Coverage Report

Coverage Report - liquibase.util.SystemUtils

Classes in this File
Line Coverage
Branch Coverage
Complexity
SystemUtils
0/118
0/34
2.625
 /*
  * 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 liquibase.util;
 
 import java.io.File;
 
 /**
  * Code taken from <a href="http://commons.apache.org/lang">Commons lang utils</a>
  * <p>
  * Helpers for <code>java.lang.System</code>.
  * </p>
  * 
  * <p>
  * If a system property cannot be read due to security restrictions, the corresponding field in this class will be set
  * to <code>null</code> and a message will be written to <code>System.err</code>.
  * </p>
  * 
  * @author Apache Software Foundation
  * @author Based on code from Avalon Excalibur
  * @author Based on code from Lucene
  * @author <a href="mailto:sdowney@panix.com">Steve Downey</a>
  * @author Gary Gregory
  * @author Michael Becke
  * @author Tetsuya Kaneuchi
  * @author Rafal Krupinski
  * @author Jason Gritman
  * @since 1.0
  * @version $Id: SystemUtils.java 905707 2010-02-02 16:59:59Z niallp $
  */
 public class SystemUtils {
 
     /**
      * The prefix String for all Windows OS.
      */
     private static final String OS_NAME_WINDOWS_PREFIX = "Windows";
 
     // System property constants
     // -----------------------------------------------------------------------
     // These MUST be declared first. Other constants depend on this.
 
     /**
      * The System property key for the user home directory.
      */
     private static final String USER_HOME_KEY = "user.home";
 
     /**
      * The System property key for the user directory.
      */
     private static final String USER_DIR_KEY = "user.dir";
 
     /**
      * The System property key for the Java IO temporary directory.
      */
     private static final String JAVA_IO_TMPDIR_KEY = "java.io.tmpdir";
 
     /**
      * The System property key for the Java home directory.
      */
     private static final String JAVA_HOME_KEY = "java.home";
 
     /**
      * <p>
      * The <code>awt.toolkit</code> System Property.
      * </p>
      * <p>
      * Holds a class name, on Windows XP this is <code>sun.awt.windows.WToolkit</code>.
      * </p>
      * <p>
      * <b>On platforms without a GUI, this value is <code>null</code>.</b>
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since 2.1
      */
     public static final String AWT_TOOLKIT = getSystemProperty("awt.toolkit");
 
     /**
      * <p>
      * The <code>file.encoding</code> System Property.
      * </p>
      * <p>
      * File encoding, such as <code>Cp1252</code>.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since 2.0
      * @since Java 1.2
      */
     public static final String FILE_ENCODING = getSystemProperty("file.encoding");
 
     /**
      * <p>
      * The <code>file.separator</code> System Property. File separator (<code>&quot;/&quot;</code> on UNIX).
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.1
      */
     public static final String FILE_SEPARATOR = getSystemProperty("file.separator");
 
     /**
      * <p>
      * The <code>java.awt.fonts</code> System Property.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since 2.1
      */
     public static final String JAVA_AWT_FONTS = getSystemProperty("java.awt.fonts");
 
     /**
      * <p>
      * The <code>java.awt.graphicsenv</code> System Property.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since 2.1
      */
     public static final String JAVA_AWT_GRAPHICSENV = getSystemProperty("java.awt.graphicsenv");
 
     /**
      * <p>
      * The <code>java.awt.headless</code> System Property. The value of this property is the String <code>"true"</code>
      * or <code>"false"</code>.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @see #isJavaAwtHeadless()
      * @since 2.1
      * @since Java 1.4
      */
     public static final String JAVA_AWT_HEADLESS = getSystemProperty("java.awt.headless");
 
     /**
      * <p>
      * The <code>java.awt.printerjob</code> System Property.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since 2.1
      */
     public static final String JAVA_AWT_PRINTERJOB = getSystemProperty("java.awt.printerjob");
 
     /**
      * <p>
      * The <code>java.class.path</code> System Property. Java class path.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.1
      */
     public static final String JAVA_CLASS_PATH = getSystemProperty("java.class.path");
 
     /**
      * <p>
      * The <code>java.class.version</code> System Property. Java class format version number.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.1
      */
     public static final String JAVA_CLASS_VERSION = getSystemProperty("java.class.version");
 
