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//! When configurator for a binding for types inside of a [`DIContainer`].
use std::any::type_name;
use std::marker::PhantomData;
use std::rc::Rc;
use crate::di_container::BindingOptions;
use crate::errors::di_container::BindingWhenConfiguratorError;
use crate::util::use_double;
use_double!(crate::di_container::blocking::DIContainer);
/// When configurator for a binding for type `Interface` inside a [`DIContainer`].
pub struct BindingWhenConfigurator<Interface>
where
Interface: 'static + ?Sized,
{
di_container: Rc<DIContainer>,
interface_phantom: PhantomData<Interface>,
}
impl<Interface> BindingWhenConfigurator<Interface>
where
Interface: 'static + ?Sized,
{
pub(crate) fn new(di_container: Rc<DIContainer>) -> Self
{
Self {
di_container,
interface_phantom: PhantomData,
}
}
/// Configures the binding to have a name.
///
/// # Errors
/// Will return Err if no binding for the interface already exists.
pub fn when_named(
self,
name: &'static str,
) -> Result<(), BindingWhenConfiguratorError>
{
let binding = self
.di_container
.remove_binding::<Interface>(BindingOptions::new())
.map_or_else(
|| {
Err(BindingWhenConfiguratorError::BindingNotFound(type_name::<
Interface,
>(
)))
},
Ok,
)?;
self.di_container
.set_binding::<Interface>(BindingOptions::new().name(name), binding);
Ok(())
}
}
#[cfg(test)]
mod tests
{
use mockall::predicate::eq;
use super::*;
use crate::di_container::blocking::MockDIContainer;
use crate::provider::blocking::MockIProvider;
use crate::test_utils::subjects;
#[test]
fn when_named_works()
{
let mut di_container_mock = MockDIContainer::new();
di_container_mock
.expect_remove_binding::<dyn subjects::INumber>()
.with(eq(BindingOptions::new()))
.return_once(|_name| Some(Box::new(MockIProvider::new())))
.once();
di_container_mock
.expect_set_binding::<dyn subjects::INumber>()
.withf(|options, _provider| options.name == Some("cool"))
.return_once(|_name, _provider| ())
.once();
let binding_when_configurator =
BindingWhenConfigurator::<dyn subjects::INumber>::new(Rc::new(
di_container_mock,
));
assert!(binding_when_configurator.when_named("cool").is_ok());
}
}
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