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annotate classes/loader.php @ 112:7bdbc7fc7936 extractapp

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author Calvin Yeh <cyeh@mpiwg-berlin.mpg.de>
date Thu, 04 May 2017 16:57:16 +0200
parents f1f849d31272
children
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1 <?php
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2 /*
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3 * loader.php
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4 * This file is part of Extraction-interface.
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5 *
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6 * Extraction-interface is free software: you can redistribute it and/or modify
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7 * it under the terms of the GNU General Public License as published by
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8 * the Free Software Foundation, either version 3 of the License, or
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9 * (at your option) any later version.
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10 *
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11 * Extraction-interface is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 * GNU General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU General Public License
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17 * along with Extraction-interface. If not, see <http://www.gnu.org/licenses/>.
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18 */
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19
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20 /**
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21 * Loader is used to route parameters from input url and set parameters for controller.
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22 * The routing is done by the RewriteRule written in .htaccess file.
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23 */
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24
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25 class Loader {
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26 private $controller;
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27 private $action;
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28 private $urlvalues;
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29 private $postdata = 0;
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31 public function __construct($urlvalues, $postdata) {
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32 /**
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33 * It stores parameters in URL on object creation.
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34 *
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35 * For example, the URL structure is like this: some_domain_name/Extractapp/TaggingText.
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36 * The controller is "Extractapp" and the action is "TaggingText".
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37 *
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38 * For the "Extractapp" controller, there is a corresponding "extractapp.php" in "./controllers" folder.
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39 *
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40 * For the action "TaggingText", there is a corresponding "TaggingText.php" in "./views/Extractapp" folder.
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41 *
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42 * Under "./view" folder, the first level of the sub-folder is named by the controller's name.
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43 * Each action controlled by the controller has it's own php file. The file name is the same as the the action's name.
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44 */
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45
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46 $this->urlvalues = $urlvalues;
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47 $this->postdata = $postdata;
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48 if ($this->urlvalues['controller'] == "") {
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49 $this->controller = "Extractapp"; // the default controller
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50
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51 } else {
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52 $this->controller = $this->urlvalues['controller'];
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53 }
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55 if ($this->urlvalues['action'] == "") {
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56 $this->action = "TaggingText"; // the default action
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57
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58 } else {
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59 $this->action = $this->urlvalues['action'];
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60 }
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61 }
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62
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63 public function CreateController() {
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64 /**
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65 * Establish the requested controller as an object, and check if the query is valid.
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66 * The queried controller, which should be extended from BaseController, exists and the queried action should be one of its method.
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67 */
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69 //does the class exist?
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70 if (class_exists($this->controller)) {
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71 $parents = class_parents($this->controller);
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72 //does the class extend the controller class?
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73 if (in_array("BaseController",$parents)) {
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74 //does the class contain the requested method?
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75 if (method_exists($this->controller,$this->action)) {
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76 return new $this->controller($this->action,$this->urlvalues,$this->postdata);
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77 } else {
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78 //bad method error
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79 return new Error("badUrl",$this->urlvalues);
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80 }
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81 } else {
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82 //bad controller error
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83 return new Error("badUrl",$this->urlvalues);
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84 }
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85 } else {
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86 //bad controller error
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87 return new Error("badUrl",$this->urlvalues);
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88 }
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89 }
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90 }
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92 ?>