1 files changed, 55 insertions, 0 deletions
diff --git a/src/di_container/blocking/binding/when_configurator.rs b/src/di_container/blocking/binding/when_configurator.rs
new file mode 100644
index 0000000..9cd9bb6
--- /dev/null
+++ b/src/di_container/blocking/binding/when_configurator.rs
@@ -0,0 +1,55 @@
+//! 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::blocking::DIContainer;
+use crate::errors::di_container::BindingWhenConfiguratorError;
+
+/// 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 mut bindings_mut = self.di_container.bindings.borrow_mut();
+
+        let binding = bindings_mut.remove::<Interface>(None).map_or_else(
+            || {
+                Err(BindingWhenConfiguratorError::BindingNotFound(type_name::<
+                    Interface,
+                >(
+                )))
+            },
+            Ok,
+        )?;
+
+        bindings_mut.set::<Interface>(Some(name), binding);
+
+        Ok(())
+    }
+}