UnityEditor.PackageExportTreeView.PackageExportTreeViewDataSource.FetchData C# (CSharp) Method

            public override void FetchData()
            {
                int depth = -1;
                base.m_RootItem = new PackageExportTreeView.PackageExportTreeViewItem(null, "Assets".GetHashCode(), depth, null, "InvisibleAssetsFolder");
                bool initExpandedState = true;
                if (initExpandedState)
                {
                    base.m_TreeView.state.expandedIDs.Add(base.m_RootItem.id);
                }
                ExportPackageItem[] items = this.m_PackageExportView.items;
                Dictionary<string, PackageExportTreeView.PackageExportTreeViewItem> treeViewFolders = new Dictionary<string, PackageExportTreeView.PackageExportTreeViewItem>();
                for (int i = 0; i < items.Length; i++)
                {
                    ExportPackageItem itemIn = items[i];
                    if (!PackageImport.HasInvalidCharInFilePath(itemIn.assetPath))
                    {
                        string fileName = Path.GetFileName(itemIn.assetPath);
                        string directoryName = Path.GetDirectoryName(itemIn.assetPath);
                        TreeViewItem parent = this.EnsureFolderPath(directoryName, treeViewFolders, initExpandedState);
                        if (parent != null)
                        {
                            int hashCode = itemIn.assetPath.GetHashCode();
                            PackageExportTreeView.PackageExportTreeViewItem child = new PackageExportTreeView.PackageExportTreeViewItem(itemIn, hashCode, parent.depth + 1, parent, fileName);
                            parent.AddChild(child);
                            if (initExpandedState)
                            {
                                base.m_TreeView.state.expandedIDs.Add(hashCode);
                            }
                            if (itemIn.isFolder)
                            {
                                treeViewFolders[itemIn.assetPath] = child;
                            }
                        }
                    }
                }
                if (initExpandedState)
                {
                    base.m_TreeView.state.expandedIDs.Sort();
                }
            }