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366 lines
11 KiB
366 lines
11 KiB
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* This file contains the backup user interface class
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*
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* @package core_backup
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* @copyright 2010 Sam Hemelryk
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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/**
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* This is the backup user interface class
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*
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* The backup user interface class manages the user interface and backup for
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* Moodle.
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*
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* @package core_backup
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* @copyright 2010 Sam Hemelryk
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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abstract class base_ui {
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/**
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* The progress of this instance of the backup ui class
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* It is in the initial stage.
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*/
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const PROGRESS_INTIAL = 0;
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/**
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* The progress of this instance of the backup ui class
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* It is processed.
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*/
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const PROGRESS_PROCESSED = 1;
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/**
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* The progress of this instance of the backup ui class
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* It is saved.
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*/
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const PROGRESS_SAVED = 2;
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/**
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* The progress of this instance of the backup ui class
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* It has been executed.
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*/
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const PROGRESS_EXECUTED = 3;
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/**
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* The controller
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* @var backup_controller|restore_controller
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*/
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protected $controller;
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/**
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* The current stage
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* @var base_ui_stage
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*/
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protected $stage;
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/**
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* The current progress of the UI
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* @var int One of self::PROGRESS_*
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*/
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protected $progress;
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/**
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* The number of changes made by dependency enforcement
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* @var int
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*/
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protected $dependencychanges = 0;
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/**
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* Yay for constructors
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* @param backup_controller $controller
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* @param array $params
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*/
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public function __construct($controller, array $params = null) {
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$this->controller = $controller;
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$this->progress = self::PROGRESS_INTIAL;
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$this->stage = $this->initialise_stage(null, $params);
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// Process UI event before to be safe.
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$this->controller->process_ui_event();
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}
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/**
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* Destorys the backup controller and the loaded stage.
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*/
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public function destroy() {
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if ($this->controller) {
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$this->controller->destroy();
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}
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unset($this->stage);
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}
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/**
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* Intialises what ever stage is requested. If none are requested we check
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* params for 'stage' and default to initial
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*
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* @param int|null $stage The desired stage to intialise or null for the default
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* @param array $params
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* @return base_ui_stage
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*/
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abstract protected function initialise_stage($stage = null, array $params = null);
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/**
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* This processes the current stage of the backup
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* @throws backup_ui_exception
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* @return bool
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*/
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public function process() {
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if ($this->progress >= self::PROGRESS_PROCESSED) {
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throw new backup_ui_exception('backupuialreadyprocessed');
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}
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$this->progress = self::PROGRESS_PROCESSED;
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if (optional_param('previous', false, PARAM_BOOL) && $this->stage->get_stage() > $this->get_first_stage_id()) {
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$this->stage = $this->initialise_stage($this->stage->get_prev_stage(), $this->stage->get_params());
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return false;
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}
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// Process the stage.
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$processoutcome = $this->stage->process();
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if ($processoutcome !== false) {
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$this->stage = $this->initialise_stage($this->stage->get_next_stage(), $this->stage->get_params());
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}
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// Process UI event after to check changes are valid.
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$this->controller->process_ui_event();
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return $processoutcome;
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}
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/**
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* Saves the backup controller.
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*
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* Once this has been called nothing else can be changed in the controller.
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*
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* @throws base_ui_exception
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* @return bool
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*/
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public function save_controller() {
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if ($this->progress >= self::PROGRESS_SAVED) {
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throw new base_ui_exception('backupuialreadysaved');
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}
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$this->progress = self::PROGRESS_SAVED;
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// First enforce dependencies.
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$this->enforce_dependencies();
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// Process UI event after to check any changes are valid.
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$this->controller->process_ui_event();
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// Save the controller.
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$this->controller->save_controller();
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return true;
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}
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/**
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* Displays the UI for the backup!
