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/*
* 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.commons.lang3;
import java.io.File;
/**
*
* Helpers for {@code java.lang.System}.
*
*
* If a system property cannot be read due to security restrictions, the corresponding field in this class will be set
* to {@code null} and a message will be written to {@code System.err}.
*
*
* #ThreadSafe#
*
*
* @since 1.0
* @version $Id: SystemUtils.java 1436770 2013-01-22 07:09:45Z ggregory $
*/
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";
/**
*
* The {@code awt.toolkit} System Property.
*
*
* Holds a class name, on Windows XP this is {@code sun.awt.windows.WToolkit}.
*
*
* On platforms without a GUI, this value is {@code null}.
*
*
* Defaults to {@code null} if the runtime does not have security access to read this property or the property does
* not exist.
*
*
* 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.
*
*
* @since 2.1
*/
public static final String AWT_TOOLKIT = getSystemProperty("awt.toolkit");
/**
*
* The {@code file.encoding} System Property.
*
*
* File encoding, such as {@code Cp1252}.
*
*
* Defaults to {@code null} if the runtime does not have security access to read this property or the property does
* not exist.
*
*
* 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.
*
*
* @since 2.0
* @since Java 1.2
*/
public static final String FILE_ENCODING = getSystemProperty("file.encoding");
/**
*
* The {@code file.separator} System Property.
* The file separator is:
*
* - {@code "/"}
on UNIX
* * Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.1 */ public static final String FILE_SEPARATOR = getSystemProperty("file.separator"); /** ** The {@code java.awt.fonts} System Property. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since 2.1 */ public static final String JAVA_AWT_FONTS = getSystemProperty("java.awt.fonts"); /** ** The {@code java.awt.graphicsenv} System Property. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since 2.1 */ public static final String JAVA_AWT_GRAPHICSENV = getSystemProperty("java.awt.graphicsenv"); /** ** The {@code java.awt.headless} System Property. The value of this property is the String {@code "true"} or * {@code "false"}. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @see #isJavaAwtHeadless() * @since 2.1 * @since Java 1.4 */ public static final String JAVA_AWT_HEADLESS = getSystemProperty("java.awt.headless"); /** ** The {@code java.awt.printerjob} System Property. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since 2.1 */ public static final String JAVA_AWT_PRINTERJOB = getSystemProperty("java.awt.printerjob"); /** ** The {@code java.class.path} System Property. Java class path. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.1 */ public static final String JAVA_CLASS_PATH = getSystemProperty("java.class.path"); /** ** The {@code java.class.version} System Property. Java class format version number. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.1 */ public static final String JAVA_CLASS_VERSION = getSystemProperty("java.class.version"); /** ** The {@code java.compiler} System Property. Name of JIT compiler to use. First in JDK version 1.2. Not used in Sun * JDKs after 1.2. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.2. Not used in Sun versions after 1.2. */ public static final String JAVA_COMPILER = getSystemProperty("java.compiler"); /** ** The {@code java.endorsed.dirs} System Property. Path of endorsed directory or directories. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.4 */ public static final String JAVA_ENDORSED_DIRS = getSystemProperty("java.endorsed.dirs"); /** ** The {@code java.ext.dirs} System Property. Path of extension directory or directories. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.3 */ public static final String JAVA_EXT_DIRS = getSystemProperty("java.ext.dirs"); /** ** The {@code java.home} System Property. Java installation directory. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.1 */ public static final String JAVA_HOME = getSystemProperty(JAVA_HOME_KEY); /** ** The {@code java.io.tmpdir} System Property. Default temp file path. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.2 */ public static final String JAVA_IO_TMPDIR = getSystemProperty(JAVA_IO_TMPDIR_KEY); /** ** The {@code java.library.path} System Property. List of paths to search when loading libraries. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.2 */ public static final String JAVA_LIBRARY_PATH = getSystemProperty("java.library.path"); /** ** The {@code java.runtime.name} System Property. Java Runtime Environment name. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since 2.0 * @since Java 1.3 */ public static final String JAVA_RUNTIME_NAME = getSystemProperty("java.runtime.name"); /** ** The {@code java.runtime.version} System Property. Java Runtime Environment version. