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* @fileoverview Main MVC application class.
* @author Dmytro Antonenko <dmitry.antonenko@pubwebkit.com>
*/
import {ActionEvent} from './events/action_event.js';
import {ActionExceptionEvent} from './events/action_exception_event.js';
import {ActionFilterContext} from './types/action_filter_context.js';
import {ActionFilterItem} from './types/action_filter_item.js';
import {ActionFilter} from './action_filter.js';
import {ApplicationEventType} from './application_event_type.js';
import {ApplicationFilterItem} from './types/application_filter_item.js';
import {ApplicationFilter} from './application_filter.js';
import {Controller} from './controller.js';
import {Request} from './request.js';
import {Response} from './response.js';
import {Router} from './router.js';
const EventTarget = goog.require('goog.events.EventTarget');
const Promise = goog.require('goog.Promise');
const array = goog.require('goog.array');
const dom = goog.require('goog.dom');
const gString = goog.require('goog.string');
/**
* RegExp to parse route fragment.
*/
const ROUTE_PATTERN_REGEXP = /:[a-zA-Z0-9._-]*/g;
/**
* @abstract
* @extends {EventTarget}
*/
export class Application extends EventTarget {
constructor() {
super();
/**
* @const {!Router}
* @private
*/
this.router_ = new Router(false, undefined, this.getHistoryStateInput_());
/**
* @const {!Array<!ActionFilterItem>}
* @private
*/
this.actionFilters_ = [];
/**
* @const {!Array<!ApplicationFilterItem>}
* @private
*/
this.applicationFilters_ = [];
/**
* The fragment we are mapping the controller to.
* @type {!RegExp}
* @private
*/
this.currentRoute_;
/**
* @type {boolean}
* @private
*/
this.isFirstLoad_ = true;
/**
* Initialized controllers map.
* @const {!Map<string, !Controller>}
* @private
*/
this.controllersMap_ = new Map();
// Initialize application.
this.init();
// Run application.
this.run();
}
/**
* Gets history state input field. Creates new one if it's not exist in the
* document.
* @returns {!HTMLInputElement}
* @private
*/
getHistoryStateInput_() {
const id = 'history_state';
let inputElement = dom.getElement(id);
if (inputElement == null) {
const attributes = {
'id' : id,
'type' : 'text',
'name' : 'history_state',
'style' : 'display:none'
};
inputElement = dom.createDom('input', attributes);
dom.getDocument().body.appendChild(inputElement);
}
return /** @type {!HTMLInputElement} **/ (inputElement);
}
/**
* Map route to controller.
* @param {string} route The path The fragment we are mapping the controller
* to.
* @param {!Function} controller The name or object that identifying the
* desired controller.
*/
mapRoute(route, controller) {
if(!gString.endsWith(route, '{?*}') && route !== '*') {
route += '{?*}';
}
this.router_.route(
route, goog.partial(this.processRoute_, route, controller).bind(this));
}
/**
* Gets all defined routes in the application.
* @returns {!Array<!Object>}
*/
getRoutes() {
return this.router_.getRoutes();
}
/**
* Gets application router class.
* @returns {!Router}
*/
getRouter() {
return this.router_;
}
/**
* @param {string} route The fragment we are mapping the controller to.
* @param {function(new:Controller)} controller Controller constructor
* related to current route.
* @private
*/
processRoute_(route, controller) {
this.setCurrentRoute_(route);
const controllersMap = this.controllersMap_;
if (!controllersMap.has(route)) {
controllersMap.set(route, new controller());
}
const pattern = ROUTE_PATTERN_REGEXP;
const controllerInstance = controllersMap.get(route);
const routeData = {
'action': 'index',
'controller': controllerInstance.getControllerName(),
'isFirstLoad': this.isFirstLoad_
};
for (let i = 3, match; (match = pattern.exec(route)) !== null; i++) {
if (arguments[i] !== undefined) {
routeData[gString.removeAll(match[0], ':')] = arguments[i];
}
}
const queryVals = arguments[arguments.length - 1];
const request = new Request(routeData, window.location.href, queryVals);
const response = new Response(request, this.router_);
const filterContext = new ActionFilterContext(request, response);
if (typeof controllerInstance[routeData['action']] === 'function') {
new Promise((resolve, reject) => {
let event = new ActionEvent(filterContext,
ApplicationEventType.ACTIONEXECUTING, resolve, this);
this.dispatchEvent(event);
})
.then(() => {
return new Promise((resolve, reject) => {
resolve(controllerInstance[routeData['action']](request, response));
});
})
.then(() => {
return new Promise((resolve, reject) => {
let event = new ActionEvent(filterContext,
ApplicationEventType.ACTIONEXECUTED, resolve, this);
this.dispatchEvent(event);
});
})
.then(() => {
return new Promise((resolve, reject) => {
// Application loaded
resolve(this.dispatchEvent(ApplicationEventType.APPLICATIONLOADED));
});
})
.thenCatch((error) => {
if (error instanceof Error) {
let event = new ActionExceptionEvent(filterContext, this, error);
this.dispatchEvent(event);
}
});
} else {
throw new Error(`Action "${routeData['action']}" does not exist!`);
}
}
/**
* Register application filter
* @param {!ApplicationFilter} filter
* @param {number=} opt_order
*/
addApplicationFilter(filter, opt_order) {
array.insert(
this.applicationFilters_, new ApplicationFilterItem(filter, opt_order));
}
/**
* Register action filter
* @param {!ActionFilter} filter
* @param {string|!RegExp=} opt_route Route to watch for.
