// Call dispose callback on each cache purge

"use strict";

var callable   = require("es5-ext/object/valid-callable")
  , forEach    = require("es5-ext/object/for-each")
  , extensions = require("../lib/registered-extensions")
  , apply      = Function.prototype.apply;

extensions.dispose = function (dispose, conf, options) {
	var del;
	callable(dispose);
	if ((options.async && extensions.async) || (options.promise && extensions.promise)) {
		conf.on(
			"deleteasync",
			(del = function (id, resultArray) { apply.call(dispose, null, resultArray); })
		);
		conf.on("clearasync", function (cache) {
			forEach(cache, function (result, id) { del(id, result); });
		});
		return;
	}
	conf.on("delete", (del = function (id, result) { dispose(result); }));
	conf.on("clear", function (cache) {
		forEach(cache, function (result, id) { del(id, result); });
	});
};