SystemUtils.java
/*
* 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
*
* https://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;
import java.nio.file.Path;
import java.nio.file.Paths;
/**
* Helpers for {@link System}.
*
* <p>
* 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}.
* </p>
* <p>
* #ThreadSafe#
* </p>
*
* @since 1.0
* @see SystemProperties
*/
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.
/**
* A constant for the System Property {@code file.encoding}.
*
* <p>
* File encoding, such as {@code Cp1252}.
* </p>
* <p>
* Defaults to {@code null} 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 SystemProperties#getFileEncoding()
* @since 2.0
* @since Java 1.2
*/
public static final String FILE_ENCODING = SystemProperties.getFileEncoding();
/**
* A constant for the System Property {@code file.separator}.
* <p>
* The file separator is:
* </p>
* <ul>
* <li>{@code "/"} on Unix</li>
* <li>{@code "\"} on Windows.</li>
* </ul>
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getFileSeparator()
* @deprecated Use {@link File#separator}, since it is guaranteed to be a string containing a single character and it does not require a privilege check.
* @since Java 1.1
*/
@Deprecated
public static final String FILE_SEPARATOR = SystemProperties.getFileSeparator();
/**
* A constant for the System Property {@code java.awt.fonts}.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaAwtFonts()
* @since 2.1
*/
public static final String JAVA_AWT_FONTS = SystemProperties.getJavaAwtFonts();
/**
* A constant for the System Property {@code java.awt.graphicsenv}.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaAwtGraphicsenv()
* @since 2.1
*/
public static final String JAVA_AWT_GRAPHICSENV = SystemProperties.getJavaAwtGraphicsenv();
/**
* A constant for the System Property {@code java.awt.headless}. The value of this property is the String {@code "true"} or {@code "false"}.
*
* <p>
* Defaults to {@code null} 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()
* @see SystemProperties#getJavaAwtHeadless()
* @since 2.1
* @since Java 1.4
*/
public static final String JAVA_AWT_HEADLESS = SystemProperties.getJavaAwtHeadless();
/**
* A constant for the System Property {@code java.awt.printerjob}.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaAwtPrinterjob()
* @since 2.1
*/
public static final String JAVA_AWT_PRINTERJOB = SystemProperties.getJavaAwtPrinterjob();
/**
* A constant for the System Property {@code java.class.path}. Java class path.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaClassPath()
* @since Java 1.1
*/
public static final String JAVA_CLASS_PATH = SystemProperties.getJavaClassPath();
/**
* A constant for the System Property {@code java.class.version}. Java class format version number.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaClassVersion()
* @since Java 1.1
*/
public static final String JAVA_CLASS_VERSION = SystemProperties.getJavaClassVersion();
/**
* A constant for the System Property {@code java.compiler}. Name of JIT compiler to use. First in JDK version 1.2. Not used in Sun JDKs after 1.2.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaCompiler()
* @since Java 1.2. Not used in Sun versions after 1.2.
*/
public static final String JAVA_COMPILER = SystemProperties.getJavaCompiler();
/**
* A constant for the System Property {@code java.endorsed.dirs}. Path of endorsed directory or directories.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaEndorsedDirs()
* @since Java 1.4
*/
public static final String JAVA_ENDORSED_DIRS = SystemProperties.getJavaEndorsedDirs();
/**
* A constant for the System Property {@code java.ext.dirs}. Path of extension directory or directories.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaExtDirs()
* @since Java 1.3
*/
public static final String JAVA_EXT_DIRS = SystemProperties.getJavaExtDirs();
/**
* A constant for the System Property {@code java.home}. Java installation directory.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaHome()
* @since Java 1.1
*/
public static final String JAVA_HOME = SystemProperties.getJavaHome();
/**
* A constant for the System Property {@code java.io.tmpdir}. Default temp file path.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaIoTmpdir()
* @since Java 1.2
*/
public static final String JAVA_IO_TMPDIR = SystemProperties.getJavaIoTmpdir();
/**
* A constant for the System Property {@code java.library.path}. List of paths to search when loading libraries.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaLibraryPath()
* @since Java 1.2
*/
public static final String JAVA_LIBRARY_PATH = SystemProperties.getJavaLibraryPath();
/**
* A constant for the System Property {@code java.runtime.name}. Java Runtime Environment name.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaRuntimeName()