     /**
      * <p>
      * The <code>java.compiler</code> System Property. Name of JIT compiler to use. First in JDK version 1.2. Not used
      * in Sun JDKs after 1.2.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.2. Not used in Sun versions after 1.2.
      */
     public static final String JAVA_COMPILER = getSystemProperty("java.compiler");
 
     /**
      * <p>
      * The <code>java.endorsed.dirs</code> System Property. Path of endorsed directory or directories.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.4
      */
     public static final String JAVA_ENDORSED_DIRS = getSystemProperty("java.endorsed.dirs");
 
     /**
      * <p>
      * The <code>java.ext.dirs</code> System Property. Path of extension directory or directories.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.3
      */
     public static final String JAVA_EXT_DIRS = getSystemProperty("java.ext.dirs");
 
     /**
      * <p>
      * The <code>java.home</code> System Property. Java installation directory.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.1
      */
     public static final String JAVA_HOME = getSystemProperty(JAVA_HOME_KEY);
 
     /**
      * <p>
      * The <code>java.io.tmpdir</code> System Property. Default temp file path.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.2
      */
     public static final String JAVA_IO_TMPDIR = getSystemProperty(JAVA_IO_TMPDIR_KEY);
 
     /**
      * <p>
      * The <code>java.library.path</code> System Property. List of paths to search when loading libraries.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.2
      */
     public static final String JAVA_LIBRARY_PATH = getSystemProperty("java.library.path");
 
     /**
      * <p>
      * The <code>java.runtime.name</code> System Property. Java Runtime Environment name.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since 2.0
      * @since Java 1.3
      */
     public static final String JAVA_RUNTIME_NAME = getSystemProperty("java.runtime.name");
 
     /**
      * <p>
      * The <code>java.runtime.version</code> System Property. Java Runtime Environment version.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since 2.0
      * @since Java 1.3
      */
     public static final String JAVA_RUNTIME_VERSION = getSystemProperty("java.runtime.version");
 
     /**
      * <p>
      * The <code>java.specification.name</code> System Property. Java Runtime Environment specification name.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.2
      */
     public static final String JAVA_SPECIFICATION_NAME = getSystemProperty("java.specification.name");
 
     /**
      * <p>
      * The <code>java.specification.vendor</code> System Property. Java Runtime Environment specification vendor.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.2
      */
     public static final String JAVA_SPECIFICATION_VENDOR = getSystemProperty("java.specification.vendor");
 
     /**
      * <p>
      * The <code>java.specification.version</code> System Property. Java Runtime Environment specification version.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.3
      */
     public static final String JAVA_SPECIFICATION_VERSION = getSystemProperty("java.specification.version");
 
     /**
      * <p>
      * The <code>java.util.prefs.PreferencesFactory</code> System Property. A class name.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since 2.1
      * @since Java 1.4
      */
     public static final String JAVA_UTIL_PREFS_PREFERENCES_FACTORY = getSystemProperty("java.util.prefs.PreferencesFactory");
 
     /**
      * <p>
      * The <code>java.vendor</code> System Property. Java vendor-specific string.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.1
      */
     public static final String JAVA_VENDOR = getSystemProperty("java.vendor");
 
     /**
      * <p>
      * The <code>java.vendor.url</code> System Property. Java vendor URL.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.1
      */
     public static final String JAVA_VENDOR_URL = getSystemProperty("java.vendor.url");
 
     /**
      * <p>
      * The <code>java.version</code> System Property. Java version number.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.1
      */
     public static final String JAVA_VERSION = getSystemProperty("java.version");
 
     /**
      * <p>
      * The <code>java.vm.info</code> System Property. Java Virtual Machine implementation info.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since 2.0
      * @since Java 1.2
      */
     public static final String JAVA_VM_INFO = getSystemProperty("java.vm.info");
 
     /**
      * <p>
      * The <code>java.vm.name</code> System Property. Java Virtual Machine implementation name.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.2
      */
     public static final String JAVA_VM_NAME = getSystemProperty("java.vm.name");
 
     /**
      * <p>
      * The <code>java.vm.specification.name</code> System Property. Java Virtual Machine specification name.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.2
      */
     public static final String JAVA_VM_SPECIFICATION_NAME = getSystemProperty("java.vm.specification.name");
 
