as before by virtue of
37/// calling `as_str` on `VolumeType::NewFeature` also yielding `"NewFeature"`.
38///
39/// Explicitly matching on the `Unknown` variant should
40/// be avoided for two reasons:
41/// - The inner data `UnknownVariantValue` is opaque, and no further information can be extracted.
42/// - It might inadvertently shadow other intended match arms.
43///
44#[allow(missing_docs)] // documentation missing in model
45#[non_exhaustive]
46#[derive(
47 ::std::clone::Clone, ::std::cmp::Eq, ::std::cmp::Ord, ::std::cmp::PartialEq, ::std::cmp::PartialOrd, ::std::fmt::Debug, ::std::hash::Hash,
48)]
49pub enum VolumeType {
50 #[allow(missing_docs)] // documentation missing in model
51 Gp2,
52 #[allow(missing_docs)] // documentation missing in model
53 Gp3,
54 #[allow(missing_docs)] // documentation missing in model
55 Io1,
56 #[allow(missing_docs)] // documentation missing in model
57 Io2,
58 #[allow(missing_docs)] // documentation missing in model
59 Sc1,
60 #[allow(missing_docs)] // documentation missing in model
61 St1,
62 #[allow(missing_docs)] // documentation missing in model
63 Standard,
64 /// `Unknown` contains new variants that have been added since this code was generated.
65 #[deprecated(note = "Don't directly match on `Unknown`. See the docs on this enum for the correct way to handle unknown variants.")]
66 Unknown(crate::primitives::sealed_enum_unknown::UnknownVariantValue),
67}
68impl ::std::convert::From<&str> for VolumeType {
69 fn from(s: &str) -> Self {
70 match s {
71 "gp2" => VolumeType::Gp2,
72 "gp3" => VolumeType::Gp3,
73 "io1" => VolumeType::Io1,
74 "io2" => VolumeType::Io2,
75 "sc1" => VolumeType::Sc1,
76 "st1" => VolumeType::St1,
77 "standard" => VolumeType::Standard,
78 other => VolumeType::Unknown(crate::primitives::sealed_enum_unknown::UnknownVariantValue(other.to_owned())),
79 }
80 }
81}
82impl ::std::str::FromStr for VolumeType {
83 type Err = ::std::convert::Infallible;
84
85 fn from_str(s: &str) -> ::std::result::Result<Self, <Self as ::std::str::FromStr>::Err> {
86 ::std::result::Result::Ok(VolumeType::from(s))
87 }
88}
89impl VolumeType {
90 /// Returns the `&str` value of the enum member.
91 pub fn as_str(&self) -> &str {
92 match self {
93 VolumeType::Gp2 => "gp2",
94 VolumeType::Gp3 => "gp3",
95 VolumeType::Io1 => "io1",
96 VolumeType::Io2 => "io2",
97 VolumeType::Sc1 => "sc1",
98 VolumeType::St1 => "st1",
99 VolumeType::Standard => "standard",
100 VolumeType::Unknown(value) => value.as_str(),
101 }
102 }
103 /// Returns all the `&str` representations of the enum members.
104 pub const fn values() -> &'static [&'static str] {
105 &["gp2", "gp3", "io1", "io2", "sc1", "st1", "standard"]
106 }
107}
108impl ::std::convert::AsRef<str> for VolumeType {
109 fn as_ref(&self) -> &str {
110 self.as_str()
111 }
112}
113impl VolumeType {
114 /// Parses the enum value while disallowing unknown variants.
115 ///
116 /// Unknown variants will result in an error.
117 pub fn try_parse(value: &str) -> ::std::result::Result<Self, crate::error::UnknownVariantError> {
118 match Self::from(value) {
119 #[allow(deprecated)]
120 Self::Unknown(_) => ::std::result::Result::Err(crate::error::UnknownVariantError::new(value)),
121 known => Ok(known),
122 }
123 }
124}
125impl ::std::fmt::Display for VolumeType {
126 fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
127 match self {
128 VolumeType::Gp2 => write!(f, "gp2"),
129 VolumeType::Gp3 => write!(f, "gp3"),
130 VolumeType::Io1 => write!(f, "io1"),
131 VolumeType::Io2 => write!(f, "io2"),
132 VolumeType::Sc1 => write!(f, "sc1"),
133 VolumeType::St1 => write!(f, "st1"),
134 VolumeType::Standard => write!(f, "standard"),
135 VolumeType::Unknown(value) => write!(f, "{value}"),
136 }
137 }
138}