Struct MetadataBuilder

struct MetadataBuilder {
    field_names: IndexSet<String>,
    is_sorted: bool,
    metadata_buffer: Vec<u8>,
}

Builder for constructing metadata for Variant values.

This is used internally by the VariantBuilder to construct the metadata

You can use an existing Vec<u8> as the metadata buffer by using the from impl.

Fields

field_names: IndexSet<String>

is_sorted: bool

metadata_buffer: Vec<u8>

Output buffer. Metadata is written to the end of this buffer

Implementations

impl MetadataBuilder

fn upsert_field_name(&mut self, field_name: &str) -> u32

Upsert field name to dictionary, return its ID

fn num_field_names(&self) -> usize

Returns the number of field names stored in the metadata builder. Note: this method should be the only place to call self.field_names.len()

Panics

If the number of field names exceeds the maximum allowed value for u32.

fn field_name(&self, i: usize) -> &str

fn metadata_size(&self) -> usize

fn finish(self) -> Vec<u8>

Trait Implementations

impl Debug for MetadataBuilder

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

Formats the value using the given formatter.

impl Default for MetadataBuilder

fn default() -> MetadataBuilder

Returns the “default value” for a type.

impl<S: AsRef<str>> Extend<S> for MetadataBuilder

fn extend<T: IntoIterator<Item = S>>(&mut self, iter: T)

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, item: A)

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

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

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

Reserves capacity in a collection for the given number of additional elements.

impl From<Vec<u8>> for MetadataBuilder

Create a new MetadataBuilder that will write to the specified metadata buffer

fn from(metadata_buffer: Vec<u8>) -> Self

Converts to this type from the input type.

impl<S: AsRef<str>> FromIterator<S> for MetadataBuilder

fn from_iter<T: IntoIterator<Item = S>>(iter: T) -> Self

Creates a value from an iterator.