* @since 2.0
* @since Java 1.3
*/
public static final String JAVA_RUNTIME_NAME = SystemProperties.getJavaRuntimeName();
/**
* A constant for the System Property {@code java.runtime.version}. Java Runtime Environment version.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaRuntimeVersion()
* @since 2.0
* @since Java 1.3
*/
public static final String JAVA_RUNTIME_VERSION = SystemProperties.getJavaRuntimeVersion();
/**
* A constant for the System Property {@code java.specification.name}. Java Runtime Environment specification name.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaSpecificationName()
* @since Java 1.2
*/
public static final String JAVA_SPECIFICATION_NAME = SystemProperties.getJavaSpecificationName();
/**
* A constant for the System Property {@code java.specification.vendor}. Java Runtime Environment specification vendor.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaSpecificationVendor()
* @since Java 1.2
*/
public static final String JAVA_SPECIFICATION_VENDOR = SystemProperties.getJavaSpecificationVendor();
/**
* A constant for the System Property {@code java.specification.version}. Java Runtime Environment specification version.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaSpecificationVersion()
* @since Java 1.3
*/
public static final String JAVA_SPECIFICATION_VERSION = SystemProperties.getJavaSpecificationVersion();
private static final JavaVersion JAVA_SPECIFICATION_VERSION_AS_ENUM = JavaVersion.get(JAVA_SPECIFICATION_VERSION);
/**
* A constant for the System Property {@code java.util.prefs.PreferencesFactory}. A class name.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaUtilPrefsPreferencesFactory()
* @since 2.1
* @since Java 1.4
*/
public static final String JAVA_UTIL_PREFS_PREFERENCES_FACTORY = SystemProperties.getJavaUtilPrefsPreferencesFactory();
/**
* A constant for the System Property {@code java.vendor}. Java vendor-specific string.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaVendor()
* @since Java 1.1
*/
public static final String JAVA_VENDOR = SystemProperties.getJavaVendor();
/**
* A constant for the System Property {@code java.vendor.url}. Java vendor URL.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaVendorUrl()
* @since Java 1.1
*/
public static final String JAVA_VENDOR_URL = SystemProperties.getJavaVendorUrl();
/**
* A constant for the System Property {@code java.version}. Java version number.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaVersion()
* @since Java 1.1
*/
public static final String JAVA_VERSION = SystemProperties.getJavaVersion();
/**
* A constant for the System Property {@code java.vm.info}. Java Virtual Machine implementation info.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaVmInfo()
* @since 2.0
* @since Java 1.2
*/
public static final String JAVA_VM_INFO = SystemProperties.getJavaVmInfo();
/**
* A constant for the System Property {@code java.vm.name}. Java Virtual Machine implementation name.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaVmName()
* @since Java 1.2
*/
public static final String JAVA_VM_NAME = SystemProperties.getJavaVmName();
/**
* A constant for the System Property {@code java.vm.specification.name}. Java Virtual Machine specification name.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaVmSpecificationName()
* @since Java 1.2
*/
public static final String JAVA_VM_SPECIFICATION_NAME = SystemProperties.getJavaVmSpecificationName();
/**
* A constant for the System Property {@code java.vm.specification.vendor}. Java Virtual Machine specification vendor.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaVmSpecificationVendor()
* @since Java 1.2
*/
public static final String JAVA_VM_SPECIFICATION_VENDOR = SystemProperties.getJavaVmSpecificationVendor();
/**
* A constant for the System Property {@code java.vm.specification.version}. Java Virtual Machine specification version.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaVmSpecificationVersion()
* @since Java 1.2
*/
public static final String JAVA_VM_SPECIFICATION_VERSION = SystemProperties.getJavaVmSpecificationVersion();
/**
* A constant for the System Property {@code java.vm.vendor}. Java Virtual Machine implementation vendor.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaVmVendor()
* @since Java 1.2
*/
public static final String JAVA_VM_VENDOR = SystemProperties.getJavaVmVendor();
/**
* A constant for the System Property {@code java.vm.version}. Java Virtual Machine implementation version.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getJavaVmVersion()
* @since Java 1.2
*/
public static final String JAVA_VM_VERSION = SystemProperties.getJavaVmVersion();
/**
* A constant for the System Property {@code line.separator}. Line separator ({@code "\n"} on Unix).
