HookMap.js
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	/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
	*/
	"use strict";

	const util = require("util");

	const defaultFactory = (key, hook) => hook;

	class HookMap {
	constructor(factory, name = undefined) {
	this._map = new Map();
	this.name = name;
	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: defaultFactory
	},
	interceptor
	)
	);
	}
	}

	HookMap.prototype.tap = util.deprecate(function(key, options, fn) {
	return this.for(key).tap(options, fn);
	}, "HookMap#tap(key,…) is deprecated. Use HookMap#for(key).tap(…) instead.");

	HookMap.prototype.tapAsync = util.deprecate(function(key, options, fn) {
	return this.for(key).tapAsync(options, fn);
	}, "HookMap#tapAsync(key,…) is deprecated. Use HookMap#for(key).tapAsync(…) instead.");

	HookMap.prototype.tapPromise = util.deprecate(function(key, options, fn) {
	return this.for(key).tapPromise(options, fn);
	}, "HookMap#tapPromise(key,…) is deprecated. Use HookMap#for(key).tapPromise(…) instead.");

	module.exports = HookMap;