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since 2.0 * @since Java 1.3 */ public static final String JAVA_RUNTIME_VERSION = getSystemProperty("java.runtime.version"); /** ** The {@code java.specification.name} System Property. Java Runtime Environment specification name. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.2 */ public static final String JAVA_SPECIFICATION_NAME = getSystemProperty("java.specification.name"); /** ** The {@code java.specification.vendor} System Property. Java Runtime Environment specification vendor. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.2 */ public static final String JAVA_SPECIFICATION_VENDOR = getSystemProperty("java.specification.vendor"); /** ** The {@code java.specification.version} System Property. Java Runtime Environment specification version. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.3 */ public static final String JAVA_SPECIFICATION_VERSION = getSystemProperty("java.specification.version"); private static final JavaVersion JAVA_SPECIFICATION_VERSION_AS_ENUM = JavaVersion.get(JAVA_SPECIFICATION_VERSION); /** ** The {@code java.util.prefs.PreferencesFactory} System Property. A class name. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since 2.1 * @since Java 1.4 */ public static final String JAVA_UTIL_PREFS_PREFERENCES_FACTORY = getSystemProperty("java.util.prefs.PreferencesFactory"); /** ** The {@code java.vendor} System Property. Java vendor-specific string. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.1 */ public static final String JAVA_VENDOR = getSystemProperty("java.vendor"); /** ** The {@code java.vendor.url} System Property. Java vendor URL. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.1 */ public static final String JAVA_VENDOR_URL = getSystemProperty("java.vendor.url"); /** ** The {@code java.version} System Property. Java version number. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.1 */ public static final String JAVA_VERSION = getSystemProperty("java.version"); /** ** The {@code java.vm.info} System Property. Java Virtual Machine implementation info. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since 2.0 * @since Java 1.2 */ public static final String JAVA_VM_INFO = getSystemProperty("java.vm.info"); /** ** The {@code java.vm.name} System Property. Java Virtual Machine implementation name. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.2 */ public static final String JAVA_VM_NAME = getSystemProperty("java.vm.name"); /** ** The {@code java.vm.specification.name} System Property. Java Virtual Machine specification name. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.2 */ public static final String JAVA_VM_SPECIFICATION_NAME = getSystemProperty("java.vm.specification.name"); /** ** The {@code java.vm.specification.vendor} System Property. Java Virtual Machine specification vendor. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.2 */ public static final String JAVA_VM_SPECIFICATION_VENDOR = getSystemProperty("java.vm.specification.vendor"); /** ** The {@code java.vm.specification.version} System Property. Java Virtual Machine specification version. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.2 */ public static final String JAVA_VM_SPECIFICATION_VERSION = getSystemProperty("java.vm.specification.version"); /** ** The {@code java.vm.vendor} System Property. Java Virtual Machine implementation vendor. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.2 */ public static final String JAVA_VM_VENDOR = getSystemProperty("java.vm.vendor"); /** ** The {@code java.vm.version} System Property. Java Virtual Machine implementation version. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.2 */ public static final String JAVA_VM_VERSION = getSystemProperty("java.vm.version"); /** *
* The {@code line.separator} System Property. Line separator ("\n" on UNIX).
*
* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.1 */ public static final String LINE_SEPARATOR = getSystemProperty("line.separator"); /** ** The {@code os.arch} System Property. Operating system architecture. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.1 */ public static final String OS_ARCH = getSystemProperty("os.arch"); /** ** The {@code os.name} System Property. Operating system name. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.1 */ public static final String OS_NAME = getSystemProperty("os.name"); /** ** The {@code os.version} System Property. Operating system version. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.1 */ public static final String OS_VERSION = getSystemProperty("os.version"); /** *
* The {@code path.separator} System Property. Path separator (":" on UNIX).
