Your IP : 18.226.187.60
<?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 importer 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 importer class (uses SAX for speed and low memory footprint).
* Provides logic for parsing XML data and calling appropriate callbacks.
* Subclasses should define XML data sources.
*/
abstract class xml_database_importer extends database_importer {
protected $current_table;
protected $current_row;
protected $current_field;
protected $current_data;
protected $current_data_is_null;
/**
* Creates and setups a SAX parser. Subclasses should use this method to
* create the XML parser.
*
* @return resource XML parser resource.
*/
protected function get_parser() {
$parser = xml_parser_create();
xml_set_object($parser, $this);
xml_set_element_handler($parser, 'tag_open', 'tag_close');
xml_set_character_data_handler($parser, 'cdata');
xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, false);
return $parser;
}
/**
* Callback function. Called by the XML parser for opening tags processing.
*
* @param resource $parser XML parser resource.
* @param string $tag name of opening tag
* @param array $attributes set of opening tag XML attributes
* @return void
*/
protected function tag_open($parser, $tag, $attributes) {
switch ($tag) {
case 'moodle_database' :
if (empty($attributes['version']) || empty($attributes['timestamp'])) {
throw new dbtransfer_exception('malformedxmlexception');
}
$this->begin_database_import($attributes['version'], $attributes['timestamp']);
break;
case 'table' :
if (isset($this->current_table)) {
throw new dbtransfer_exception('malformedxmlexception');
}
if (empty($attributes['name']) || empty($attributes['schemaHash'])) {
throw new dbtransfer_exception('malformedxmlexception');
}
$this->current_table = $attributes['name'];
$this->begin_table_import($this->current_table, $attributes['schemaHash']);
break;
case 'record' :
if (isset($this->current_row) || !isset($this->current_table)) {
throw new dbtransfer_exception('malformedxmlexception');
}
$this->current_row = new stdClass();
break;
case 'field' :
if (isset($this->current_field) || !isset($this->current_row)) {
throw new dbtransfer_exception('malformedxmlexception');
}
$this->current_field = $attributes['name'];
$this->current_data = '';
if (isset($attributes['value']) and $attributes['value'] === 'null') {
$this->current_data_is_null = true;
} else {
$this->current_data_is_null = false;
}
break;
default :
throw new dbtransfer_exception('malformedxmlexception');
}
}
/**
* Callback function. Called by the XML parser for closing tags processing.
*
* @param resource $parser XML parser resource.
* @param string $tag name of opening tag
* @return void
*/
protected function tag_close($parser, $tag) {
switch ($tag) {
case 'moodle_database' :
$this->finish_database_import();
break;
case 'table' :
$this->finish_table_import($this->current_table);
$this->current_table = null;
break;
case 'record' :
$this->import_table_data($this->current_table, $this->current_row);
$this->current_row = null;
break;
case 'field' :
$field = $this->current_field;
if ($this->current_data_is_null) {
$this->current_row->$field = null;
} else {
$this->current_row->$field = $this->current_data;
}
$this->current_field = null;
$this->current_data = null;
$this->current_data_is_null = null;
break;
default :
throw new dbtransfer_exception('malformedxmlexception');
}
}
/**
* Callback function. Called by the XML parser for character data processing.
*
* @param resource $parser XML parser resource.
* @param string $data character data to be processed
* @return void
*/
protected function cdata($parser, $data) {
if (isset($this->current_field)) {
$this->current_data .= $data;
}
}
}