     /**
      * <p>
      * The <code>java.vm.specification.vendor</code> System Property. Java Virtual Machine specification vendor.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.2
      */
     public static final String JAVA_VM_SPECIFICATION_VENDOR = getSystemProperty("java.vm.specification.vendor");
 
     /**
      * <p>
      * The <code>java.vm.specification.version</code> System Property. Java Virtual Machine specification version.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.2
      */
     public static final String JAVA_VM_SPECIFICATION_VERSION = getSystemProperty("java.vm.specification.version");
 
     /**
      * <p>
      * The <code>java.vm.vendor</code> System Property. Java Virtual Machine implementation vendor.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.2
      */
     public static final String JAVA_VM_VENDOR = getSystemProperty("java.vm.vendor");
 
     /**
      * <p>
      * The <code>java.vm.version</code> System Property. Java Virtual Machine implementation version.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.2
      */
     public static final String JAVA_VM_VERSION = getSystemProperty("java.vm.version");
 
     /**
      * <p>
      * The <code>line.separator</code> System Property. Line separator (<code>&quot;\n&quot;</code> on UNIX).
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.1
      */
     public static final String LINE_SEPARATOR = getSystemProperty("line.separator");
 
     /**
      * <p>
      * The <code>os.arch</code> System Property. Operating system architecture.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.1
      */
     public static final String OS_ARCH = getSystemProperty("os.arch");
 
     /**
      * <p>
      * The <code>os.name</code> System Property. Operating system name.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.1
      */
     public static final String OS_NAME = getSystemProperty("os.name");
 
     /**
      * <p>
      * The <code>os.version</code> System Property. Operating system version.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.1
      */
     public static final String OS_VERSION = getSystemProperty("os.version");
 
     /**
      * <p>
      * The <code>path.separator</code> System Property. Path separator (<code>&quot;:&quot;</code> on UNIX).
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.1
      */
     public static final String PATH_SEPARATOR = getSystemProperty("path.separator");
 
     /**
      * <p>
      * The <code>user.country</code> or <code>user.region</code> System Property. User's country code, such as
      * <code>GB</code>. First in JDK version 1.2 as <code>user.region</code>. Renamed to <code>user.country</code> in
      * 1.4
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since 2.0
      * @since Java 1.2
      */
     public static final String USER_COUNTRY = getSystemProperty("user.country") == null ? getSystemProperty("user.region")
             : getSystemProperty("user.country");
 
     /**
      * <p>
      * The <code>user.dir</code> System Property. User's current working directory.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.1
      */
     public static final String USER_DIR = getSystemProperty(USER_DIR_KEY);
 
     /**
      * <p>
      * The <code>user.home</code> System Property. User's home directory.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.1
      */
     public static final String USER_HOME = getSystemProperty(USER_HOME_KEY);
 
     /**
      * <p>
      * The <code>user.language</code> System Property. User's language code, such as <code>"en"</code>.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since 2.0
      * @since Java 1.2
      */
     public static final String USER_LANGUAGE = getSystemProperty("user.language");
 
     /**
      * <p>
      * The <code>user.name</code> System Property. User's account name.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since Java 1.1
      */
     public static final String USER_NAME = getSystemProperty("user.name");
 
     /**
      * <p>
      * The <code>user.timezone</code> System Property. For example: <code>"America/Los_Angeles"</code>.
      * </p>
      * 
      * <p>
      * Defaults to <code>null</code> if the runtime does not have security access to read this property or the property
      * does not exist.
      * </p>
      * 
      * <p>
      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
      * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of
      * sync with that System property.
      * </p>
      * 
      * @since 2.1
      */
     public static final String USER_TIMEZONE = getSystemProperty("user.timezone");
 
     // Java version
     // -----------------------------------------------------------------------
     // This MUST be declared after those above as it depends on the
     // values being set up
 
     /**
      * <p>
      * Gets the Java version as a <code>String</code> trimming leading letters.
      * </p>
      * 
      * <p>
      * The field will return <code>null</code> if {@link #JAVA_VERSION} is <code>null</code>.
      * </p>
      * 
      * @since 2.1
      */
     public static final String JAVA_VERSION_TRIMMED = getJavaVersionTrimmed();
 
     // Java version values
     // -----------------------------------------------------------------------
     // These MUST be declared after the trim above as they depend on the
     // value being set up
 
