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+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2023 Julius Härtl <jus@bitgrid.net
+ *
+ * @author Julius Härtl <jus@bitgrid.net
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCP\DB\Events;
+
+/**
+ * Event to allow apps to register information about missing database indices
+ *
+ * This event will be dispatched for checking on the admin settings and when running
+ * occ db:add-missing-indices which will then create those indices
+ *
+ * @since 28.0.0
+ */
+class AddMissingIndicesEvent extends \OCP\EventDispatcher\Event {
+ /** @var array<array-key, array{tableName: string, indexName: string, columns: string[]}> */
+ private array $missingIndices = [];
+
+ /**
+ * @param string[] $columns
+ * @since 28.0.0
+ */
+ public function addMissingIndex(string $tableName, string $indexName, array $columns): void {
+ $this->missingIndices[] = [
+ 'tableName' => $tableName,
+ 'indexName' => $indexName,
+ 'columns' => $columns
+ ];
+ }
+
+ /**
+ * @since 28.0.0
+ * @return array<array-key, array{tableName: string, indexName: string, columns: string[]}>
+ */
+ public function getMissingIndices(): array {
+ return $this->missingIndices;
+ }
+}