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getLineSeparator()
* @deprecated Use {@link System#lineSeparator()} instead, since it does not require a privilege check.
* @since Java 1.1
*/
@Deprecated
public static final String LINE_SEPARATOR = SystemProperties.getLineSeparator();
/**
* A constant for the System Property {@code os.arch}. Operating system architecture.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getOsArch()
* @since Java 1.1
*/
public static final String OS_ARCH = SystemProperties.getOsArch();
/**
* A constant for the System Property {@code os.name}. Operating system name.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getOsName()
* @since Java 1.1
*/
public static final String OS_NAME = SystemProperties.getOsName();
/**
* A constant for the System Property {@code os.version}. Operating system version.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getOsVersion()
* @since Java 1.1
*/
public static final String OS_VERSION = SystemProperties.getOsVersion();
/**
* A constant for the System Property {@code path.separator}. Path separator ({@code ":"} on Unix).
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getPathSeparator()
* @deprecated Use {@link File#pathSeparator}, since it is guaranteed to be a string containing a single character and it does not require a privilege
* check.
* @since Java 1.1
*/
@Deprecated
public static final String PATH_SEPARATOR = SystemProperties.getPathSeparator();
/**
* A constant for the System Property {@code user.country} or {@code user.region}. 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
*
* <p>
* Defaults to {@code null} 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 = SystemProperties.getProperty(SystemProperties.USER_COUNTRY,
() -> SystemProperties.getProperty(SystemProperties.USER_REGION));
/**
* A constant for the System Property {@code user.dir}. User's current working directory.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getUserDir()
* @since Java 1.1
*/
public static final String USER_DIR = SystemProperties.getUserDir();
/**
* A constant for the System Property {@code user.home}. User's home directory.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getUserHome()
* @since Java 1.1
*/
public static final String USER_HOME = SystemProperties.getUserHome();
/**
* A constant for the System Property {@code user.language}. User's language code, such as {@code "en"}.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getUserLanguage()
* @since 2.0
* @since Java 1.2
*/
public static final String USER_LANGUAGE = SystemProperties.getUserLanguage();
/**
* A constant for the System Property {@code user.name}. User's account name.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getUserName()
* @since Java 1.1
*/
public static final String USER_NAME = SystemProperties.getUserName();
/**
* A constant for the System Property {@code user.timezone}. For example: {@code "America/Los_Angeles"}.
*
* <p>
* Defaults to {@code null} 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 SystemProperties#getUserTimezone()
* @since 2.1
*/
public static final String USER_TIMEZONE = SystemProperties.getUserTimezone();
// Java version checks
// -----------------------------------------------------------------------
// These MUST be declared after those above as they depend on the
// values being set up
/**
* The constant {@code true} if this is Java version 1.1 (also 1.1.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*/
public static final boolean IS_JAVA_1_1 = getJavaVersionMatches("1.1");
/**
* The constant {@code true} if this is Java version 1.2 (also 1.2.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*/
public static final boolean IS_JAVA_1_2 = getJavaVersionMatches("1.2");
/**
* The constant {@code true} if this is Java version 1.3 (also 1.3.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*/
public static final boolean IS_JAVA_1_3 = getJavaVersionMatches("1.3");
/**
* The constant {@code true} if this is Java version 1.4 (also 1.4.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*/
public static final boolean IS_JAVA_1_4 = getJavaVersionMatches("1.4");
/**
* The constant {@code true} if this is Java version 1.5 (also 1.5.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*/
public static final boolean IS_JAVA_1_5 = getJavaVersionMatches("1.5");
/**
* The constant {@code true} if this is Java version 1.6 (also 1.6.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*/
public static final boolean IS_JAVA_1_6 = getJavaVersionMatches("1.6");
