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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; /** * Abstract class to define functionality shared by all pluggable components used in the question bank view. * * @package core_question * @copyright 2023 onwards Catalyst IT EU {@link https://catalyst-eu.net} * @author Mark Johnson <mark.johnson@catalyst-eu.net> * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later / abstract class view_component { /* @var view Question bank view. / protected $qbank; /* * Constructor. * @param view $qbank the question bank view we are helping to render. / public function __construct(view $qbank) { $this->qbank = $qbank; $this->init(); } /* * A chance for subclasses to initialise themselves, for example to load lang strings, * without having to override the constructor. / protected function init(): void { } /* * Return an array 'table_alias' => 'JOIN clause' to bring in any data that * this feature requires. * * The return values for all the features will be checked. It is OK if two * features join in the same table with the same alias and identical JOIN clauses. * If two features try to use the same alias with different joins, you get an error. * Tables included by default are question (alias q) and those defined in {@see view::get_required_joins()} * * It is importnat that your join simply adds additional data (or NULLs) to the * existing rows of the query. It must not cause additional rows. * * @return string[] 'table_alias' => 'JOIN clause' / public function get_extra_joins(): array { return []; } /* * Use table alias 'q' for the question table, or one of the * ones from get_extra_joins. Every field requested must specify a table prefix. * * @return string[] fields required. */ public function get_required_fields(): array { return []; } }

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