Struct ErnBuilder 

pub struct ErnBuilder<State> { /* private fields */ }

A type-safe builder for constructing ERN instances.

ErnBuilder uses a state-driven approach to ensure that ERN components are added in the correct order and with proper validation. The generic State parameter tracks which component should be added next, providing compile-time guarantees that ERNs are constructed correctly.

Example

let ern = ErnBuilder::new()
    .with::<Domain>("my-app")?
    .with::<Category>("users")?
    .with::<Account>("tenant123")?
    .with::<EntityRoot>("profile")?
    .with::<Part>("settings")?
    .build()?;

Implementations

impl ErnBuilder<()>

Implementation of ErnBuilder for the initial state.

pub fn new() -> ErnBuilder<Domain>

Creates a new ERN builder to start the construction process.

This is always the first step when creating an ERN.

Example

let builder = ErnBuilder::new();

impl ErnBuilder<Part>

Implementation for the Part state, allowing finalization of the ERN.

pub fn build(self) -> Result<Ern, ErnError>

Finalizes the building process and constructs the ERN.

This method is available after at least one Part has been added.

Returns

• Ok(Ern) - The fully constructed ERN
• Err(ErnError) - If any validation fails

impl ErnBuilder<Parts>

Implementation for the Parts state, allowing finalization of the ERN.

pub fn build(self) -> Result<Ern, ErnError>

Finalizes the building process and constructs the ERN.

This method is available after multiple Parts have been added.

Returns

• Ok(Ern) - The fully constructed ERN
• Err(ErnError) - If any validation fails

impl<Component: ErnComponent + Hash + Clone + PartialEq + Eq> ErnBuilder<Component>

Generic implementation for all component states.

pub fn with<N>( self, part: impl Into<String>, ) -> Result<ErnBuilder<N::NextState>, ErnError>

where N: ErnComponent<NextState = Component::NextState> + Hash,

Adds the next component to the ERN, transitioning to the appropriate state.

The type parameter N determines which component is being added and ensures components are added in the correct order.

Arguments

• part - The string value for this component

Returns

• Ok(ErnBuilder<NextState>) - The builder in its next state
• Err(ErnError) - If the component value is invalid