Initial commit

src/managers/DataManager.js

@@ -0,0 +1,61 @@
+'use strict';
+
+const BaseManager = require('./BaseManager');
+const { Error } = require('../errors');
+
+/**
+ * Manages the API methods of a data model along with a collection of instances.
+ * @extends {BaseManager}
+ * @abstract
+ */
+class DataManager extends BaseManager {
+  constructor(client, holds) {
+    super(client);
+
+    /**
+     * The data structure belonging to this manager.
+     * @name DataManager#holds
+     * @type {Function}
+     * @private
+     * @readonly
+     */
+    Object.defineProperty(this, 'holds', { value: holds });
+  }
+
+  /**
+   * The cache of items for this manager.
+   * @type {Collection}
+   * @abstract
+   */
+  get cache() {
+    throw new Error('NOT_IMPLEMENTED', 'get cache', this.constructor.name);
+  }
+
+  /**
+   * Resolves a data entry to a data Object.
+   * @param {string|Object} idOrInstance The id or instance of something in this Manager
+   * @returns {?Object} An instance from this Manager
+   */
+  resolve(idOrInstance) {
+    if (idOrInstance instanceof this.holds) return idOrInstance;
+    if (typeof idOrInstance === 'string') return this.cache.get(idOrInstance) ?? null;
+    return null;
+  }
+
+  /**
+   * Resolves a data entry to an instance id.
+   * @param {string|Object} idOrInstance The id or instance of something in this Manager
+   * @returns {?Snowflake}
+   */
+  resolveId(idOrInstance) {
+    if (idOrInstance instanceof this.holds) return idOrInstance.id;
+    if (typeof idOrInstance === 'string') return idOrInstance;
+    return null;
+  }
+
+  valueOf() {
+    return this.cache;
+  }
+}
+
+module.exports = DataManager;