Trait iceberg::spec::SchemaVisitor

pub trait SchemaVisitor {
    type T;

    // Required methods
    fn schema(&mut self, schema: &Schema, value: Self::T) -> Result<Self::T>;
    fn field(
        &mut self,
        field: &NestedFieldRef,
        value: Self::T,
    ) -> Result<Self::T>;
    fn struct(
        &mut self,
        struct: &StructType,
        results: Vec<Self::T>,
    ) -> Result<Self::T>;
    fn list(&mut self, list: &ListType, value: Self::T) -> Result<Self::T>;
    fn map(
        &mut self,
        map: &MapType,
        key_value: Self::T,
        value: Self::T,
    ) -> Result<Self::T>;
    fn primitive(&mut self, p: &PrimitiveType) -> Result<Self::T>;

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

A post order schema visitor.

For order of methods called, please refer to visit_schema.

Required Associated Types

type T

Return type of this visitor.

Required Methods

fn schema(&mut self, schema: &Schema, value: Self::T) -> Result<Self::T>

Called after schema’s type visited.

fn field(&mut self, field: &NestedFieldRef, value: Self::T) -> Result<Self::T>

Called after struct’s field type visited.

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

Called after struct’s fields visited.

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

Called after list fields visited.

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

Called after map’s key and value fields visited.

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

Called when see a primitive type.

Provided Methods

fn before_struct_field(&mut self, _field: &NestedFieldRef) -> Result<()>

Called before struct field.

fn after_struct_field(&mut self, _field: &NestedFieldRef) -> Result<()>

Called after struct field.

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

Called before list field.

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

Called after list field.

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

Called before map key field.

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

Called after map key field.

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

Called before map value field.

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

Called after map value field.

Implementors