Trait VariantBuilderExt 

pub trait VariantBuilderExt {
    type State<'a>: BuilderSpecificState + 'a
       where Self: 'a;

    // Required methods
    fn append_null(&mut self);
    fn append_value<'m, 'v>(&mut self, value: impl Into<Variant<'m, 'v>>);
    fn try_new_list(
        &mut self,
    ) -> Result<ListBuilder<'_, Self::State<'_>>, ArrowError>;
    fn try_new_object(
        &mut self,
    ) -> Result<ObjectBuilder<'_, Self::State<'_>>, ArrowError>;

    // Provided methods
    fn new_list(&mut self) -> ListBuilder<'_, Self::State<'_>> { ... }
    fn new_object(&mut self) -> ObjectBuilder<'_, Self::State<'_>> { ... }
}

Extends VariantBuilder to help building nested Variants

Allows users to append values to a VariantBuilder, ListBuilder or ObjectBuilder. using the same interface.

Required Associated Types

type State<'a>: BuilderSpecificState + 'a where Self: 'a

The builder specific state used by nested builders

Required Methods

fn append_null(&mut self)

Appends a NULL value to this builder. The semantics depend on the implementation, but will often translate to appending a Variant::Null value.

fn append_value<'m, 'v>(&mut self, value: impl Into<Variant<'m, 'v>>)

Appends a new variant value to this builder. See e.g. VariantBuilder::append_value.

fn try_new_list( &mut self, ) -> Result<ListBuilder<'_, Self::State<'_>>, ArrowError>

Creates a nested list builder. See e.g. VariantBuilder::new_list. Returns an error if the nested builder cannot be created, see e.g. ObjectBuilder::try_new_list.

fn try_new_object( &mut self, ) -> Result<ObjectBuilder<'_, Self::State<'_>>, ArrowError>

Creates a nested object builder. See e.g. VariantBuilder::new_object. Returns an error if the nested builder cannot be created, see e.g. ObjectBuilder::try_new_object.

Provided Methods

fn new_list(&mut self) -> ListBuilder<'_, Self::State<'_>>

Creates a nested list builder. See e.g. VariantBuilder::new_list. Panics if the nested builder cannot be created, see e.g. ObjectBuilder::new_list.

fn new_object(&mut self) -> ObjectBuilder<'_, Self::State<'_>>

Creates a nested object builder. See e.g. VariantBuilder::new_object. Panics if the nested builder cannot be created, see e.g. ObjectBuilder::new_object.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl VariantBuilderExt for VariantBuilder

type State<'a> = () where Self: 'a

impl<'a, S: BuilderSpecificState> VariantBuilderExt for ListBuilder<'a, S>

type State<'s> = ListState<'s> where Self: 's

impl<S: BuilderSpecificState> VariantBuilderExt for ObjectFieldBuilder<'_, '_, '_, S>

type State<'a> = ObjectState<'a> where Self: 'a