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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/>. namespace core_question\local\bank; use core\output\datafilter; /** * An abstract class for filtering/searching questions. * * @package core_question * @copyright 2013 Ray Morris * @author Safat Shahin <safatshahin@catalyst-au.net> * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later / abstract class condition { /* @var int The default filter type / const JOINTYPE_DEFAULT = datafilter::JOINTYPE_ANY; /* @var ?array Filter properties for this condition. / public ?array $filter; /* @var string SQL fragment to add to the where clause. / protected string $where = ''; /* @var array query param used in where. / protected array $params = []; /* * Return title of the condition * * @return string title of the condition / abstract public function get_title(); /* * Return filter class associated with this condition * * @return string filter class / abstract public function get_filter_class(); /* * Extract the required filter from the provided question bank view. * * This will look for the filter matching {@see get_condition_key()} * * @param view\|null $qbank / public function __construct(view $qbank = null) { if (is_null($qbank)) { return; } $this->filter = static::get_filter_from_list($qbank->get_pagevars('filter')); // Build where and params. [$this->where, $this->params] = $this->filter ? static::build_query_from_filter($this->filter) : ['', []]; } /* * Whether customisation is allowed. * * @return bool / public function allow_custom() { return true; } /* * Whether multiple values are allowed . * * @return bool / public function allow_multiple() { return true; } /* * Initial values of the condition * * @return array / public function get_initial_values() { return []; } /* * Extra data specific to this condition. * * @return \stdClass / public function get_filteroptions(): \stdClass { return (object)[]; } /* * Whether empty value is allowed * * @return bool / public function allow_empty() { return true; } /* * Whether this filter is required - if so it cannot be removed from the list of filters. * * @return bool / public function is_required(): bool { return false; } /* * Return this condition class * * @return string / public function get_condition_class() { return get_class($this); } /* * Each condition will need a unique key to be identified and sequenced by the api. * Use a unique string for the condition identifier, use string directly, dont need to use language pack. * Using language pack might break the filter object for multilingual support. * * @return string / public static function get_condition_key() { return ''; } /* * Return an SQL fragment to be ANDed into the WHERE clause to filter which questions are shown. * * @return string SQL fragment. Must use named parameters. / public function where() { return $this->where; } /* * Return parameters to be bound to the above WHERE clause fragment. * @return array parameter name => value. / public function params() { return $this->params; } /* * Display GUI for selecting criteria for this condition. Displayed when Show More is open. * * Compare display_options(), which displays always, whether Show More is open or not. * @return bool\|string HTML form fragment * @deprecated since Moodle 4.0 MDL-72321 - please do not use this function any more. * @todo Final deprecation on Moodle 4.1 MDL-72572 / public function display_options_adv() { debugging('Function display_options_adv() is deprecated, please use filtering objects', DEBUG_DEVELOPER); return false; } /* * Display GUI for selecting criteria for this condition. Displayed always, whether Show More is open or not. * * Compare display_options_adv(), which displays when Show More is open. * @return bool\|string HTML form fragment * @deprecated since Moodle 4.0 MDL-72321 - please do not use this function any more. * @todo Final deprecation on Moodle 4.1 MDL-72572 / public function display_options() { debugging('Function display_options() is deprecated, please use filtering objects', DEBUG_DEVELOPER); return false; } /* * Get the list of available joins for the filter. * * @return array / public function get_join_list(): array { return [ datafilter::JOINTYPE_NONE, datafilter::JOINTYPE_ANY, datafilter::JOINTYPE_ALL, ]; } /* * Given an array of filters, pick the entry that matches the condition key and return it. * * @param array $filters Array of filters, keyed by condition. * @return ?array The filter that matches this condition / public static function get_filter_from_list(array $filters): ?array { return $filters[static::get_condition_key()] ?? null; } /* * Build query from filter value * * @param array $filter filter properties * @return array where sql and params */ public static function build_query_from_filter(array $filter): array { return ['', []]; } }

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