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*
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* @throws base_ui_exception
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* @param core_backup_renderer $renderer
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* @return string HTML code to echo
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*/
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public function display(core_backup_renderer $renderer) {
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if ($this->progress < self::PROGRESS_SAVED) {
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throw new base_ui_exception('backupsavebeforedisplay');
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}
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return $this->stage->display($renderer);
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}
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/**
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* Gets all backup tasks from the controller
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* @return array Array of backup_task
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*/
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public function get_tasks() {
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$plan = $this->controller->get_plan();
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$tasks = $plan->get_tasks();
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return $tasks;
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}
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/**
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* Gets the stage we are on
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* @return int
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*/
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public function get_stage() {
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return $this->stage->get_stage();
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}
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/**
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* Gets the name of the stage we are on
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* @return string
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*/
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public function get_stage_name() {
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return $this->stage->get_name();
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}
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/**
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* Gets the backup id from the controller
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* @return string
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*/
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abstract public function get_uniqueid();
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/**
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* Executes the backup plan
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* @return bool
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*/
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abstract public function execute();
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/**
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* Enforces dependencies on all settings. Call before save
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* @return bool True if dependencies were enforced and changes were made
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*/
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protected function enforce_dependencies() {
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// Get the plan.
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$plan = $this->controller->get_plan();
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// Get the tasks as a var so we can iterate by reference.
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$tasks = $plan->get_tasks();
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$changes = 0;
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foreach ($tasks as &$task) {
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// Store as a var so we can iterate by reference.
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$settings = $task->get_settings();
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foreach ($settings as &$setting) {
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// Get all dependencies for iteration by reference.
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$dependencies = $setting->get_dependencies();
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foreach ($dependencies as &$dependency) {
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// Enforce each dependency.
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if ($dependency->enforce()) {
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$changes++;
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}
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}
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}
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}
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// Store the number of settings that changed through enforcement.
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$this->dependencychanges = $changes;
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return ($changes > 0);
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}
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/**
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* Returns true if enforce_dependencies changed any settings
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* @return bool
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*/
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public function enforce_changed_dependencies() {
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return ($this->dependencychanges > 0);
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}
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/**
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* Loads the backup controller if we are tracking one
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* @throws coding_exception
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* @param string|bool $uniqueid
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* @return backup_controller|false
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*/
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public static function load_controller($uniqueid = false) {
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throw new coding_exception('load_controller() method needs to be overridden in each subclass of base_ui');
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}
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/**
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* Cancels the current backup/restore and redirects the user back to the relevant place
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*/
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public function cancel_process() {
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global $PAGE;
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// Determine the appropriate URL to redirect the user to.
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if ($PAGE->context->contextlevel == CONTEXT_MODULE && $PAGE->cm !== null) {
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$relevanturl = new moodle_url('/mod/'.$PAGE->cm->modname.'/view.php', array('id' => $PAGE->cm->id));
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} else {
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$relevanturl = new moodle_url('/course/view.php', array('id' => $PAGE->course->id));
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}
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redirect($relevanturl);
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}
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/**
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* Gets an array of progress bar items that can be displayed through the backup renderer.
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* @return array Array of items for the progress bar
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*/
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abstract public function get_progress_bar();
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/**
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* Gets the format for the backup
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* @return int
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*/
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public function get_format() {
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return $this->controller->get_format();
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}
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/**
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* Gets the type of the backup
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* @return int
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*/
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public function get_type() {
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return $this->controller->get_type();
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}
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/**
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* Returns the controller object.
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* @return backup_controller|restore_controller
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*/
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public function get_controller() {
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return $this->controller;
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}
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/**
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* Gets the ID used in creating the controller. Relates to course/section/cm
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* @return int
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*/
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public function get_controller_id() {
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return $this->controller->get_id();
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}
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/**
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* Gets the requested setting
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* @param string $name
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* @param bool $default
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* @return base_setting
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*/
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public function get_setting($name, $default = false) {
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try {
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return $this->controller->get_plan()->get_setting($name);
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} catch (Exception $e) {
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debugging('Failed to find the setting: '.$name, DEBUG_DEVELOPER);
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return $default;
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}
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}
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/**
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* Gets the value for the requested setting
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*
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* @param string $name
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* @param bool $default
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* @return mixed
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*/
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public function get_setting_value($name, $default = false) {
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try {
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return $this->controller->get_plan()->get_setting($name)->get_value();
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} catch (Exception $e) {
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debugging('Failed to find the setting: '.$name, DEBUG_DEVELOPER);
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return $default;
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}
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}
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/**
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* Returns the name of this stage.
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* @return mixed
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*/
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abstract public function get_name();
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/**
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* Returns the first stage ID.
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* @return mixed
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*/
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abstract public function get_first_stage_id();
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}
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/**
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* Backup user interface exception. Modelled off the backup_exception class
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*
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* @package core_backup
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* @copyright 2010 Sam Hemelryk
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class base_ui_exception extends backup_exception {}
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