/**
* The constant {@code true} if this is Java version 1.7 (also 1.7.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.0
*/
public static final boolean IS_JAVA_1_7 = getJavaVersionMatches("1.7");
/**
* The constant {@code true} if this is Java version 1.8 (also 1.8.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.3.2
*/
public static final boolean IS_JAVA_1_8 = getJavaVersionMatches("1.8");
/**
* The constant {@code true} if this is Java version 1.9 (also 1.9.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.4
* @deprecated As of release 3.5, replaced by {@link #IS_JAVA_9}
*/
@Deprecated
public static final boolean IS_JAVA_1_9 = getJavaVersionMatches("9");
/**
* The constant {@code true} if this is Java version 9 (also 9.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.5
*/
public static final boolean IS_JAVA_9 = getJavaVersionMatches("9");
/**
* The constant {@code true} if this is Java version 10 (also 10.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.7
*/
public static final boolean IS_JAVA_10 = getJavaVersionMatches("10");
/**
* The constant {@code true} if this is Java version 11 (also 11.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.8
*/
public static final boolean IS_JAVA_11 = getJavaVersionMatches("11");
/**
* The constant {@code true} if this is Java version 12 (also 12.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.9
*/
public static final boolean IS_JAVA_12 = getJavaVersionMatches("12");
/**
* The constant {@code true} if this is Java version 13 (also 13.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.9
*/
public static final boolean IS_JAVA_13 = getJavaVersionMatches("13");
/**
* The constant {@code true} if this is Java version 14 (also 14.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.10
*/
public static final boolean IS_JAVA_14 = getJavaVersionMatches("14");
/**
* The constant {@code true} if this is Java version 15 (also 15.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.10
*/
public static final boolean IS_JAVA_15 = getJavaVersionMatches("15");
/**
* The constant {@code true} if this is Java version 16 (also 16.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.13.0
*/
public static final boolean IS_JAVA_16 = getJavaVersionMatches("16");
/**
* The constant {@code true} if this is Java version 17 (also 17.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.13.0
*/
public static final boolean IS_JAVA_17 = getJavaVersionMatches("17");
/**
* The constant {@code true} if this is Java version 18 (also 18.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.13.0
*/
public static final boolean IS_JAVA_18 = getJavaVersionMatches("18");
/**
* The constant {@code true} if this is Java version 19 (also 19.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.13.0
*/
public static final boolean IS_JAVA_19 = getJavaVersionMatches("19");
/**
* The constant {@code true} if this is Java version 20 (also 20.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.13.0
*/
public static final boolean IS_JAVA_20 = getJavaVersionMatches("20");
/**
* The constant {@code true} if this is Java version 21 (also 21.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.13.0
*/
public static final boolean IS_JAVA_21 = getJavaVersionMatches("21");
/**
* The constant {@code true} if this is Java version 22 (also 22.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.15.0
*/
public static final boolean IS_JAVA_22 = getJavaVersionMatches("22");
/**
* The constant {@code true} if this is Java version 23 (also 23.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.18.0
*/
public static final boolean IS_JAVA_23 = getJavaVersionMatches("23");
/**
* The constant {@code true} if this is Java version 24 (also 24.x versions).
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_SPECIFICATION_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.18.0
*/
public static final boolean IS_JAVA_24 = getJavaVersionMatches("24");
// Operating system checks
// -----------------------------------------------------------------------
// These MUST be declared after those above as they depend on the
// values being set up
// Please advise dev@commons.apache.org if you want another added
// or a mistake corrected
/**
* The constant {@code true} if this is AIX.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_AIX = getOsNameMatches("AIX");
/**
* The constant {@code true} if this is Android.
*
* <p>
* See https://developer.android.com/reference/java/lang/System#getProperties().