*
* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.1 */ public static final String PATH_SEPARATOR = getSystemProperty("path.separator"); /** ** The {@code user.country} or {@code user.region} System Property. User's country code, such as {@code GB}. First * in Java version 1.2 as {@code user.region}. Renamed to {@code user.country} in 1.4 *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since 2.0 * @since Java 1.2 */ public static final String USER_COUNTRY = getSystemProperty("user.country") == null ? getSystemProperty("user.region") : getSystemProperty("user.country"); /** ** The {@code user.dir} System Property. User's current working directory. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.1 */ public static final String USER_DIR = getSystemProperty(USER_DIR_KEY); /** ** The {@code user.home} System Property. User's home directory. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.1 */ public static final String USER_HOME = getSystemProperty(USER_HOME_KEY); /** ** The {@code user.language} System Property. User's language code, such as {@code "en"}. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since 2.0 * @since Java 1.2 */ public static final String USER_LANGUAGE = getSystemProperty("user.language"); /** ** The {@code user.name} System Property. User's account name. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since Java 1.1 */ public static final String USER_NAME = getSystemProperty("user.name"); /** ** The {@code user.timezone} System Property. For example: {@code "America/Los_Angeles"}. *
** Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *
** 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. *
* * @since 2.1 */ public static final String USER_TIMEZONE = getSystemProperty("user.timezone"); // Java version checks // ----------------------------------------------------------------------- // These MUST be declared after those above as they depend on the // values being set up /** ** Is {@code true} if this is Java version 1.1 (also 1.1.x versions). *
** The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *
*/ public static final boolean IS_JAVA_1_1 = getJavaVersionMatches("1.1"); /** ** Is {@code true} if this is Java version 1.2 (also 1.2.x versions). *
** The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *
*/ public static final boolean IS_JAVA_1_2 = getJavaVersionMatches("1.2"); /** ** Is {@code true} if this is Java version 1.3 (also 1.3.x versions). *
** The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *
*/ public static final boolean IS_JAVA_1_3 = getJavaVersionMatches("1.3"); /** ** Is {@code true} if this is Java version 1.4 (also 1.4.x versions). *
** The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *
*/ public static final boolean IS_JAVA_1_4 = getJavaVersionMatches("1.4"); /** ** Is {@code true} if this is Java version 1.5 (also 1.5.x versions). *
** The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *
*/ public static final boolean IS_JAVA_1_5 = getJavaVersionMatches("1.5"); /** ** Is {@code true} if this is Java version 1.6 (also 1.6.x versions). *
** The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *
*/ public static final boolean IS_JAVA_1_6 = getJavaVersionMatches("1.6"); /** ** Is {@code true} if this is Java version 1.7 (also 1.7.x versions). *
** The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *
* * @since 3.0 */ 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 [email protected] // if you want another added or a mistake corrected /** ** Is {@code true} if this is AIX. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 2.0 */ public static final boolean IS_OS_AIX = getOSMatchesName("AIX"); /** ** Is {@code true} if this is HP-UX. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 2.0 */ public static final boolean IS_OS_HP_UX = getOSMatchesName("HP-UX"); /** ** Is {@code true} if this is Irix. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 2.0 */ public static final boolean IS_OS_IRIX = getOSMatchesName("Irix"); /** ** Is {@code true} if this is Linux. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 2.0 */ public static final boolean IS_OS_LINUX = getOSMatchesName("Linux") || getOSMatchesName("LINUX"); /** ** Is {@code true} if this is Mac. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 2.0 */ public static final boolean IS_OS_MAC = getOSMatchesName("Mac"); /** ** Is {@code true} if this is Mac. