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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* XML format exporter class
*
* @package core_dtl
* @copyright 2008 Andrei Bautu
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* XML format exporter class.
* Provides logic for writing XML tags and data inside appropriate callbacks.
* Subclasses should define XML data sinks.
*/
abstract class xml_database_exporter extends database_exporter {
/**
* Generic output method. Subclasses should implement it with code specific
* to the target XML sink.
*/
protected abstract function output($text);
/**
* Callback function. Outputs open XML PI and moodle_database opening tag.
*
* @param float $version the version of the system which generating the data
* @param string $release moodle release info
* @param string $timestamp the timestamp of the data (in ISO 8601) format.
* @param string $description a user description of the data.
* @return void
*/
public function begin_database_export($version, $release, $timestamp, $description) {
$this->output('<?xml version="1.0" encoding="utf-8"?>');
//TODO add xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" and schema information
$this->output('<moodle_database version="'.$version.'" release="'.$release.'" timestamp="'.$timestamp.'"'.(empty ($description) ? '' : ' comment="'.htmlspecialchars($description, ENT_QUOTES, 'UTF-8').'"').'>');
}
/**
* Callback function. Outputs table opening tag.
*
* @param xmldb_table $table - XMLDB object for the exported table
* @return void
*/
public function begin_table_export(xmldb_table $table) {
$this->output('<table name="'.$table->getName().'" schemaHash="'.$table->getHash().'">');
}
/**
* Callback function. Outputs table closing tag.
*
* @param xmldb_table $table - XMLDB object for the exported table
*/
public function finish_table_export(xmldb_table $table) {
$this->output('</table>');
}
/**
* Callback function. Outputs moodle_database closing tag.
*/
public function finish_database_export() {
$this->output('</moodle_database>');
}
/**
* Callback function. Outputs record tag with field subtags and data.
*
* @param xmldb_table $table - XMLDB object of the table from which data was retrieved
* @param object $data - data object (fields and values from record)
* @return void
*/
public function export_table_data(xmldb_table $table, $data) {
$this->output('<record>');
foreach ($data as $key => $value) {
if (is_null($value)) {
$this->output('<field name="'.$key.'" value="null" />');
} else {
$this->output('<field name="'.$key.'">'.htmlspecialchars($value, ENT_NOQUOTES, 'UTF-8').'</field>');
}
}
$this->output('</record>');
}
}