class-o-mat/src/class-o-mat/_event-methods-o-mat.js

ALPHA VERSION ONLY: class-o-mats will help to create getter-setter functionality with validations that can be attached to a container class for easier coding. Some basic validations are included. class-o-mats also has the ability to store params as bloc

import Bunyan from 'bunyan';
const  log = Bunyan.createLogger({name: "EventMethodsOMat"});

import { NONE } from '../constants/types';

const eventMethods = { 
  onDelete(...callbacks) { 
    // HAH! I don't exist yet!
  },

  onGet(...callbacks) { 
    const {key} = this._params;
    callbacks.forEach((callback)=>this._appendEvent(callback, key, 'ON_GET'));
    return this;
  },

  onSet(...callbacks) {
    const {key} = this._params;
    callbacks.forEach((callback)=>this._appendEvent(callback, key, 'ON_SET'));
    return this;
  },

  _appendEvent(callback, key, EVENT_KEY) { 
    const currentCallback = this._params[EVENT_KEY];
    if (currentCallback === NONE) { 
      this._params[EVENT_KEY] = callback;
    } else { 
      this._params[EVENT_KEY] 
        = (self, key, value)=>{ 
          currentCallback(self, key, value);
          callback(self, key, value);
        }
    }
  }
}

export default eventMethods;