/**
 * @exports
 * @class
 */
export class Reference {
  /**
   * @private
   * @description The array holding the references
   * @type {Array<object>}
   */
  private references: object[];

  /**
   * @constructor
   */
  constructor() {
    /**
     * @description Initialize the reference holder
     * @type {Array<object>}
     */
    this.references = []
  }

  /**
   * @public
   * @description Returns a referenced value by index
   * @param {number} idx
   * @returns {object}
   */
  public get(idx: number): object {
    return this.references[idx];
  }

  /**
   * @public
   * @description Checks whether the given value is referenceable and returns it's index or adds it
   * @param {object} value
   * @returns {number|boolean}
   */
  public check(value: object): number | boolean {
    const idx: number = this.references.indexOf(value);

    if (idx > -1) {
      return idx;
    } else {
      this.add(value);

      return false;
    }
  }

  /**
   * @public
   * @description Adds a new referenceable value
   * @param {object} value
   * @returns {void}
   */
  public add(value: object): void {
    this.references[this.references.length] = value;
  }
}