text: /*
  	MIT License http://www.opensource.org/licenses/mit-license.php
  	Author Tobias Koppers @sokra
  */
  "use strict";
  
  class HookMap {
  	constructor(factory) {
  		this._map = new Map();
  		this._factory = factory;
  		this._interceptors = [];
  	}
  
  	get(key) {
  		return this._map.get(key);
  	}
  
  	for(key) {
  		const hook = this.get(key);
  		if(hook !== undefined) {
  			return hook;
  		}
  		let newHook = this._factory(key);
  		const interceptors = this._interceptors;
  		for(let i = 0; i < interceptors.length; i++) {
  			newHook = interceptors[i].factory(key, newHook);
  		}
  		this._map.set(key, newHook);
  		return newHook;
  	}
  
  	intercept(interceptor) {
  		this._interceptors.push(Object.assign({
  			factory: (key, hook) => hook
  		}, interceptor));
  	}
  
  	tap(key, options, fn) {
  		return this.for(key).tap(options, fn);
  	}
  
  	tapAsync(key, options, fn) {
  		return this.for(key).tapAsync(options, fn);
  	}
  
  	tapPromise(key, options, fn) {
  		return this.for(key).tapPromise(options, fn);
  	}
  }
  
  module.exports = HookMap;
  