collections-subject.js
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collections-subject.js
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	"use strict";
	const locreq = require("locreq")(__dirname);
	const Promise = require("bluebird");

	const Errors = locreq("lib/response/error.js");
	const Subject = locreq("lib/subject/subject.js");

	const CollectionSubject = locreq(
	"lib/subject/subject-types/collection-subject.js"
	);

	const CollectionsSubject = function(app) {
	this.resource_collections = null;

	this._initialize_resource_collections = function() {
	this.resource_collections = {};
	const collections = app.ChipManager.get_chips_by_type("collection");
	for (const collection_name in collections) {
	const collection = collections[collection_name];
	this.resource_collections[collection_name] = new CollectionSubject(
	app,
	collection
	);
	}
	};

	this.get_child_subject = function(key) {
	if (
	this.resource_collections === null \|\|
	this.resource_collections[key] === undefined
	) {
	this._initialize_resource_collections();
	}
	if (this.resource_collections[key] === undefined) {
	throw new Errors.BadSubjectPath(`Unknown collection: '${key}'.`);
	}
	return Promise.resolve(this.resource_collections[key]);
	};

	this.perform_action = function(context, action_name, args) {
	throw new Errors.BadSubjectAction(
	"This subject does not provide any actions."
	);
	};
	};

	CollectionsSubject.prototype = Object.create(Subject.prototype);
	CollectionsSubject.subject_name = "collections";

	module.exports = CollectionsSubject;