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use std::ops::{Deref, DerefMut};
use serde::ser::SerializeStruct;
use serde::{Deserialize, Serialize, Serializer};
use join::Join;
use storage::{MaskedStorage, Storage, UnprotectedStorage};
use world::{Component, Entity, Index};
#[derive(Debug)]
pub enum MergeError {
NoEntity(Index),
}
#[derive(Debug, Serialize, Deserialize)]
pub struct PackedData<T> {
pub components: Vec<T>,
pub offsets: Vec<Index>,
}
impl<T> PackedData<T> {
pub fn pair_truncate<'a>(&mut self, entities: &'a [Entity]) {
self.truncate(entities.len());
}
pub fn truncate(&mut self, length: usize) {
self.components.truncate(length);
self.offsets.truncate(length);
}
}
impl<'e, T, D> Serialize for Storage<'e, T, D>
where
T: Component + Serialize,
D: Deref<Target = MaskedStorage<T>>,
{
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
use hibitset::BitSetLike;
let (bitset, storage) = self.open();
let mut structure = serializer.serialize_struct("PackedData", 2)?;
let mut components: Vec<&T> = Vec::new();
let mut offsets: Vec<u32> = Vec::new();
for index in bitset.iter() {
offsets.push(index);
let component = unsafe { storage.get(index) };
components.push(component);
}
structure.serialize_field("offsets", &offsets)?;
structure.serialize_field("components", &components)?;
structure.end()
}
}
impl<'e, T, D> Storage<'e, T, D>
where
T: Component + Deserialize<'e>,
D: DerefMut<Target = MaskedStorage<T>>,
{
pub fn merge<'a>(
&'a mut self,
entities: &'a [Entity],
mut packed: PackedData<T>,
) -> Result<(), MergeError> {
for (component, offset) in packed.components.drain(..).zip(packed.offsets.iter()) {
match entities.get(*offset as usize) {
Some(entity) => {
self.insert(*entity, component);
}
None => {
return Err(MergeError::NoEntity(*offset));
}
}
}
Ok(())
}
}