Java tutorial
/*************************GO-LICENSE-START********************************* * Copyright 2014 ThoughtWorks, Inc. * * Licensed 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. *************************GO-LICENSE-END***********************************/ package com.thoughtworks.go.helpers; import java.io.File; import java.io.IOException; import org.apache.commons.io.FileUtils; public final class FileSystemUtils { private static final String ROOT = "target" + File.separator + "testfiles"; static { new File("target").mkdir(); } private FileSystemUtils() { } public static File createDirectory(String directoryName) { File directory = new File(getTestRootDir(), directoryName); deleteDirectory(directory); directory.mkdir(); directory.deleteOnExit(); return directory; } private static void deleteDirectory(File directory) { try { FileUtils.deleteDirectory(directory); } catch (IOException e) { } } public static File createDirectory(String directoryName, String parent) { File directory = new File(getTestRootDir(), parent + File.separator + directoryName); deleteDirectory(directory); directory.mkdir(); directory.deleteOnExit(); return directory; } public static File getTestRootDir() { File root = new File(ROOT); if (!root.exists() && !root.mkdir()) { throw new RuntimeException("Failed to create directory for test data [" + root.getAbsolutePath() + "]"); } return root; } public static File createFile(String filename, File directory) throws IOException { final File file = new File(directory, filename); // attempt workaround for intermitent w2k error: // java.io.IOException: Access is denied // at java.io.WinNTFileSystem.createFileExclusively(Native Method) // at java.io.File.createNewFile(File.java:883) // at net.sourceforge.cruisecontrol.dashboard.testhelpers.FilesystemUtils.createFile(FilesystemUtils.java:94) // ... // see: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6198547 // see: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6325169 int count = 0; IOException lastIOException = null; do { try { file.createNewFile(); } catch (IOException e) { lastIOException = e; Thread.yield(); } count++; } while (!file.exists() && count < 3); // another attempt to workaround the above bugs, using approach similar to that of Ant MkDirs taskdef // see Util.doMkDirs() if (!file.exists()) { try { Thread.sleep(10); try { file.createNewFile(); } catch (IOException e) { lastIOException = e; } } catch (InterruptedException ex) { try { file.createNewFile(); } catch (IOException e) { lastIOException = e; } } } if (!file.exists()) { if (lastIOException != null) { throw new RuntimeException("Error creating file: " + file.getAbsolutePath(), lastIOException); } else { throw new RuntimeException("Error creating file: " + file.getAbsolutePath()); } } file.deleteOnExit(); return file; } public static File createFile(String filename) throws IOException { File file = new File(ROOT + File.separator + filename); file.createNewFile(); file.deleteOnExit(); return file; } }