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 2.0 */ public static final boolean IS_OS_MAC_OSX = getOSMatchesName("Mac OS X"); /** ** Is {@code true} if this is FreeBSD. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 3.1 */ public static final boolean IS_OS_FREE_BSD = getOSMatchesName("FreeBSD"); /** ** Is {@code true} if this is OpenBSD. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 3.1 */ public static final boolean IS_OS_OPEN_BSD = getOSMatchesName("OpenBSD"); /** ** Is {@code true} if this is NetBSD. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 3.1 */ public static final boolean IS_OS_NET_BSD = getOSMatchesName("NetBSD"); /** ** Is {@code true} if this is OS/2. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 2.0 */ public static final boolean IS_OS_OS2 = getOSMatchesName("OS/2"); /** ** Is {@code true} if this is Solaris. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 2.0 */ public static final boolean IS_OS_SOLARIS = getOSMatchesName("Solaris"); /** ** Is {@code true} if this is SunOS. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 2.0 */ public static final boolean IS_OS_SUN_OS = getOSMatchesName("SunOS"); /** ** Is {@code true} if this is a UNIX like system, as in any of AIX, HP-UX, Irix, Linux, MacOSX, Solaris or SUN OS. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @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 || IS_OS_FREE_BSD || IS_OS_OPEN_BSD || IS_OS_NET_BSD; /** ** Is {@code true} if this is Windows. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 2.0 */ public static final boolean IS_OS_WINDOWS = getOSMatchesName(OS_NAME_WINDOWS_PREFIX); /** ** Is {@code true} if this is Windows 2000. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 2.0 */ public static final boolean IS_OS_WINDOWS_2000 = getOSMatches(OS_NAME_WINDOWS_PREFIX, "5.0"); /** ** Is {@code true} if this is Windows 2003. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 3.1 */ public static final boolean IS_OS_WINDOWS_2003 = getOSMatches(OS_NAME_WINDOWS_PREFIX, "5.2"); /** ** Is {@code true} if this is Windows 2008. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 3.1 */ public static final boolean IS_OS_WINDOWS_2008 = getOSMatches(OS_NAME_WINDOWS_PREFIX + " Server 2008", "6.1"); /** ** Is {@code true} if this is Windows 95. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 2.0 */ public static final boolean IS_OS_WINDOWS_95 = getOSMatches(OS_NAME_WINDOWS_PREFIX + " 9", "4.0"); // Java 1.2 running on Windows98 returns 'Windows 95', hence the above /** ** Is {@code true} if this is Windows 98. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 2.0 */ public static final boolean IS_OS_WINDOWS_98 = getOSMatches(OS_NAME_WINDOWS_PREFIX + " 9", "4.1"); // Java 1.2 running on Windows98 returns 'Windows 95', hence the above /** ** Is {@code true} if this is Windows ME. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 2.0 */ public static final boolean IS_OS_WINDOWS_ME = getOSMatches(OS_NAME_WINDOWS_PREFIX, "4.9"); // Java 1.2 running on WindowsME may return 'Windows 95', hence the above /** ** Is {@code true} if this is Windows NT. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 2.0 */ public static final boolean IS_OS_WINDOWS_NT = getOSMatchesName(OS_NAME_WINDOWS_PREFIX + " NT"); // Windows 2000 returns 'Windows 2000' but may suffer from same Java1.2 problem /** ** Is {@code true} if this is Windows XP. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 2.0 */ public static final boolean IS_OS_WINDOWS_XP = getOSMatches(OS_NAME_WINDOWS_PREFIX, "5.1"); // ----------------------------------------------------------------------- /** ** Is {@code true} if this is Windows Vista. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 2.4 */ public static final boolean IS_OS_WINDOWS_VISTA = getOSMatches(OS_NAME_WINDOWS_PREFIX, "6.0"); /** ** Is {@code true} if this is Windows 7. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 3.0 */ public static final boolean IS_OS_WINDOWS_7 = getOSMatches(OS_NAME_WINDOWS_PREFIX, "6.1"); /** ** Is {@code true} if this is Windows 8. *
** The field will return {@code false} if {@code OS_NAME} is {@code null}. *
* * @since 3.2 */ public static final boolean IS_OS_WINDOWS_8 = getOSMatches(OS_NAME_WINDOWS_PREFIX, "6.2"); /** ** Gets the Java home directory as a {@code File}. *
* * @return a directory * @throws SecurityException if a security manager exists and its {@code checkPropertyAccess} 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)); } /** ** Gets the Java IO temporary directory as a {@code File}. *