     /**
      * <p>
      * Gets the Java version as a <code>float</code>.
      * </p>
      * 
      * <p>
      * Example return values:
      * </p>
      * <ul>
      * <li><code>1.2f</code> for JDK 1.2
      * <li><code>1.31f</code> for JDK 1.3.1
      * </ul>
      * 
      * <p>
      * The field will return zero if {@link #JAVA_VERSION} is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final float JAVA_VERSION_FLOAT = getJavaVersionAsFloat();
 
     /**
      * <p>
      * Gets the Java version as an <code>int</code>.
      * </p>
      * 
      * <p>
      * Example return values:
      * </p>
      * <ul>
      * <li><code>120</code> for JDK 1.2
      * <li><code>131</code> for JDK 1.3.1
      * </ul>
      * 
      * <p>
      * The field will return zero if {@link #JAVA_VERSION} is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final int JAVA_VERSION_INT = getJavaVersionAsInt();
 
     // Java version checks
     // -----------------------------------------------------------------------
     // These MUST be declared after those above as they depend on the
     // values being set up
 
     /**
      * <p>
      * Is <code>true</code> if this is Java version 1.1 (also 1.1.x versions).
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if {@link #JAVA_VERSION} is <code>null</code>.
      * </p>
      */
     public static final boolean IS_JAVA_1_1 = getJavaVersionMatches("1.1");
 
     /**
      * <p>
      * Is <code>true</code> if this is Java version 1.2 (also 1.2.x versions).
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if {@link #JAVA_VERSION} is <code>null</code>.
      * </p>
      */
     public static final boolean IS_JAVA_1_2 = getJavaVersionMatches("1.2");
 
     /**
      * <p>
      * Is <code>true</code> if this is Java version 1.3 (also 1.3.x versions).
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if {@link #JAVA_VERSION} is <code>null</code>.
      * </p>
      */
     public static final boolean IS_JAVA_1_3 = getJavaVersionMatches("1.3");
 
     /**
      * <p>
      * Is <code>true</code> if this is Java version 1.4 (also 1.4.x versions).
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if {@link #JAVA_VERSION} is <code>null</code>.
      * </p>
      */
     public static final boolean IS_JAVA_1_4 = getJavaVersionMatches("1.4");
 
     /**
      * <p>
      * Is <code>true</code> if this is Java version 1.5 (also 1.5.x versions).
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if {@link #JAVA_VERSION} is <code>null</code>.
      * </p>
      */
     public static final boolean IS_JAVA_1_5 = getJavaVersionMatches("1.5");
 
     /**
      * <p>
      * Is <code>true</code> if this is Java version 1.6 (also 1.6.x versions).
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if {@link #JAVA_VERSION} is <code>null</code>.
      * </p>
      */
     public static final boolean IS_JAVA_1_6 = getJavaVersionMatches("1.6");
 
     /**
      * <p>
      * Is <code>true</code> if this is Java version 1.7 (also 1.7.x versions).
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if {@link #JAVA_VERSION} is <code>null</code>.
      * </p>
      * 
      * @since 2.5
      */
     public static final boolean IS_JAVA_1_7 = getJavaVersionMatches("1.7");
 
     // Operating system checks
     // -----------------------------------------------------------------------
     // These MUST be declared after those above as they depend on the
     // values being set up
     // OS names from http://www.vamphq.com/os.html
     // Selected ones included - please advise dev@commons.apache.org
     // if you want another added or a mistake corrected
 
     /**
      * <p>
      * Is <code>true</code> if this is AIX.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final boolean IS_OS_AIX = getOSMatches("AIX");
 
     /**
      * <p>
      * Is <code>true</code> if this is HP-UX.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final boolean IS_OS_HP_UX = getOSMatches("HP-UX");
 
     /**
      * <p>
      * Is <code>true</code> if this is Irix.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final boolean IS_OS_IRIX = getOSMatches("Irix");
 
     /**
      * <p>
      * Is <code>true</code> if this is Linux.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final boolean IS_OS_LINUX = getOSMatches("Linux") || getOSMatches("LINUX");
 
     /**
      * <p>
      * Is <code>true</code> if this is Mac.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final boolean IS_OS_MAC = getOSMatches("Mac");
 
     /**
      * <p>
      * Is <code>true</code> if this is Mac.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final boolean IS_OS_MAC_OSX = getOSMatches("Mac OS X");
 
