subject.js
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subject.js
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	"use strict";
	const locreq = require("locreq")(__dirname);
	const Promise = require("bluebird");
	const SubjectPath = locreq("lib/data-structures/subject-path.js");

	function Subject (){}

	Subject.prototype = new function(){
	this.get_subject = function(subject_path){
	// This is a recursive function. It traverses the subject tree and returns
	// the subject referenced by subject_path
	subject_path = new SubjectPath(subject_path);
	return Promise.resolve(this.get_child_subject(subject_path.head()))
	.then(function(child_subject){
	if (subject_path.elements.length === 1){
	return child_subject;
	} else {
	return child_subject.get_subject(subject_path.tail());
	}
	});
	};
	};


	module.exports = Subject;