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.15.0
*/
public static final boolean IS_OS_ANDROID = Strings.CS.contains(SystemProperties.getJavaVendor(), "Android");
/**
* The constant {@code true} if this is HP-UX.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_HP_UX = getOsNameMatches("HP-UX");
/**
* The constant {@code true} if this is IBM OS/400.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.3
*/
public static final boolean IS_OS_400 = getOsNameMatches("OS/400");
/**
* The constant {@code true} if this is Irix.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_IRIX = getOsNameMatches("Irix");
/**
* The constant {@code true} if this is Linux.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_LINUX = getOsNameMatches("Linux");
/**
* The constant {@code true} if this is Mac.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_MAC = getOsNameMatches("Mac");
/**
* The constant {@code true} if this is Mac.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_MAC_OSX = getOsNameMatches("Mac OS X");
/**
* The constant {@code true} if this is macOS X Cheetah.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_CHEETAH = getOsMatches("Mac OS X", "10.0");
/**
* The constant {@code true} if this is macOS X Puma.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_PUMA = getOsMatches("Mac OS X", "10.1");
/**
* The constant {@code true} if this is macOS X Jaguar.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_JAGUAR = getOsMatches("Mac OS X", "10.2");
/**
* The constant {@code true} if this is macOS X Panther.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_PANTHER = getOsMatches("Mac OS X", "10.3");
/**
* The constant {@code true} if this is macOS X Tiger.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_TIGER = getOsMatches("Mac OS X", "10.4");
/**
* The constant {@code true} if this is macOS X Leopard.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_LEOPARD = getOsMatches("Mac OS X", "10.5");
/**
* The constant {@code true} if this is macOS X Snow Leopard.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_SNOW_LEOPARD = getOsMatches("Mac OS X", "10.6");
/**
* The constant {@code true} if this is macOS X Lion.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_LION = getOsMatches("Mac OS X", "10.7");
/**
* The constant {@code true} if this is macOS X Mountain Lion.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_MOUNTAIN_LION = getOsMatches("Mac OS X", "10.8");
/**
* The constant {@code true} if this is macOS X Mavericks.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_MAVERICKS = getOsMatches("Mac OS X", "10.9");
/**
* The constant {@code true} if this is macOS X Yosemite.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_YOSEMITE = getOsMatches("Mac OS X", "10.10");
/**
* The constant {@code true} if this is macOS X El Capitan.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.5
*/
public static final boolean IS_OS_MAC_OSX_EL_CAPITAN = getOsMatches("Mac OS X", "10.11");
/**
* The constant {@code true} if this is macOS X Sierra.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.12.0
*/
public static final boolean IS_OS_MAC_OSX_SIERRA = getOsMatches("Mac OS X", "10.12");
/**
* The constant {@code true} if this is macOS X High Sierra.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.12.0
*/
public static final boolean IS_OS_MAC_OSX_HIGH_SIERRA = getOsMatches("Mac OS X", "10.13");
/**
* The constant {@code true} if this is macOS X Mojave.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.12.0
*/
public static final boolean IS_OS_MAC_OSX_MOJAVE = getOsMatches("Mac OS X", "10.14");
/**
* The constant {@code true} if this is macOS X Catalina.
*
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.12.0
*/
public static final boolean IS_OS_MAC_OSX_CATALINA = getOsMatches("Mac OS X", "10.15");
/**
* The constant {@code true} if this is macOS X Big Sur.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.12.0
*/
public static final boolean IS_OS_MAC_OSX_BIG_SUR = getOsMatches("Mac OS X", "11");
/**
* The constant {@code true} if this is macOS X Monterey.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.13.0
*/
public static final boolean IS_OS_MAC_OSX_MONTEREY = getOsMatches("Mac OS X", "12");
/**
* The constant {@code true} if this is macOS X Ventura.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.13.0
*/
public static final boolean IS_OS_MAC_OSX_VENTURA = getOsMatches("Mac OS X", "13");
/**
* The constant {@code true} if this is macOS X Sonoma.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.15.0
*/
public static final boolean IS_OS_MAC_OSX_SONOMA = getOsMatches("Mac OS X", "14");
/**
* The constant {@code true} if this is macOS X Sequoia.
* <p>
* The value depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The value is {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.18.0
*/
public static final boolean IS_OS_MAC_OSX_SEQUOIA = getOsMatches("Mac OS X", "15");
/**
* The constant {@code true} if this is FreeBSD.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.1
*/
public static final boolean IS_OS_FREE_BSD = getOsNameMatches("FreeBSD");
/**
* The constant {@code true} if this is OpenBSD.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.1
*/
public static final boolean IS_OS_OPEN_BSD = getOsNameMatches("OpenBSD");
/**
* The constant {@code true} if this is NetBSD.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.1
*/
public static final boolean IS_OS_NET_BSD = getOsNameMatches("NetBSD");
/**
* The constant {@code true} if this is OS/2.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_OS2 = getOsNameMatches("OS/2");
/**
* The constant {@code true} if this is Solaris.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_SOLARIS = getOsNameMatches("Solaris");
/**
* The constant {@code true} if this is SunOS.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_SUN_OS = getOsNameMatches("SunOS");
/**
* The constant {@code true} if this is a Unix like system, as in any of AIX, HP-UX, Irix, Linux, MacOSX, Solaris or SUN OS.