     /**
      * <p>
      * Is <code>true</code> if this is OS/2.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final boolean IS_OS_OS2 = getOSMatches("OS/2");
 
     /**
      * <p>
      * Is <code>true</code> if this is Solaris.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final boolean IS_OS_SOLARIS = getOSMatches("Solaris");
 
     /**
      * <p>
      * Is <code>true</code> if this is SunOS.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final boolean IS_OS_SUN_OS = getOSMatches("SunOS");
 
     /**
      * <p>
      * Is <code>true</code> if this is a POSIX compilant system, as in any of AIX, HP-UX, Irix, Linux, MacOSX, Solaris
      * or SUN OS.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.1
      */
     public static final boolean IS_OS_UNIX = IS_OS_AIX || IS_OS_HP_UX || IS_OS_IRIX || IS_OS_LINUX || IS_OS_MAC_OSX
             || IS_OS_SOLARIS || IS_OS_SUN_OS;
 
     /**
      * <p>
      * Is <code>true</code> if this is Windows.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final boolean IS_OS_WINDOWS = getOSMatches(OS_NAME_WINDOWS_PREFIX);
 
     /**
      * <p>
      * Is <code>true</code> if this is Windows 2000.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final boolean IS_OS_WINDOWS_2000 = getOSMatches(OS_NAME_WINDOWS_PREFIX, "5.0");
 
     /**
      * <p>
      * Is <code>true</code> if this is Windows 95.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final boolean IS_OS_WINDOWS_95 = getOSMatches(OS_NAME_WINDOWS_PREFIX + " 9", "4.0");
     // JDK 1.2 running on Windows98 returns 'Windows 95', hence the above
 
     /**
      * <p>
      * Is <code>true</code> if this is Windows 98.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final boolean IS_OS_WINDOWS_98 = getOSMatches(OS_NAME_WINDOWS_PREFIX + " 9", "4.1");
     // JDK 1.2 running on Windows98 returns 'Windows 95', hence the above
 
     /**
      * <p>
      * Is <code>true</code> if this is Windows ME.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final boolean IS_OS_WINDOWS_ME = getOSMatches(OS_NAME_WINDOWS_PREFIX, "4.9");
     // JDK 1.2 running on WindowsME may return 'Windows 95', hence the above
 
     /**
      * <p>
      * Is <code>true</code> if this is Windows NT.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final boolean IS_OS_WINDOWS_NT = getOSMatches(OS_NAME_WINDOWS_PREFIX + " NT");
     // Windows 2000 returns 'Windows 2000' but may suffer from same JDK1.2 problem
 
     /**
      * <p>
      * Is <code>true</code> if this is Windows XP.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.0
      */
     public static final boolean IS_OS_WINDOWS_XP = getOSMatches(OS_NAME_WINDOWS_PREFIX, "5.1");
 
     // -----------------------------------------------------------------------
     /**
      * <p>
      * Is <code>true</code> if this is Windows Vista.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.4
      */
     public static final boolean IS_OS_WINDOWS_VISTA = getOSMatches(OS_NAME_WINDOWS_PREFIX, "6.0");
 
     /**
      * <p>
      * Is <code>true</code> if this is Windows 7.
      * </p>
      * 
      * <p>
      * The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
      * </p>
      * 
      * @since 2.5
      */
     public static final boolean IS_OS_WINDOWS_7 = getOSMatches(OS_NAME_WINDOWS_PREFIX, "6.1");
 
     // -----------------------------------------------------------------------
     /**
      * <p>
      * SystemUtils instances should NOT be constructed in standard programming. Instead, the class should be used as
      * <code>SystemUtils.FILE_SEPARATOR</code>.
      * </p>
      * 
      * <p>
      * This constructor is public to permit tools that require a JavaBean instance to operate.
      * </p>
      */
     public SystemUtils() {
         super();
     }
 
     // -----------------------------------------------------------------------
     /**
      * <p>
      * Gets the Java version number as a <code>float</code>.
      * </p>
      * 
      * <p>
      * Example return values:
      * </p>
      * <ul>
      * <li><code>1.2f</code> for JDK 1.2
      * <li><code>1.31f</code> for JDK 1.3.1
      * </ul>
      * 
      * @return the version, for example 1.31f for JDK 1.3.1
      * @deprecated Use {@link #JAVA_VERSION_FLOAT} instead. Method will be removed in Commons Lang 3.0.
      */
     @Deprecated
     public static float getJavaVersion() {
         return JAVA_VERSION_FLOAT;
     }
 
