Enum gix_ref::transaction::Change

pub enum Change {
    Update {
        log: LogChange,
        expected: PreviousValue,
        new: Target,
    },
    Delete {
        expected: PreviousValue,
        log: RefLog,
    },
}

A description of an edit to perform.

Variants

Update

Fields

log: LogChange

The desired change to the reference log.

expected: PreviousValue

The expected value already present in the reference. If a ref was existing previously this field will be overwritten with MustExistAndMatch(actual_value) for use after the transaction was committed successfully.

new: Target

The new state of the reference, either for updating an existing one or creating a new one.

If previous is not None, the ref must exist and its oid must agree with the previous, and we function like update. Otherwise it functions as create-or-update.

Delete

Fields

expected: PreviousValue

The expected value of the reference, with the MustNotExist variant being invalid.

If a previous ref existed, this value will be filled in automatically as MustExistAndMatch(actual_value) and can be accessed if the transaction was committed successfully.

log: RefLog

How to treat the reference log during deletion.

Delete a reference and optionally check if previous is its content.

Implementations

impl Change

pub fn new_value(&self) -> Option<TargetRef<'_>>

Return references to values that are the new value after the change is applied, if this is an update.

pub fn previous_value(&self) -> Option<TargetRef<'_>>

Return references to values that are in common between all variants and denote the previous observed value.

Trait Implementations

impl Clone for Change

fn clone(&self) -> Change

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Change

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

Formats the value using the given formatter.

impl Hash for Change

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 Change

fn cmp(&self, other: &Change) -> 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 + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for Change

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Change

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

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

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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl Eq for Change

impl StructuralEq for Change

impl StructuralPartialEq for Change