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typo3/sysext/backend/Classes/Tree/AbstractTreeDataProvider.php

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+<?php
+namespace TYPO3\CMS\Backend\Tree;
+
+/*
+ * This file is part of the TYPO3 CMS project.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.txt file that was distributed with this source code.
+ *
+ * The TYPO3 project - inspiring people to share!
+ */
+
+/**
+ * Abstract Tree Data Provider
+ */
+abstract class AbstractTreeDataProvider
+{
+    /**
+     * Root Node
+     *
+     * @var \TYPO3\CMS\Backend\Tree\TreeNode
+     */
+    protected $rootNode;
+
+    /**
+     * Returns the root node
+     *
+     * @return \TYPO3\CMS\Backend\Tree\TreeNode
+     */
+    abstract public function getRoot();
+
+    /**
+     * Fetches the subnodes of the given node
+     *
+     * @param \TYPO3\CMS\Backend\Tree\TreeNode $node
+     * @return \TYPO3\CMS\Backend\Tree\TreeNodeCollection
+     */
+    abstract public function getNodes(\TYPO3\CMS\Backend\Tree\TreeNode $node);
+}