feat(ecs): add entity::ObtainerHEADmaster

2 files changed, 31 insertions, 0 deletions

diff --git a/ecs/src/entity.rs b/ecs/src/entity.rs
index 16f881d..bec50cd 100644
--- a/ecs/src/entity.rs
+++ b/ecs/src/entity.rs
@@ -15,6 +15,8 @@ use crate::component::{
 use crate::uid::{Kind as UidKind, Uid};
 use crate::{EntityComponentRef, World};
 
+pub mod obtainer;
+
 /// A handle to a entity.
 #[derive(Debug)]
 pub struct Handle<'a>
diff --git a/ecs/src/entity/obtainer.rs b/ecs/src/entity/obtainer.rs
new file mode 100644
index 0000000..6c2ea96
--- /dev/null
+++ b/ecs/src/entity/obtainer.rs
@@ -0,0 +1,29 @@
+use crate::entity::Handle as EntityHandle;
+use crate::system::{Metadata as SystemMetadata, Param as SystemParam};
+use crate::uid::Uid;
+use crate::World;
+
+#[derive(Debug)]
+pub struct Obtainer<'world>
+{
+    world: &'world World,
+}
+
+impl<'world> SystemParam<'world> for Obtainer<'world>
+{
+    type Input = ();
+
+    fn new(world: &'world World, _system_metadata: &SystemMetadata) -> Self
+    {
+        Self { world }
+    }
+}
+
+impl Obtainer<'_>
+{
+    #[must_use]
+    pub fn get_entity(&self, entity_id: Uid) -> Option<EntityHandle<'_>>
+    {
+        self.world.get_entity(entity_id)
+    }
+}