     /**
      * <p>
      * Gets the Java version number as a <code>float</code>.
      * </p>
      * 
      * <p>
      * Example return values:
      * </p>
      * <ul>
      * <li><code>1.2f</code> for JDK 1.2
      * <li><code>1.31f</code> for JDK 1.3.1
      * </ul>
      * 
      * <p>
      * Patch releases are not reported. Zero is returned if {@link #JAVA_VERSION_TRIMMED} is <code>null</code>.
      * </p>
      * 
      * @return the version, for example 1.31f for JDK 1.3.1
      */
     private static float getJavaVersionAsFloat() {
         if (JAVA_VERSION_TRIMMED == null) {
             return 0f;
         }
         String str = JAVA_VERSION_TRIMMED.substring(0, 3);
         if (JAVA_VERSION_TRIMMED.length() >= 5) {
             str = str + JAVA_VERSION_TRIMMED.substring(4, 5);
         }
         try {
             return Float.parseFloat(str);
         } catch (Exception ex) {
             return 0;
         }
     }
 
     /**
      * <p>
      * Gets the Java version number as an <code>int</code>.
      * </p>
      * 
      * <p>
      * Example return values:
      * </p>
      * <ul>
      * <li><code>120</code> for JDK 1.2
      * <li><code>131</code> for JDK 1.3.1
      * </ul>
      * 
      * <p>
      * Patch releases are not reported. Zero is returned if {@link #JAVA_VERSION_TRIMMED} is <code>null</code>.
      * </p>
      * 
      * @return the version, for example 131 for JDK 1.3.1
      */
     private static int getJavaVersionAsInt() {
         if (JAVA_VERSION_TRIMMED == null) {
             return 0;
         }
         String str = JAVA_VERSION_TRIMMED.substring(0, 1);
         str = str + JAVA_VERSION_TRIMMED.substring(2, 3);
         if (JAVA_VERSION_TRIMMED.length() >= 5) {
             str = str + JAVA_VERSION_TRIMMED.substring(4, 5);
         } else {
             str = str + "0";
         }
         try {
             return Integer.parseInt(str);
         } catch (Exception ex) {
             return 0;
         }
     }
 
     /**
      * Trims the text of the java version to start with numbers.
      * 
      * @return the trimmed java version
      */
     private static String getJavaVersionTrimmed() {
         if (JAVA_VERSION != null) {
             for (int i = 0; i < JAVA_VERSION.length(); i++) {
                 char ch = JAVA_VERSION.charAt(i);
                 if (ch >= '0' && ch <= '9') {
                     return JAVA_VERSION.substring(i);
                 }
             }
         }
         return null;
     }
 
     /**
      * <p>
      * Decides if the java version matches.
      * </p>
      * 
      * @param versionPrefix
      *            the prefix for the java version
      * @return true if matches, or false if not or can't determine
      */
     private static boolean getJavaVersionMatches(String versionPrefix) {
         if (JAVA_VERSION_TRIMMED == null) {
             return false;
         }
         return JAVA_VERSION_TRIMMED.startsWith(versionPrefix);
     }
 
     /**
      * <p>
      * Decides if the operating system matches.
      * </p>
      * 
      * @param osNamePrefix
      *            the prefix for the os name
      * @return true if matches, or false if not or can't determine
      */
     private static boolean getOSMatches(String osNamePrefix) {
         if (OS_NAME == null) {
             return false;
         }
         return OS_NAME.startsWith(osNamePrefix);
     }
 
     /**
      * <p>
      * Decides if the operating system matches.
      * </p>
      * 
      * @param osNamePrefix
      *            the prefix for the os name
      * @param osVersionPrefix
      *            the prefix for the version
      * @return true if matches, or false if not or can't determine
      */
     private static boolean getOSMatches(String osNamePrefix, String osVersionPrefix) {
         if (OS_NAME == null || OS_VERSION == null) {
             return false;
         }
         return OS_NAME.startsWith(osNamePrefix) && OS_VERSION.startsWith(osVersionPrefix);
     }
 
