Struct hdk::prelude::chain::ChainFilter
[−]pub struct ChainFilter {
pub chain_top: HoloHash<Action>,
pub filters: ChainFilters,
}
Expand description
Filter source chain items.
Starting from some chain position given as an ActionHash
the chain is walked backwards to genesis.
The filter can stop early by specifying the number of
chain items to take and / or an ActionHash
to consume until.
Fields
chain_top: HoloHash<Action>
The starting position of the filter.
filters: ChainFilters
The filters that have been applied.
Defaults to ChainFilters::ToGenesis
.
Implementations
impl ChainFilter
impl ChainFilter
pub fn new(chain_top: HoloHash<Action>) -> ChainFilter
pub fn new(chain_top: HoloHash<Action>) -> ChainFilter
Create a new filter using this ActionHash
as
the starting position and walking the chain
towards the genesis Action
.
pub fn take(self, n: u32) -> ChainFilter
pub fn take(self, n: u32) -> ChainFilter
Take up to n
actions including the starting position.
This may return less then n
actions.
pub fn until(self, action_hash: HoloHash<Action>) -> ChainFilter
pub fn until(self, action_hash: HoloHash<Action>) -> ChainFilter
Take all actions until this action hash is found.
Note that all actions specified as until
hashes must be
found so this filter can produce deterministic results.
It is invalid to specify an until hash that is on a different
fork then the starting position.
Trait Implementations
impl Clone for ChainFilter
impl Clone for ChainFilter
fn clone(&self) -> ChainFilter
fn clone(&self) -> ChainFilter
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
impl Debug for ChainFilter
impl Debug for ChainFilter
impl<'de> Deserialize<'de> for ChainFilter
impl<'de> Deserialize<'de> for ChainFilter
fn deserialize<__D>(
__deserializer: __D
) -> Result<ChainFilter, <__D as Deserializer<'de>>::Error> where
__D: Deserializer<'de>,
fn deserialize<__D>(
__deserializer: __D
) -> Result<ChainFilter, <__D as Deserializer<'de>>::Error> where
__D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer. Read more
impl PartialEq<ChainFilter> for ChainFilter
impl PartialEq<ChainFilter> for ChainFilter
fn eq(&self, other: &ChainFilter) -> bool
fn eq(&self, other: &ChainFilter) -> bool
This method tests for self
and other
values to be equal, and is used
by ==
. Read more
fn ne(&self, other: &ChainFilter) -> bool
fn ne(&self, other: &ChainFilter) -> bool
This method tests for !=
.
impl Serialize for ChainFilter
impl Serialize for ChainFilter
fn serialize<__S>(
&self,
__serializer: __S
) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error> where
__S: Serializer,
fn serialize<__S>(
&self,
__serializer: __S
) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error> where
__S: Serializer,
Serialize this value into the given Serde serializer. Read more
impl TryFrom<&ChainFilter> for SerializedBytes
impl TryFrom<&ChainFilter> for SerializedBytes
type Error = SerializedBytesError
type Error = SerializedBytesError
The type returned in the event of a conversion error.
fn try_from(t: &ChainFilter) -> Result<SerializedBytes, SerializedBytesError>
fn try_from(t: &ChainFilter) -> Result<SerializedBytes, SerializedBytesError>
Performs the conversion.
impl TryFrom<ChainFilter> for SerializedBytes
impl TryFrom<ChainFilter> for SerializedBytes
type Error = SerializedBytesError
type Error = SerializedBytesError
The type returned in the event of a conversion error.
fn try_from(t: ChainFilter) -> Result<SerializedBytes, SerializedBytesError>
fn try_from(t: ChainFilter) -> Result<SerializedBytes, SerializedBytesError>
Performs the conversion.
impl TryFrom<SerializedBytes> for ChainFilter
impl TryFrom<SerializedBytes> for ChainFilter
type Error = SerializedBytesError
type Error = SerializedBytesError
The type returned in the event of a conversion error.
fn try_from(sb: SerializedBytes) -> Result<ChainFilter, SerializedBytesError>
fn try_from(sb: SerializedBytes) -> Result<ChainFilter, SerializedBytesError>
Performs the conversion.
impl Eq for ChainFilter
impl StructuralEq for ChainFilter
impl StructuralPartialEq for ChainFilter
Auto Trait Implementations
impl RefUnwindSafe for ChainFilter
impl Send for ChainFilter
impl Sync for ChainFilter
impl Unpin for ChainFilter
impl UnwindSafe for ChainFilter
Blanket Implementations
impl<T> ArchivePointee for T
impl<T> ArchivePointee for T
type ArchivedMetadata = ()
type ArchivedMetadata = ()
The archived version of the pointer metadata for this type.
fn pointer_metadata(
&<T as ArchivePointee>::ArchivedMetadata
) -> <T as Pointee>::Metadata
fn pointer_metadata(
&<T as ArchivePointee>::ArchivedMetadata
) -> <T as Pointee>::Metadata
Converts some archived metadata to the pointer metadata for itself.
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
impl<F, W, T, D> Deserialize<With<T, W>, D> for F where
W: DeserializeWith<F, T, D>,
D: Fallible + ?Sized,
F: ?Sized,
impl<F, W, T, D> Deserialize<With<T, W>, D> for F where
W: DeserializeWith<F, T, D>,
D: Fallible + ?Sized,
F: ?Sized,
fn deserialize(
&self,
deserializer: &mut D
) -> Result<With<T, W>, <D as Fallible>::Error>
fn deserialize(
&self,
deserializer: &mut D
) -> Result<With<T, W>, <D as Fallible>::Error>
Deserializes using the given deserializer
sourceimpl<Q, K> Equivalent<K> for Q where
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Q where
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
sourcefn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
Compare self to key
and return true
if they are equal.
sourceimpl<T> Instrument for T
impl<T> Instrument for T
sourcefn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
sourcefn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
sourceimpl<T> WithSubscriber for T
impl<T> WithSubscriber for T
sourcefn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
where
S: Into<Dispatch>,
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
where
S: Into<Dispatch>,
T: Future, type Output = <T as Future>::Output;
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
sourcefn with_current_subscriber(self) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
fn with_current_subscriber(self) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more