* @param {number=} opt_order
*/
addActionFilter(filter, opt_route, opt_order) {
array.insert(
this.actionFilters_, new ActionFilterItem(filter, opt_route, opt_order));
}
/**
* Start application execution
*/
run() {
// Initialize events
this.listenOnce(ApplicationEventType.APPLICATIONSTART,
this.onApplicationStart_, false, this);
this.listenOnce(ApplicationEventType.APPLICATIONRUN,
this.onApplicationRun_, false, this);
this.listenOnce(ApplicationEventType.APPLICATIONLOADED,
this.onApplicationLoaded_, false, this);
this.listen(ApplicationEventType.ACTIONEXCEPTION,
this.onActionException_, false, this);
this.listen(ApplicationEventType.ACTIONEXECUTING,
this.onActionExecuting_, false, this);
this.listen(ApplicationEventType.ACTIONEXECUTED,
this.onActionExecuted_, false, this);
// Sort application filters
array.sort(this.applicationFilters_, (a, b) => a.getOrder() - b.getOrder());
// Application start
this.dispatchEvent(ApplicationEventType.APPLICATIONSTART);
// Sort action filters
array.sort(this.actionFilters_, (a, b) => a.getOrder() - b.getOrder());
// Check current route
this.router_.checkRoutes();
// Application run
this.dispatchEvent(ApplicationEventType.APPLICATIONRUN);
}
/**
* Called before the action method is invoked.
* @param {!ActionEvent} e
* @private
*/
onActionExecuting_(e) {
this.forEachActionFilter_(
(filterItem) => filterItem.getFilter().onActionExecuting(e));
e.resolvePromise();
}
/**
* Called after the action method is invoked.
* @param {!ActionEvent} e
* @private
*/
onActionExecuted_(e) {
this.forEachActionFilter_(
(filterItem) => filterItem.getFilter().onActionExecuted(e));
e.resolvePromise();
}
/**
* Called when an unhandled exception occurs in the action.
* @param {!ActionExceptionEvent} e
* @private
*/
onActionException_(e) {
let exceptionHandled = false;
this.forEachActionFilter_((filterItem) => {
exceptionHandled = true;
filterItem.getFilter().onException(e);
});
// Print error to console if not handled
Iif (!exceptionHandled) {
console.error(e.getError(), e);
}
e.resolvePromise();
}
/**
* Called when an application start initialization.
* @param {!Event} e
* @private
*/
onApplicationStart_(e) {
const router = this.router_;
this.forEachApplicationFilter_((filterItem) => {
filterItem.getFilter().onApplicationStart(e, router);
});
}
/**
* Called when an application end initialization.
* @param {!Event} e
* @private
*/
onApplicationRun_(e) {
const router = this.router_;
this.forEachApplicationFilter_((filterItem) => {
filterItem.getFilter().onApplicationRun(e, router);
});
}
/**
* Called when an application launched.
* @param {!Event} e
* @private
*/
onApplicationLoaded_(e) {
const router = this.router_;
this.forEachApplicationFilter_((filterItem) => {
filterItem.getFilter().onApplicationLoaded(e, router);
});
this.isFirstLoad_ = false;
}
/**
* Calls a function for each registered application filter.
* @param {!Function} callback
* @private
*/
forEachApplicationFilter_(callback) {
array.forEach(this.applicationFilters_, (filterItem) => {
callback.call(this, filterItem);
}, this);
}
/**
* Calls a function for each registered action filter, but skip filters with
* route that not match current route.
* @param {!Function} callback
* @private
*/
forEachActionFilter_(callback) {
const currentRoute = this.currentRoute_;
array.forEach(this.actionFilters_, (filterItem) => {
// Check route and run
let route = filterItem.getRoute();
if (gString.isEmptyOrWhitespace(gString.makeSafe(route)) ||
currentRoute.exec(route)) {
callback.call(this, filterItem);
}
}, this);
}
/**
* @param {string} route
* @private
*/
setCurrentRoute_(route) {
this.currentRoute_ =
new RegExp('^' + gString.regExpEscape(route)
.replace(/\\:\w+/g, '([a-zA-Z0-9._-]+)')
.replace(/\\\*/g, '(.*)')
.replace(/\\\[/g, '(')
.replace(/\\\]/g, ')?')
.replace(/\\\{/g, '(?:')
.replace(/\\\}/g, ')?') + '$');
}
/**
* Initialize application.
* @abstract
*/
init() {}
}
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