From 61ad7ba9ea51ed9a9fbcaf19a918b9149f29f74e Mon Sep 17 00:00:00 2001
From: Hanno Braun <hanno@braun-odw.eu>
Date: Thu, 15 Feb 2024 12:43:38 +0100
Subject: [PATCH] Add `TakeErrors`

---
 crates/fj-core/src/layers/validation.rs | 32 +++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/crates/fj-core/src/layers/validation.rs b/crates/fj-core/src/layers/validation.rs
index c43fca8a5..3205ad30d 100644
--- a/crates/fj-core/src/layers/validation.rs
+++ b/crates/fj-core/src/layers/validation.rs
@@ -39,6 +39,38 @@ impl Command<Validation> for InsertObject {
     }
 }
 
+/// Take all errors stored in the validation layer
+///
+/// Serves both as a command for and event produced by `Layer<Validation>`.
+pub struct TakeErrors;
+
+impl Command<Validation> for TakeErrors {
+    type Result = Result<(), ValidationErrors>;
+    type Event = Self;
+
+    fn decide(
+        self,
+        state: &Validation,
+        events: &mut Vec<Self::Event>,
+    ) -> Self::Result {
+        let errors = ValidationErrors(state.errors.values().cloned().collect());
+
+        events.push(self);
+
+        if errors.0.is_empty() {
+            Ok(())
+        } else {
+            Err(errors)
+        }
+    }
+}
+
+impl Event<Validation> for TakeErrors {
+    fn evolve(&self, state: &mut Validation) {
+        state.errors.clear();
+    }
+}
+
 /// Validation of an object failed
 ///
 /// Event produced by `Layer<Validation>`.