001 /* 002 * Sonar, open source software quality management tool. 003 * Copyright (C) 2008-2011 SonarSource 004 * mailto:contact AT sonarsource DOT com 005 * 006 * Sonar is free software; you can redistribute it and/or 007 * modify it under the terms of the GNU Lesser General Public 008 * License as published by the Free Software Foundation; either 009 * version 3 of the License, or (at your option) any later version. 010 * 011 * Sonar is distributed in the hope that it will be useful, 012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 * Lesser General Public License for more details. 015 * 016 * You should have received a copy of the GNU Lesser General Public 017 * License along with Sonar; if not, write to the Free Software 018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02 019 */ 020 package org.sonar.api.utils; 021 022 import java.io.File; 023 import java.io.IOException; 024 025 public final class TempFileUtils { 026 027 private TempFileUtils() { 028 // only static methods 029 } 030 031 /** 032 * Create a temporary directory. This directory is NOT deleted when the JVM stops, because using File#deleteOnExit() 033 * is evil (google "deleteonExit evil"). Copied from http://stackoverflow.com/questions/617414/create-a-temporary-directory-in-java : 034 * <ol> 035 * <li>deleteOnExit() only deletes for normal JVM shutdowns, not crashes or killing the JVM process</li> 036 * <li>deleteOnExit() only deletes on JVM shutdown - not good for long running server processes because 3 :</li> 037 * <li>The most evil of all - deleteOnExit() consumes memory for each temp file entry. If your process is running for months, 038 * or creates a lot of temp files in a short time, you consume memory and never release it until the JVM 039 * shuts down.</li> 040 * </ol> 041 */ 042 public static File createTempDirectory() throws IOException { 043 return createTempDirectory("temp"); 044 } 045 046 public static File createTempDirectory(String prefix) throws IOException { 047 final File temp = File.createTempFile(prefix, Long.toString(System.nanoTime())); 048 if (!temp.delete()) { 049 throw new IOException("Could not delete temp file: " + temp.getAbsolutePath()); 050 } 051 052 if (!temp.mkdir()) { 053 throw new IOException("Could not create temp directory: " + temp.getAbsolutePath()); 054 } 055 return temp; 056 } 057 }