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use std::any::{type_name, Any};
use std::marker::PhantomData;
use std::sync::{Arc, Weak};
use crate::component::storage::Storage as ComponentStorage;
use crate::component::{
is_optional as component_is_optional,
Component,
FromOptional as ComponentFromOptional,
Id as ComponentId,
Metadata as ComponentMetadata,
};
use crate::entity::Uid as EntityUid;
use crate::lock::{Lock, ReadGuard};
use crate::system::{ComponentRefMut, Input as SystemInput};
use crate::type_name::TypeName;
use crate::World;
#[derive(Debug)]
pub struct Relationship<Kind, ComponentT: Component>
{
entity_uid: EntityUid,
component_storage: Weak<Lock<ComponentStorage>>,
_pd: PhantomData<(Kind, ComponentT)>,
}
impl<Kind, ComponentT> Relationship<Kind, ComponentT>
where
ComponentT: Component,
{
pub fn new(world: &World, entity_uid: EntityUid) -> Self
{
Self {
entity_uid,
component_storage: Arc::downgrade(&world.data.component_storage),
_pd: PhantomData,
}
}
}
impl<Kind, ComponentT> Component for Relationship<Kind, ComponentT>
where
Kind: 'static,
ComponentT: Component,
{
type Component = Self;
type RefMut<'component> = Relation<'component, Kind, ComponentT>;
fn id(&self) -> ComponentId
{
ComponentId::of::<Self>()
}
fn as_any_mut(&mut self) -> &mut dyn Any
{
self
}
fn as_any(&self) -> &dyn Any
{
self
}
}
impl<Kind, ComponentT> SystemInput for Relationship<Kind, ComponentT>
where
Kind: 'static,
ComponentT: Component,
{
}
impl<Kind, ComponentT: Component> TypeName for Relationship<Kind, ComponentT>
where
ComponentT: Component,
{
fn type_name(&self) -> &'static str
{
type_name::<Self>()
}
}
pub struct Relation<'rel_comp, Kind, ComponentT>
where
Kind: 'static,
ComponentT: Component,
{
component_storage_lock: ReadGuard<'static, ComponentStorage>,
relationship_comp: ComponentRefMut<'rel_comp, Relationship<Kind, ComponentT>>,
_component_storage: Arc<Lock<ComponentStorage>>,
}
impl<'rel_comp, Kind, ComponentT> ComponentFromOptional<'rel_comp>
for Relation<'rel_comp, Kind, ComponentT>
where
ComponentT: Component,
{
fn from_optional_component(
optional_component: Option<
crate::lock::WriteGuard<'rel_comp, Box<dyn Component>>,
>,
) -> Self
{
let relationship_comp =
ComponentRefMut::<Relationship<Kind, ComponentT>>::from_optional_component(
optional_component,
);
let component_storage = relationship_comp
.component_storage
.upgrade()
.expect("World has been dropped");
let component_storage_lock = component_storage
.read_nonblock()
.expect("Failed to aquire read-only component storage lock");
Self {
relationship_comp,
// SAFETY: The component lock is not used for longer than the original
// lifetime
component_storage_lock: unsafe { component_storage_lock.upgrade_lifetime() },
_component_storage: component_storage,
}
}
}
impl<'rel_comp, Kind, ComponentT> Relation<'rel_comp, Kind, ComponentT>
where
ComponentT: Component,
{
/// Retrieves the related-to component.
pub fn get(&self) -> Option<ComponentRefMut<'_, ComponentT>>
{
let mut archetype_iter =
self.component_storage_lock
.find_entities([ComponentMetadata {
id: ComponentId::of::<ComponentT>(),
is_optional: component_is_optional::<ComponentT>().into(),
}]);
let (entity, archetype) = archetype_iter.find_map(|archetype| {
let Some(entity) = archetype.get_entity(self.relationship_comp.entity_uid)
else {
return None;
};
Some((entity, archetype))
})?;
let component_index =
archetype.get_index_for_component(&ComponentId::of::<ComponentT>())?;
let component = ComponentRefMut::new(
entity
.get_component(component_index)?
.component
.write_nonblock()
.unwrap_or_else(|_| {
panic!(
"Failed to aquire read-write lock of component {}",
type_name::<ComponentT>()
)
}),
);
Some(component)
}
}
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