not.js
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not.js
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	"use strict";
	const locreq = require("locreq")(__dirname);
	const Promise = require("bluebird");
	const AccessStrategy = locreq("lib/chip-types/access-strategy.js");
	const Query = locreq("lib/datastore/query.js");

	function parse_params(app, params) {
	let strategies;
	if (params instanceof Array) {
	strategies = params.map(
	declaration => new AccessStrategy(app, declaration)
	);
	} else {
	strategies = [new AccessStrategy(app, params)];
	}
	return strategies;
	}

	module.exports = function(app) {
	return {
	name: "not",
	getRestrictingQuery: async function(context, params) {
	//assuming "not" can take only one access strategy as a parameter
	const strategy = parse_params(app, params)[0];

	const query = await strategy.getRestrictingQuery(context);
	return new Query.Not(query);
	},
	item_sensitive: function(params) {
	const access_strategies = parse_params(app, params);
	return Promise.map(access_strategies, function(access_strategy) {
	return access_strategy.is_item_sensitive();
	}).reduce((a, b) => a \|\| b, false);
	},
	checker_function: function(context, params, item) {
	const strategies = parse_params(app, params);
	return Promise.map(strategies, function(strategy) {
	return strategy.check(context, item);
	})
	.any()
	.then(function() {
	return Promise.reject("Action not allowed");
	})
	.catch({ sealious_error: true }, function() {
	return Promise.resolve();
	});
	},
	};
	};