build tree from text, text structure definition:* * FolderName: * [FileName:][FileSize:][Modified:]Url */* * For example: * folder1: * name1:url1 * url2 * folder2: * url3 * url4 * url5 * folder3: * url6 * url7 * url8 */ if there are no name, use the last segment of url as name.

Node is a node in the folder tree.