All files / patterns/ecs/src engine.ts

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import { uuid } from "jga-generators-uuid";
 
import { SystemInterface } from "./system";
 
import { Entity, EntityInterface } from "./entity";
 
export interface EngineInterface {
    getEntities(): Map<string, EntityInterface>;
    addEntity(entity: EntityInterface): void;
    createEntity(): EntityInterface;
    removeEntity(id: string): void;
    process(systems: SystemInterface[]): void;
}
 
export class Engine implements EngineInterface {
    protected entities: Map<string, EntityInterface>;
 
    public constructor() {
        this.entities = new Map<string, EntityInterface>();
    }
 
    public getEntities(): Map<string, EntityInterface> {
        return this.entities;
    }
 
    public createEntity(): EntityInterface {
        const entity = new Entity(this.generateId());
 
        this.addEntity(entity);
 
        return entity;
    }
 
    public addEntity(entity: EntityInterface): void {
        this.entities.set(entity.getId(), entity);
    }
 
    public removeEntity(id: string): void {
        if (this.entities.has(id)) {
            this.entities.delete(id);
        }
    }
 
    public process(systems: SystemInterface[]): void {
        systems.forEach((system): void => {
            system.run();
        });
    }
 
    protected generateId(): string {
        let id: string;
        do {
            id = uuid();
        } while (this.entities.has(id));
 
        return id;
    }
}