Java example source code file (todoModel.js)

This example Java source code file (todoModel.js) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

utils

The todoModel.js Java example source code

/*
 *
 *  * Copyright 2015 Skymind,Inc.
 *  *
 *  *    Licensed under the Apache License, Version 2.0 (the "License");
 *  *    you may not use this file except in compliance with the License.
 *  *    You may obtain a copy of the License at
 *  *
 *  *        http://www.apache.org/licenses/LICENSE-2.0
 *  *
 *  *    Unless required by applicable law or agreed to in writing, software
 *  *    distributed under the License is distributed on an "AS IS" BASIS,
 *  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  *    See the License for the specific language governing permissions and
 *  *    limitations under the License.
 *
 */

/*jshint quotmark:false */
/*jshint white:false */
/*jshint trailing:false */
/*jshint newcap:false */
var app = app || {};

(function () {
	'use strict';

	var Utils = app.Utils;
	// Generic "model" object. You can use whatever
	// framework you want. For this application it
	// may not even be worth separating this logic
	// out, but we do this to demonstrate one way to
	// separate out parts of your application.
	app.TodoModel = function (key) {
		this.key = key;
		this.todos = Utils.store(key);
		this.onChanges = [];
	};

	app.TodoModel.prototype.subscribe = function (onChange) {
		this.onChanges.push(onChange);
	};

	app.TodoModel.prototype.inform = function () {
		Utils.store(this.key, this.todos);
		this.onChanges.forEach(function (cb) { cb(); });
	};

	app.TodoModel.prototype.addTodo = function (title) {
		this.todos = this.todos.concat({
			id: Utils.uuid(),
			title: title,
			completed: false
		});

		this.inform();
	};

	app.TodoModel.prototype.toggleAll = function (checked) {
		// Note: it's usually better to use immutable data structures since they're
		// easier to reason about and React works very well with them. That's why
		// we use map() and filter() everywhere instead of mutating the array or
		// todo items themselves.
		this.todos = this.todos.map(function (todo) {
			return Utils.extend({}, todo, {completed: checked});
		});

		this.inform();
	};

	app.TodoModel.prototype.toggle = function (todoToToggle) {
		this.todos = this.todos.map(function (todo) {
			return todo !== todoToToggle ?
				todo :
				Utils.extend({}, todo, {completed: !todo.completed});
		});

		this.inform();
	};

	app.TodoModel.prototype.destroy = function (todo) {
		this.todos = this.todos.filter(function (candidate) {
			return candidate !== todo;
		});

		this.inform();
	};

	app.TodoModel.prototype.save = function (todoToSave, text) {
		this.todos = this.todos.map(function (todo) {
			return todo !== todoToSave ? todo : Utils.extend({}, todo, {title: text});
		});

		this.inform();
	};

	app.TodoModel.prototype.clearCompleted = function () {
		this.todos = this.todos.filter(function (todo) {
			return !todo.completed;
		});

		this.inform();
	};

})();