/*************************************************************
 *
 *  Copyright (c) 2015-2016 The MathJax Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

/**
 * @file Generic class for keeping track of menu variables.
 * @author volker.sorge@gmail.com (Volker Sorge)
 */

import { Variable } from './variable.js';

export class VariablePool<T> {
  private pool: { [name: string]: Variable<T> } = {};

  /**
   * Inserts a new variable into the pool.
   * @param variable The new variable.
   */
  public insert(variable: Variable<T>) {
    this.pool[variable.name] = variable;
  }

  /**
   * Lookup a variable in the pool. Returns undefined if the variable does not
   * exist.
   * @param name The name of the variable.
   * @returns The variable if it is in the pool.
   */
  public lookup(name: string) {
    return this.pool[name];
  }

  /**
   * Removes the variable from the pool.
   * @param name The name of the variable.
   */
  public remove(name: string) {
    delete this.pool[name];
  }

  /**
   * Executes update method for all variables in the pool.
   */
  public update() {
    for (const variable in this.pool) {
      this.pool[variable].update();
    }
  }
}
