/*:nodoc:*
   * class ActionStoreConstant
   *
   * This action stores the value specified by the const keyword argument.
   * (Note that the const keyword argument defaults to the rather unhelpful null.)
   * The 'store_const' action is most commonly used with optional
   * arguments that specify some sort of flag.
   *
   * This class inherited from [[Action]]
   **/
  'use strict';
  
  var util = require('util');
  
  var Action = require('../../action');
  
  /*:nodoc:*
   * new ActionStoreConstant(options)
   * - options (object): options hash see [[Action.new]]
   *
   **/
  var ActionStoreConstant = module.exports = function ActionStoreConstant(options) {
    options = options || {};
    options.nargs = 0;
    if (typeof options.constant === 'undefined') {
      throw new Error('constant option is required for storeAction');
    }
    Action.call(this, options);
  };
  util.inherits(ActionStoreConstant, Action);
  
  /*:nodoc:*
   * ActionStoreConstant#call(parser, namespace, values, optionString) -> Void
   * - parser (ArgumentParser): current parser
   * - namespace (Namespace): namespace for output data
   * - values (Array): parsed values
   * - optionString (Array): input option string(not parsed)
   *
   * Call the action. Save result in namespace object
   **/
  ActionStoreConstant.prototype.call = function (parser, namespace) {
    namespace.set(this.dest, this.constant);
  };