text: // MIT License
  
  // Copyright (c) 2017 David Betz
  
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  
  // The above copyright notice and this permission notice shall be included in all
  // copies or substantial portions of the Software.
  
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  // SOFTWARE.
  
  const u = require('./utility')
  
  const IProvider = require('./provider')
  
  module.exports = class AbstractFactory {
      constructor() {
          this.factories = {}
      }
  
      set(factory) {
          const instance = new factory()
  
          if (typeof instance.interface_type === 'undefined') {
              throw new Error('Factory requires provider/interface type')
          }
  
          this.factories[instance.interface_type] = factory
      }
  
      remove(factory) {
          delete this.factories[new factory().interface_type]
      }
  
      resolve(provider) {
          const args = Object.keys(arguments).map(p => arguments[p]).slice(1)
          const interface_type = new provider().constructor.name
  
          const factory = this.factories[interface_type]
          if (typeof factory === 'undefined') {
              throw new Error('Factory not registered')
          }
  
          return new factory().create(...args)
      }
  }