khora_data/ecs/entity.rs
1// Copyright 2025 eraflo
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15use std::collections::HashMap;
16
17use bincode::{Decode, Encode};
18
19use crate::ecs::{page::PageIndex, SemanticDomain};
20
21/// Represents the central record for an entity, acting as a "table of contents"
22/// that points to the physical location of its component data across various `ComponentPage`s.
23#[derive(Debug, Clone, Default, Encode, Decode)]
24pub struct EntityMetadata {
25 /// A map from a semantic domain to the location of the component data for that domain.
26 /// This allows an entity to have component data in multiple different pages,
27 /// each specialized for a specific domain (e.g., Spatial, Render).
28 pub(crate) locations: HashMap<SemanticDomain, PageIndex>,
29}