*
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </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
|| IS_OS_FREE_BSD || IS_OS_OPEN_BSD || IS_OS_NET_BSD;
/**
* The constant {@code true} if this is Windows.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS = getOsNameMatches(OS_NAME_WINDOWS_PREFIX);
/**
* The constant {@code true} if this is Windows 2000.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_2000 = getOsNameMatches(OS_NAME_WINDOWS_PREFIX + " 2000");
/**
* The constant {@code true} if this is Windows 2003.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.1
*/
public static final boolean IS_OS_WINDOWS_2003 = getOsNameMatches(OS_NAME_WINDOWS_PREFIX + " 2003");
/**
* The constant {@code true} if this is Windows Server 2008.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.1
*/
public static final boolean IS_OS_WINDOWS_2008 = getOsNameMatches(OS_NAME_WINDOWS_PREFIX + " Server 2008");
/**
* The constant {@code true} if this is Windows Server 2012.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_WINDOWS_2012 = getOsNameMatches(OS_NAME_WINDOWS_PREFIX + " Server 2012");
/**
* The constant {@code true} if this is Windows 95.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_95 = getOsNameMatches(OS_NAME_WINDOWS_PREFIX + " 95");
/**
* The constant {@code true} if this is Windows 98.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_98 = getOsNameMatches(OS_NAME_WINDOWS_PREFIX + " 98");
/**
* The constant {@code true} if this is Windows ME.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_ME = getOsNameMatches(OS_NAME_WINDOWS_PREFIX + " Me");
/**
* The constant {@code true} if this is Windows NT.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_NT = getOsNameMatches(OS_NAME_WINDOWS_PREFIX + " NT");
/**
* The constant {@code true} if this is Windows XP.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_XP = getOsNameMatches(OS_NAME_WINDOWS_PREFIX + " XP");
/**
* The constant {@code true} if this is Windows Vista.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 2.4
*/
public static final boolean IS_OS_WINDOWS_VISTA = getOsNameMatches(OS_NAME_WINDOWS_PREFIX + " Vista");
/**
* The constant {@code true} if this is Windows 7.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.0
*/
public static final boolean IS_OS_WINDOWS_7 = getOsNameMatches(OS_NAME_WINDOWS_PREFIX + " 7");
/**
* The constant {@code true} if this is Windows 8.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.2
*/
public static final boolean IS_OS_WINDOWS_8 = getOsNameMatches(OS_NAME_WINDOWS_PREFIX + " 8");
/**
* The constant {@code true} if this is Windows 10.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.5
*/
public static final boolean IS_OS_WINDOWS_10 = getOsNameMatches(OS_NAME_WINDOWS_PREFIX + " 10");
/**
* The constant {@code true} if this is Windows 11.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* OpenJDK fixed the return value for {@code os.name} on Windows 11 to versions 8, 11, and 17:
* </p>
* <ul>
* <li>Affects Java versions 7u321, 8u311, 11.0.13-oracle, 17.0.1: https://bugs.openjdk.org/browse/JDK-8274737</li>
* <li>Fixed in OpenJDK commit https://github.com/openjdk/jdk/commit/97ea9dd2f24f9f1fb9b9345a4202a825ee28e014</li>
* </ul>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.13.0
*/
public static final boolean IS_OS_WINDOWS_11 = getOsNameMatches(OS_NAME_WINDOWS_PREFIX + " 11");
/**
* The constant {@code true} if this is z/OS.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The field will return {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
* <p>
* This value is initialized when the class is loaded.
* </p>
*
* @since 3.5
*/
// Values on a z/OS system I tested (Gary Gregory - 2016-03-12)
// os.arch = s390x
// os.encoding = ISO8859_1
// os.name = z/OS
// os.version = 02.02.00
public static final boolean IS_OS_ZOS = getOsNameMatches("z/OS");
/**
* The System property key for the user home directory.
