ValueBuilder

Struct ValueBuilder 

pub struct ValueBuilder(Vec<u8>);
Expand description

Wrapper around a Vec<u8> that provides methods for appending primitive values, variant types, and metadata.

This is used internally by the builders to construct the the value field for Variant values.

You can reuse an existing Vec<u8> by using the from impl

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§0: Vec<u8>

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impl ValueBuilder

pub fn new() -> ValueBuilder

Construct a ValueBuffer that will write to a new underlying Vec

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impl ValueBuilder

pub fn into_inner(self) -> Vec<u8>

Returns the underlying buffer, consuming self

pub fn offset(&self) -> usize

Returns the current size of the underlying buffer

pub fn append_variant<S>(state: ParentState<'_, S>, variant: Variant<'_, '_>)

Appends a variant to the builder.

§Panics

This method will panic if the variant contains duplicate field names in objects when validation is enabled. For a fallible version, use ValueBuilder::try_append_variant

pub fn try_append_variant<S>( state: ParentState<'_, S>, variant: Variant<'_, '_>, ) -> Result<(), ArrowError>

Tries to append a variant to the provided ParentState instance.

The attempt fails if the variant contains duplicate field names in objects when validation is enabled.

pub fn append_variant_bytes<S>( state: ParentState<'_, S>, variant: Variant<'_, '_>, )

Appends a variant to the buffer by copying raw bytes when possible.

For objects and lists, this directly copies their underlying byte representation instead of performing a logical copy and without touching the metadata builder. For other variant types, this falls back to the standard append behavior.

The caller must ensure that the metadata dictionary is already built and correct for any objects or lists being appended.

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impl Debug for ValueBuilder

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

Formats the value using the given formatter. Read more
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impl Default for ValueBuilder

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fn default() -> ValueBuilder

Returns the “default value” for a type. Read more

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Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts 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 more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts 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
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> Allocation for T
where T: RefUnwindSafe + Send + Sync,

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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> Ungil for T
where T: Send,