| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.jackrabbit.oak.plugins.blob; |
| |
| import java.io.File; |
| import java.io.IOException; |
| |
| import org.apache.commons.io.FileUtils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Common utility methods used for DataStore caches. |
| */ |
| public class DataStoreCacheUtils { |
| private static final Logger LOG = LoggerFactory.getLogger(DataStoreCacheUtils.class); |
| |
| /** |
| * Delete the file from the given root directory all its empty parent-directories. |
| * |
| * @param f the file to be deleted |
| * @throws IOException |
| */ |
| public static void recursiveDelete(File f, File root) throws IOException { |
| if (f.exists()) { |
| FileUtils.forceDelete(f); |
| LOG.info("Deleted file [{}]", f); |
| } |
| |
| // delete empty parent folders (except the main directory) |
| while (true) { |
| f = f.getParentFile(); |
| if ((f == null) || f.equals(root) |
| || (f.list() == null) |
| || (f.list().length > 0)) { |
| break; |
| } |
| LOG.debug("Deleted directory [{}], [{}]", f, f.delete()); |
| } |
| } |
| |
| /** |
| * Obtain a placeholder in the file system folder for the given identifier. |
| * |
| * @param id of the file |
| * @return file handle |
| */ |
| public static File getFile(String id, File root) { |
| File file = root; |
| file = new File(file, id.substring(0, 2)); |
| file = new File(file, id.substring(2, 4)); |
| file = new File(file, id.substring(4, 6)); |
| file.mkdirs(); |
| return new File(file, id); |
| } |
| } |