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| 1 | <?php |
| 2 | |
| 3 | /* |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; under version 2 |
| 7 | * of the License (non-upgradable). |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 17 | * |
| 18 | * Copyright (c) 2008-2010 (original work) Deutsche Institut für Internationale Pädagogische Forschung |
| 19 | * (under the project TAO-TRANSFER); |
| 20 | * 2009-2012 (update and modification) Public Research Centre Henri Tudor |
| 21 | * (under the project TAO-SUSTAIN & TAO-DEV); |
| 22 | */ |
| 23 | |
| 24 | /** |
| 25 | * The ItemExporter class acts as the foundation for exporting item in XML packages. Developpers |
| 26 | * who wants to create dedicated export behaviours can extend this class. To create a new export behaviour |
| 27 | * developpers only need to implement the export abstract method. This is especially useful if a developper |
| 28 | * needs to apply specific export procedures for items of a given Item Model. When you extend this class, you have |
| 29 | * to respect a class naming convention. Actually, the class name must logicaly bound to the related Item Model label |
| 30 | * in the knowledge base. |
| 31 | * |
| 32 | * QTI Items have their Item Model labeled QTI. Your ItemExporter should be then: |
| 33 | * - named QTIItemExport where QTI is the Item model label, and ItemExport a suffix by convention. |
| 34 | * - and the file containing its definition should be named class.QTIItemExport.php. |
| 35 | * |
| 36 | * When an item matching the QTI item model will be exported, the class QTIItemExporter will be dynamically loaded |
| 37 | * and its QTIItemExporter::export() method invoked. |
| 38 | * |
| 39 | * @author CRP Henri Tudor - TAO Team - {@link http://www.tao.lu} |
| 40 | * @license GPLv2 http://www.opensource.org/licenses/gpl-2.0.php |
| 41 | * @package taoItems |
| 42 | |
| 43 | */ |
| 44 | |
| 45 | use Psr\Http\Message\StreamInterface; |
| 46 | |
| 47 | abstract class taoItems_models_classes_ItemExporter |
| 48 | { |
| 49 | private $item; |
| 50 | private $zip; |
| 51 | |
| 52 | /** |
| 53 | * Creates a new instance of ItemExporter for a particular item. |
| 54 | * |
| 55 | * @param core_kernel_classes_Resource $item The item to be exported. |
| 56 | * @param ZipArchive $zip The ZIP archive were the files have to be exported. |
| 57 | */ |
| 58 | public function __construct(core_kernel_classes_Resource $item, ZipArchive $zip) |
| 59 | { |
| 60 | $this->setItem($item); |
| 61 | $this->setZip($zip); |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * Obtains a reference on the TAO Item Service. |
| 66 | * |
| 67 | * @return taoItems_models_classes_ItemsService A TAO Item Service. |
| 68 | */ |
| 69 | protected function getItemService() |
| 70 | { |
| 71 | return taoItems_models_classes_ItemsService::singleton(); |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Obtains a reference on the currently exported instance of Item. |
| 76 | * |
| 77 | * @return core_kernel_classes_Resource The currently exported item. |
| 78 | */ |
| 79 | protected function getItem() |
| 80 | { |
| 81 | return $this->item; |
| 82 | } |
| 83 | |
| 84 | protected function setItem(core_kernel_classes_Resource $item) |
| 85 | { |
| 86 | $this->item = $item; |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * Obtains a reference on the Zip Archive where the files related to the exported items will be stored. |
| 91 | * |
| 92 | * @return ZipArchive A created and open ZipArchive instance. |
| 93 | */ |
| 94 | public function getZip() |
| 95 | { |
| 96 | return $this->zip; |
| 97 | } |
| 98 | |
| 99 | public function setZip(ZipArchive $zip) |
| 100 | { |
| 101 | $this->zip = $zip; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Obtains a reference on the Item Model related to the currently exported item instance. |
| 106 | * |
| 107 | * @return core_kernel_classes_Container |
| 108 | */ |
| 109 | protected function getItemModel() |
| 110 | { |
| 111 | try { |
| 112 | return $this |
| 113 | ->getItem() |
| 114 | ->getUniquePropertyValue( |
| 115 | new core_kernel_classes_Property(taoItems_models_classes_ItemsService::PROPERTY_ITEM_MODEL) |
| 116 | ); |
| 117 | } catch (common_Exception $e) { |
| 118 | return null; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | protected function getItemDirectory() |
| 123 | { |
| 124 | return $this->getItemService()->getItemDirectory($this->getItem()); |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Add files or folders (and their content) to the Zip Archive that will contain all the files to the current export |
| 129 | * session. |
| 130 | * For instance, if you want to copy the file 'taoItems/data/i123/item.xml' as 'myitem.xml' to your archive call |
| 131 | * addFile('path_to_item_location/item.xml', 'myitem.xml'). |
| 132 | * As a result, you will get a file entry in the final ZIP archive at '/i123/myitem.xml'. |
| 133 | * |
| 134 | * @param string | StreamInterface $src The path to the source file or folder to copy into the ZIP Archive. |
| 135 | * @param string *dest The <u>relative</u> to the destination within the ZIP archive. |
| 136 | * @return integer The amount of files that were transfered from TAO to the ZIP archive within the method call. |
| 137 | */ |
| 138 | public function addFile($src, $dest) |
| 139 | { |
| 140 | $zip = $this->getZip(); |
| 141 | return tao_helpers_File::addFilesToZip($zip, $src, $dest); |
| 142 | } |
| 143 | |
| 144 | abstract public function export(); |
| 145 | } |