feat: LazyEntityUpdater

@sammo/game_logic/src/LazyEntityUpdater.ts

@@ -0,0 +1,31 @@
+import type { IResourceController, ValidEntity, ValidEntityType } from "./ResourceController.js";
+
+export abstract class LazyEntityUpdater<Entity extends ValidEntity>{
+    protected abstract readonly _indirectNames: (keyof Entity)[];
+    protected abstract readonly _entityType: ValidEntityType<Entity>;
+
+    protected abstract readonly _raw: Entity;
+
+    protected abstract readonly resourceController: IResourceController;
+
+    public get raw(): Readonly<Entity> {
+        return this._raw;
+    }
+
+    public get entityType(): ValidEntityType<Entity> {
+        return this._entityType;
+    }
+
+    public update(callback: (oldRaw: Entity) => void, force = false) {
+        const oldRaw = { ...this._raw };
+        callback(this._raw);
+        if (!force) {
+            for (const indirectName of this._indirectNames) {
+                if (oldRaw[indirectName] !== this._raw[indirectName]) {
+                    throw new Error(`${String(indirectName)} change by update() is not allowed`);
+                }
+            }
+        }
+        this.resourceController.setDirty(this);
+    }
+}