Factory to Handle Page Metadata in an AngularJS App

pageMetadata.js

(function() {
	
	'use strict';

	/**
	 * Page Metadata Factory
	 */
	function PageMetadataFactory() {
		/**
		 * Metadata object
		 * @type {object}
		 */
		var metadata = {
			description: null,
			image: null,
			keywords: null,
			noFollow: null,
			notFound: null,
			title: null,
			url: null
		};

		/**
		 * Sets all metadata to null so the default can take place
		 */
		function clear() {
			metadata.description = null;
			metadata.image        = null;
			metadata.keywords    = null;
			metadata.noFollow    = null;
			metadata.notFound    = null;
			metadata.title       = null;
			metadata.url         = null;
		}

		/**
		 * Sets metadata description
		 * @param {string} description
		 */
		function setDescription(description) {
			metadata.description = description;
		}

		/**
		 * Sets metadata image
		 * @param {string} image
		 */
		function setImage(image) {
			metadata.image = image;
		}

		/**
		 * Sets metadata keywords
		 * @param {string} keywords
		 */
		function setKeywords(keywords) {
			metadata.keywords = keywords;
		}

		/**
		 * Sets metadata noFollow
		 * @param {string} noFollow
		 */
		function setNoFollow(noFollow) {
			metadata.noFollow = noFollow;
		}

		/**
		 * Sets metadata notFound
		 * @param {string} notFound
		 */
		function setNotFound(notFound) {
			metadata.notFound = notFound;
		}

		/**
		 * Sets metadata title
		 * @param {string} title
		 */
		function setTitle(title) {
			metadata.title = title;
		}

		/**
		 * Sets metadata url
		 * @param {string} url
		 */
		function setUrl(url) {
			metadata.url = url;
		}

		return {
			clear: clear,
			data: metadata,
			setDescription: setDescription,
			setImage: setImage,
			setKeywords: setKeywords,
			setNoFollow: setNoFollow,
			setNotFound: setNotFound,
			setTitle: setTitle,
			setUrl: setUrl
		};
	}

	/**
	 * Page Metadata Controller
	 * @param {object} PageMetadata
	 */
	function PageMetadataController(PageMetadata) {

		/**
		 * Metadata object
		 * @type {object}
		 */
		this.data = PageMetadata.data;
	}

	// Inject dependency
	PageMetadataController.$inject = ['PageMetadata'];

	// Register module
	angular.module('app.pageMetadata', [])
		.controller('PageMetadataCtrl', PageMetadataController)
		.factory('PageMetadata', PageMetadataFactory);

})();