git.squeep.com Git - squeep-api-dingus/blob - lib/router/path-parameter.js

   1 'use strict';
   2
   3 const parameters = new Map();
   4 /**
   5  * De-duplicating factory of minimal-objects to track the named-parameter parts of path definitions.
   6  *
   7  * @property {String} parameter
   8  */
   9 class PathParameter extends null {
  10   static #parameters = parameters;
  11
  12   constructor(parameter) {
  13     if (!parameter || typeof(parameter) !== 'string') {
  14       throw new RangeError('parameter must be string');
  15     }
  16
  17     if (PathParameter.#parameters.has(parameter)) {
  18       return PathParameter.#parameters.get(parameter); // NOSONAR
  19     }
  20
  21     const pathParameter = Object.create(PathParameter.prototype);
  22     pathParameter.parameter = parameter;
  23     Object.freeze(pathParameter);
  24     PathParameter.#parameters.set(parameter, pathParameter);
  25     return pathParameter; // NOSONAR
  26   }
  27
  28   /**
  29    * @returns {String}
  30    */
  31   toString() {
  32     return this.parameter;
  33   }
  34
  35   /**
  36    * @returns {String}
  37    */
  38   toJSON() {
  39     return this.parameter;
  40   }
  41
  42   /**
  43    * Clear the de-duplication table, for tests.
  44    */
  45   static _flush() {
  46     PathParameter.#parameters.clear();
  47   }
  48 }
  49
  50 module.exports = PathParameter;