Trait ArrowSchemaVisitor

pub trait ArrowSchemaVisitor {
    type T;
    type U;

    // Required methods
    fn schema(
        &mut self,
        schema: &ArrowSchema,
        values: Vec<Self::T>,
    ) -> Result<Self::U>;
    fn struct(
        &mut self,
        fields: &Fields,
        results: Vec<Self::T>,
    ) -> Result<Self::T>;
    fn list(&mut self, list: &DataType, value: Self::T) -> Result<Self::T>;
    fn map(
        &mut self,
        map: &DataType,
        key_value: Self::T,
        value: Self::T,
    ) -> Result<Self::T>;
    fn primitive(&mut self, p: &DataType) -> Result<Self::T>;

    // Provided methods
    fn before_field(&mut self, _field: &Field) -> Result<()> { ... }
    fn after_field(&mut self, _field: &Field) -> Result<()> { ... }
    fn before_list_element(&mut self, _field: &Field) -> Result<()> { ... }
    fn after_list_element(&mut self, _field: &Field) -> Result<()> { ... }
    fn before_map_key(&mut self, _field: &Field) -> Result<()> { ... }
    fn after_map_key(&mut self, _field: &Field) -> Result<()> { ... }
    fn before_map_value(&mut self, _field: &Field) -> Result<()> { ... }
    fn after_map_value(&mut self, _field: &Field) -> Result<()> { ... }
}

A post order arrow schema visitor.

For order of methods called, please refer to [visit_schema].

Required Associated Types

type T

Return type of this visitor on arrow field.

type U

Return type of this visitor on arrow schema.

Required Methods

fn schema( &mut self, schema: &ArrowSchema, values: Vec<Self::T>, ) -> Result<Self::U>

Called after schema’s type visited.

fn struct(&mut self, fields: &Fields, results: Vec<Self::T>) -> Result<Self::T>

Called after struct’s fields visited.

fn list(&mut self, list: &DataType, value: Self::T) -> Result<Self::T>

Called after list fields visited.

fn map( &mut self, map: &DataType, key_value: Self::T, value: Self::T, ) -> Result<Self::T>

Called after map’s key and value fields visited.

fn primitive(&mut self, p: &DataType) -> Result<Self::T>

Called when see a primitive type.

Provided Methods

fn before_field(&mut self, _field: &Field) -> Result<()>

Called before struct/list/map field.

fn after_field(&mut self, _field: &Field) -> Result<()>

Called after struct/list/map field.

fn before_list_element(&mut self, _field: &Field) -> Result<()>

Called before list element.

fn after_list_element(&mut self, _field: &Field) -> Result<()>

Called after list element.

fn before_map_key(&mut self, _field: &Field) -> Result<()>

Called before map key.

fn after_map_key(&mut self, _field: &Field) -> Result<()>

Called after map key.

fn before_map_value(&mut self, _field: &Field) -> Result<()>

Called before map value.

fn after_map_value(&mut self, _field: &Field) -> Result<()>

Called after map value.

Implementors