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//! Relations between resources, resource sets, and uppers
use crate::{attr::Attr, attr::Id, meta::Meta};
/// Relations owned by a resource.
pub trait Res: Meta {
/// Resource upper.
fn upper(&self) -> &impl Attr;
/// Whether the resource belongs to the resource set.
fn belongs(&self, res_set: &impl ResSet<Self>) -> bool
where
Self: Sized,
{
let id = self.id();
res_set.iter().any(|r| r.id() == id)
}
}
/// Relations owned by a resource set.
pub trait ResSet<R: Res>: Res {
/// The &resource that the resource set contains.
fn res<'a>(&'a self) -> impl IntoIterator<Item = &'a R>
where
R: 'a;
/// The &mut resource that the resource set contains.
fn res_mut<'a>(&'a mut self) -> impl IntoIterator<Item = &'a mut R>
where
R: 'a;
/// Push a resource to the set.
fn push(&mut self, resource: R);
/// Remove a resource from the set.
fn remove(&mut self, id: Id);
/// The &resource that the resource set contains.
fn iter<'a>(&'a self) -> impl Iterator<Item = &'a R>
where
R: 'a,
{
self.res().into_iter()
}
/// The &mut resource that the resource set contains.
fn iter_mut<'a>(&'a mut self) -> impl Iterator<Item = &'a mut R>
where
R: 'a,
{
self.res_mut().into_iter()
}
/// Whether the set contains the resource.
fn contains(&self, resource: &R) -> bool {
let id = resource.id();
self.iter().any(|r| r.id() == id)
}
}
/// Relations owned by a resource sets.
pub trait ResSets<S, R>
where
S: ResSet<R>,
R: Res,
{
/// The &set that the resource sets contains.
fn sets<'a>(&'a self) -> impl IntoIterator<Item = &'a S>
where
S: 'a;
/// The &mut set that the resource sets contains.
fn sets_mut<'a>(&'a mut self) -> impl IntoIterator<Item = &'a mut S>
where
S: 'a;
/// The &set that the resource sets contains.
fn iter<'a>(&'a self) -> impl Iterator<Item = &'a S>
where
S: 'a,
{
self.sets().into_iter()
}
/// The &mut set that the resource sets contains.
fn iter_mut<'a>(&'a mut self) -> impl Iterator<Item = &'a mut S>
where
S: 'a,
{
self.sets_mut().into_iter()
}
/// Whether the sets contains the resource set.
fn contains(&self, set: &S) -> bool {
let id = set.id();
self.iter().any(|r| r.id() == id)
}
}