| /* |
| * 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.solr.util; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.RandomAccessFile; |
| import java.nio.channels.FileChannel; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| |
| import org.apache.commons.io.FileExistsException; |
| |
| /** |
| * |
| */ |
| public class FileUtils { |
| |
| /** |
| * Resolves a path relative a base directory. |
| * |
| * <p> |
| * This method does what "new File(base,path)" <b>Should</b> do, if it wasn't |
| * completely lame: If path is absolute, then a File for that path is returned; |
| * if it's not absolute, then a File is returned using "path" as a child |
| * of "base") |
| * </p> |
| */ |
| public static File resolvePath(File base, String path) { |
| File r = new File(path); |
| return r.isAbsolute() ? r : new File(base, path); |
| } |
| |
| public static void copyFile(File src , File destination) throws IOException { |
| try (FileChannel in = new FileInputStream(src).getChannel(); |
| FileChannel out = new FileOutputStream(destination).getChannel()) { |
| in.transferTo(0, in.size(), out); |
| } |
| } |
| |
| /** |
| * Copied from Lucene's FSDirectory.fsync(String) |
| * |
| * @param fullFile the File to be synced to disk |
| * @throws IOException if the file could not be synced |
| */ |
| public static void sync(File fullFile) throws IOException { |
| if (fullFile == null || !fullFile.exists()) |
| throw new FileNotFoundException("File does not exist " + fullFile); |
| |
| boolean success = false; |
| int retryCount = 0; |
| IOException exc = null; |
| while(!success && retryCount < 5) { |
| retryCount++; |
| try (RandomAccessFile file = new RandomAccessFile(fullFile, "rw")) { |
| file.getFD().sync(); |
| success = true; |
| } catch (IOException ioe) { |
| if (exc == null) |
| exc = ioe; |
| try { |
| // Pause 5 msec |
| Thread.sleep(5); |
| } catch (InterruptedException ie) { |
| Thread.currentThread().interrupt(); |
| } |
| } |
| } |
| if (!success) |
| // Throw original exception |
| throw exc; |
| } |
| |
| public static boolean fileExists(String filePathString) { |
| return new File(filePathString).exists(); |
| } |
| |
| // Files.createDirectories has odd behavior if the path is a symlink and it already exists |
| // _even if it's a symlink to a directory_. |
| // |
| // oddly, if the path to be created just contains a symlink in intermediate levels, Files.createDirectories |
| // works just fine. |
| // |
| // This works around that issue |
| public static Path createDirectories(Path path) throws IOException { |
| if (Files.exists(path) && Files.isSymbolicLink(path)) { |
| Path real = path.toRealPath(); |
| if (Files.isDirectory(real)) return real; |
| throw new FileExistsException("Tried to create a directory at to an existing non-directory symlink: " + path.toString()); |
| } |
| return Files.createDirectories(path); |
| } |
| } |