* * @return a directory * @throws SecurityException if a security manager exists and its {@code checkPropertyAccess} 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)); } /** ** Decides if the Java version matches. *
* * @param versionPrefix the prefix for the java version * @return true if matches, or false if not or can't determine */ private static boolean getJavaVersionMatches(final String versionPrefix) { return isJavaVersionMatch(JAVA_SPECIFICATION_VERSION, versionPrefix); } /** * Decides if the operating system matches. * * @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(final String osNamePrefix, final String osVersionPrefix) { return isOSMatch(OS_NAME, OS_VERSION, osNamePrefix, osVersionPrefix); } /** * Decides if the operating system matches. * * @param osNamePrefix the prefix for the os name * @return true if matches, or false if not or can't determine */ private static boolean getOSMatchesName(final String osNamePrefix) { return isOSNameMatch(OS_NAME, osNamePrefix); } // ----------------------------------------------------------------------- /** ** Gets a System property, defaulting to {@code null} if the property cannot be read. *
** If a {@code SecurityException} is caught, the return value is {@code null} and a message is written to * {@code System.err}. *
* * @param property the system property name * @return the system property value or {@code null} if a security problem occurs */ private static String getSystemProperty(final String property) { try { return System.getProperty(property); } catch (final 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; } } /** ** Gets the user directory as a {@code File}. *
* * @return a directory * @throws SecurityException if a security manager exists and its {@code checkPropertyAccess} 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)); } /** ** Gets the user home directory as a {@code File}. *
* * @return a directory * @throws SecurityException if a security manager exists and its {@code checkPropertyAccess} 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)); } /** * Returns whether the {@link #JAVA_AWT_HEADLESS} value is {@code true}. * * @return {@code true} if {@code JAVA_AWT_HEADLESS} is {@code "true"}, {@code false} 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; } /** ** Is the Java version at least the requested version. *
** Example input: *
*-
*
- {@code 1.2f} to test for Java 1.2 *
- {@code 1.31f} to test for Java 1.3.1 *
* Decides if the Java version matches. *
** This method is package private instead of private to support unit test invocation. *
* * @param version the actual Java version * @param versionPrefix the prefix for the expected Java version * @return true if matches, or false if not or can't determine */ static boolean isJavaVersionMatch(final String version, final String versionPrefix) { if (version == null) { return false; } return version.startsWith(versionPrefix); } /** * Decides if the operating system matches. ** This method is package private instead of private to support unit test invocation. *
* * @param osName the actual OS name * @param osVersion the actual OS version * @param osNamePrefix the prefix for the expected OS name * @param osVersionPrefix the prefix for the expected OS version * @return true if matches, or false if not or can't determine */ static boolean isOSMatch(final String osName, final String osVersion, final String osNamePrefix, final String osVersionPrefix) { if (osName == null || osVersion == null) { return false; } return osName.startsWith(osNamePrefix) && osVersion.startsWith(osVersionPrefix); } /** * Decides if the operating system matches. ** This method is package private instead of private to support unit test invocation. *
* * @param osName the actual OS name * @param osNamePrefix the prefix for the expected OS name * @return true if matches, or false if not or can't determine */ static boolean isOSNameMatch(final String osName, final String osNamePrefix) { if (osName == null) { return false; } return osName.startsWith(osNamePrefix); } // ----------------------------------------------------------------------- /** ** SystemUtils instances should NOT be constructed in standard programming. Instead, the class should be used as * {@code SystemUtils.FILE_SEPARATOR}. *
** This constructor is public to permit tools that require a JavaBean instance to operate. *
*/ public SystemUtils() { super(); } }