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diff --git a/lib/public/Files/SimpleFS/ISimpleFolder.php b/lib/public/Files/SimpleFS/ISimpleFolder.php
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+++ b/lib/public/Files/SimpleFS/ISimpleFolder.php
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+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCP\Files\SimpleFS;
+
+use OCP\Files\NotFoundException;
+use OCP\Files\NotPermittedException;
+
+/**
+ * Interface ISimpleFolder
+ *
+ * @since 11.0.0
+ */
+interface ISimpleFolder {
+	/**
+	 * Get all the files in a folder
+	 *
+	 * @return ISimpleFile[]
+	 * @since 11.0.0
+	 */
+	public function getDirectoryListing(): array;
+
+	/**
+	 * Check if a file with $name exists
+	 *
+	 * @param string $name
+	 * @return bool
+	 * @since 11.0.0
+	 */
+	public function fileExists(string $name): bool;
+
+	/**
+	 * Get the file named $name from the folder
+	 *
+	 * @throws NotFoundException
+	 * @since 11.0.0
+	 */
+	public function getFile(string $name): ISimpleFile;
+
+	/**
+	 * Creates a new file with $name in the folder
+	 *
+	 * @param string|resource|null $content @since 19.0.0
+	 * @throws NotPermittedException
+	 * @since 11.0.0
+	 */
+	public function newFile(string $name, $content = null): ISimpleFile;
+
+	/**
+	 * Remove the folder and all the files in it
+	 *
+	 * @throws NotPermittedException
+	 * @since 11.0.0
+	 */
+	public function delete(): void;
+
+	/**
+	 * Get the folder name
+	 *
+	 * @since 11.0.0
+	 */
+	public function getName(): string;
+
+	/**
+	 * Get the folder named $name from the current folder
+	 *
+	 * @throws NotFoundException
+	 * @since 25.0.0
+	 */
+	public function getFolder(string $name): ISimpleFolder;
+
+	/**
+	 * Creates a new folder with $name in the current folder
+	 *
+	 * @param string|resource|null $content @since 19.0.0
+	 * @throws NotPermittedException
+	 * @since 25.0.0
+	 */
+	public function newFolder(string $path): ISimpleFolder;
+}