72 lines
2.4 KiB
PHP
72 lines
2.4 KiB
PHP
<?php
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/**
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; under version 2
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* of the License (non-upgradable).
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright (c) 2014 (original work) Open Assessment Technologies SA (under the project TAO-PRODUCT);
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*
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*/
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use qtism\runtime\pci\json\Marshaller;
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use qtism\common\datatypes\QtiFile;
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/**
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* This specialization of the QTISM JSON PCI Marshaller aims at marshalling
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* QTI file datatypes in a different manner than the original one.
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*
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* Indeed, when a candidate comes back on a previously answered item,
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* we cannot afford to transfer large amounts of data to its client. This specialization
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* of the marshaller provides a placeholder for QTI file datatypes which actually does
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* not contain the data. The produced placeholders will have the following JSON structure:
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*
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* { "base" : { "file" : { "mime" : "qti+application/octet-stream", "data" : "placeholder_data" } } }
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*
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* @author Jérôme Bogaerts <jerome@taotesting.com>
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*
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*/
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class taoQtiCommon_helpers_PciJsonMarshaller extends Marshaller {
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/**
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* An arbitrary QTI File Datatype MIME type.
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*
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* @var integer
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*/
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const FILE_PLACEHOLDER_MIMETYPE = 'qti+application/octet-stream';
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/**
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* An arbitrary QTI File Content placeholder.
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*
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* @var integer
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*/
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const FILE_PLACEHOLDER_DATA = 'qti_file_datatype_placeholder_data';
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/**
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* Create a new PciJsonMarshaller object.
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*
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*/
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protected function construct() {
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parent::__construct();
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}
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/**
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* Marshall a file into a JSON placeholder.
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*
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* @param File $file
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* @return array
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*/
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protected function marshallFile(QtiFile $file) {
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return array('base' => array('file' => array('mime' => self::FILE_PLACEHOLDER_MIMETYPE, 'data' => base64_encode(self::FILE_PLACEHOLDER_DATA))));
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}
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}
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