Enum Cause 

pub enum Cause {
    Local(String),
    Qualified {
        store: StoreId,
        hash: String,
    },
}

A reference to a causal ancestor.

Variants

Local(String)

A hash with no store qualification: every node written before this format existed, plus every ordinary intra-store edge written after it. Resolves against the store doing the reading.

Qualified

Explicitly qualified — the hash lives in store, not in whichever store happens to be reading.

Fields

store: StoreId

hash: String

Implementations

impl Cause

pub fn local(hash: impl Into<String>) -> Result<Self, CauseParseError>

Build a local (unqualified) cause, validating the hash.

pub fn qualified( store: StoreId, hash: impl Into<String>, ) -> Result<Self, CauseParseError>

Build a qualified cause, validating the hash. The store id is already validated by virtue of being a StoreId.

pub fn hash(&self) -> &str

The object hash, regardless of variant.

pub fn store(&self) -> Option<&StoreId>

The store id, or None for a local cause.

pub fn is_qualified(&self) -> bool

True if this reference names a store explicitly.

pub fn render(&self) -> String

Render to the wire form. Same as render.

Trait Implementations

impl Clone for Cause

fn clone(&self) -> Cause

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Cause

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Cause

fn deserialize<D: Deserializer<'de>>(d: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

impl Display for Cause

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

Formats the value using the given formatter.

impl Eq for Cause

impl From<Cause> for String

fn from(c: Cause) -> String

Converts to this type from the input type.

impl FromStr for Cause

type Err = CauseParseError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Hash for Cause

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Cause

fn cmp(&self, other: &Cause) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for Cause

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Cause

fn partial_cmp(&self, other: &Cause) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for Cause

fn serialize<S: Serializer>(&self, s: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Cause

impl TryFrom<String> for Cause

type Error = CauseParseError

The type returned in the event of a conversion error.

fn try_from(s: String) -> Result<Self, Self::Error>

Performs the conversion.