     // -----------------------------------------------------------------------
     /**
      * <p>
      * Gets a System property, defaulting to <code>null</code> if the property cannot be read.
      * </p>
      * 
      * <p>
      * If a <code>SecurityException</code> is caught, the return value is <code>null</code> and a message is written to
      * <code>System.err</code>.
      * </p>
      * 
      * @param property
      *            the system property name
      * @return the system property value or <code>null</code> if a security problem occurs
      */
     private static String getSystemProperty(String property) {
         try {
             return System.getProperty(property);
         } catch (SecurityException ex) {
             // we are not allowed to look at this property
             System.err.println("Caught a SecurityException reading the system property '" + property
                     + "'; the SystemUtils property value will default to null.");
             return null;
         }
     }
 
     /**
      * <p>
      * Is the Java version at least the requested version.
      * </p>
      * 
      * <p>
      * Example input:
      * </p>
      * <ul>
      * <li><code>1.2f</code> to test for JDK 1.2</li>
      * <li><code>1.31f</code> to test for JDK 1.3.1</li>
      * </ul>
      * 
      * @param requiredVersion
      *            the required version, for example 1.31f
      * @return <code>true</code> if the actual version is equal or greater than the required version
      */
     public static boolean isJavaVersionAtLeast(float requiredVersion) {
         return JAVA_VERSION_FLOAT >= requiredVersion;
     }
 
     /**
      * <p>
      * Is the Java version at least the requested version.
      * </p>
      * 
      * <p>
      * Example input:
      * </p>
      * <ul>
      * <li><code>120</code> to test for JDK 1.2 or greater</li>
      * <li><code>131</code> to test for JDK 1.3.1 or greater</li>
      * </ul>
      * 
      * @param requiredVersion
      *            the required version, for example 131
      * @return <code>true</code> if the actual version is equal or greater than the required version
      * @since 2.0
      */
     public static boolean isJavaVersionAtLeast(int requiredVersion) {
         return JAVA_VERSION_INT >= requiredVersion;
     }
 
     /**
      * Returns whether the {@link #JAVA_AWT_HEADLESS} value is <code>true</code>.
      * 
      * @return <code>true</code> if <code>JAVA_AWT_HEADLESS</code> is <code>"true"</code>, <code>false</code> otherwise.
      * 
      * @see #JAVA_AWT_HEADLESS
      * @since 2.1
      * @since Java 1.4
      */
     public static boolean isJavaAwtHeadless() {
         return JAVA_AWT_HEADLESS != null ? JAVA_AWT_HEADLESS.equals(Boolean.TRUE.toString()) : false;
     }
 
     /**
      * <p>
      * Gets the Java home directory as a <code>File</code>.
      * </p>
      * 
      * @return a directory
      * @throws SecurityException
      *             if a security manager exists and its <code>checkPropertyAccess</code> method doesn't allow access to
      *             the specified system property.
      * @see System#getProperty(String)
      * @since 2.1
      */
     public static File getJavaHome() {
         return new File(System.getProperty(JAVA_HOME_KEY));
     }
 
     /**
      * <p>
      * Gets the Java IO temporary directory as a <code>File</code>.
      * </p>
      * 
      * @return a directory
      * @throws SecurityException
      *             if a security manager exists and its <code>checkPropertyAccess</code> method doesn't allow access to
      *             the specified system property.
      * @see System#getProperty(String)
      * @since 2.1
      */
     public static File getJavaIoTmpDir() {
         return new File(System.getProperty(JAVA_IO_TMPDIR_KEY));
     }
 
     /**
      * <p>
      * Gets the user directory as a <code>File</code>.
      * </p>
      * 
      * @return a directory
      * @throws SecurityException
      *             if a security manager exists and its <code>checkPropertyAccess</code> method doesn't allow access to
      *             the specified system property.
      * @see System#getProperty(String)
      * @since 2.1
      */
     public static File getUserDir() {
         return new File(System.getProperty(USER_DIR_KEY));
     }
 
     /**
      * <p>
      * Gets the user home directory as a <code>File</code>.
      * </p>
      * 
      * @return a directory
      * @throws SecurityException
      *             if a security manager exists and its <code>checkPropertyAccess</code> method doesn't allow access to
      *             the specified system property.
      * @see System#getProperty(String)
      * @since 2.1
      */
     public static File getUserHome() {
         return new File(System.getProperty(USER_HOME_KEY));
     }
 
 }