*/
public static final String USER_HOME_KEY = "user.home";
/**
* The System property key for the user name.
*
* @deprecated Use {@link SystemProperties#USER_NAME}.
*/
@Deprecated
public static final String USER_NAME_KEY = "user.name";
/**
* The System property key for the user directory.
*
* @deprecated Use {@link SystemProperties#USER_DIR}.
*/
@Deprecated
public static final String USER_DIR_KEY = "user.dir";
/**
* The System property key for the Java IO temporary directory.
*
* @deprecated Use {@link SystemProperties#JAVA_IO_TMPDIR}.
*/
@Deprecated
public static final String JAVA_IO_TMPDIR_KEY = "java.io.tmpdir";
/**
* The System property key for the Java home directory.
*
* @deprecated Use {@link SystemProperties#JAVA_HOME}.
*/
@Deprecated
public static final String JAVA_HOME_KEY = "java.home";
/**
* A constant for the System Property {@code awt.toolkit}.
*
* <p>
* Holds a class name, on Windows XP this is {@code sun.awt.windows.WToolkit}.
* </p>
* <p>
* <strong>On platforms without a GUI, this value is {@code null}.</strong>
* </p>
* <p>
* Defaults to {@code null} 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
* @see SystemProperties#getAwtToolkit()
*/
public static final String AWT_TOOLKIT = SystemProperties.getAwtToolkit();
/**
* Gets an environment variable, defaulting to {@code defaultValue} if the variable cannot be read.
*
* <p>
* If a {@link SecurityException} is caught, the return value is {@code defaultValue} and a message is written to {@code System.err}.
* </p>
*
* @param name the environment variable name.
* @param defaultValue the default value.
* @return the environment variable value or {@code defaultValue} if a security problem occurs.
* @since 3.8
*/
public static String getEnvironmentVariable(final String name, final String defaultValue) {
try {
final String value = System.getenv(name);
return value == null ? defaultValue : value;
} catch (final SecurityException ex) {
// we are not allowed to look at this property
// System.err.println("Caught a SecurityException reading the environment variable '" + name + "'.");
return defaultValue;
}
}
/**
* Gets the host name from an environment variable ({@code COMPUTERNAME} on Windows, {@code HOSTNAME} elsewhere).
*
* <p>
* If you want to know what the network stack says is the host name, you should use {@code InetAddress.getLocalHost().getHostName()}.
* </p>
*
* @return the host name. Will be {@code null} if the environment variable is not defined.
* @since 3.6
*/
public static String getHostName() {
return IS_OS_WINDOWS ? System.getenv("COMPUTERNAME") : System.getenv("HOSTNAME");
}
/**
* Gets the current Java home directory as a {@link 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 SystemProperties#getJavaHome()
* @since 2.1
*/
public static File getJavaHome() {
return new File(SystemProperties.getJavaHome());
}
/**
* Gets the current Java home directory as a {@link 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 SystemProperties#getJavaHome()
* @since 3.18.0
*/
public static Path getJavaHomePath() {
return Paths.get(SystemProperties.getJavaHome());
}
/**
* Gets the current Java IO temporary directory as a {@link 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 SystemProperties#getJavaIoTmpdir()
* @since 2.1
*/
public static File getJavaIoTmpDir() {
return new File(SystemProperties.getJavaIoTmpdir());
}
/**
* Gets the current Java IO temporary directory as a {@link Path}.
*
* @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 SystemProperties#getJavaIoTmpdir()
* @since 3.18.0
*/
public static Path getJavaIoTmpDirPath() {
return Paths.get(SystemProperties.getJavaIoTmpdir());
}
/**
* Tests if the Java version matches the version we are running.
* <p>
* The result depends on the value of the {@link #JAVA_SPECIFICATION_VERSION} constant.
* </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(final String versionPrefix) {
return isJavaVersionMatch(JAVA_SPECIFICATION_VERSION, versionPrefix);
}
/**
* Tests if the operating system matches the given name prefix and version prefix.
* <p>
* The result depends on the value of the {@link #OS_NAME} and {@link #OS_VERSION} constants.
* </p>
* <p>
* The method returns {@code false} if {@link #OS_NAME} or {@link #OS_VERSION} is {@code null}.
* </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(final String osNamePrefix, final String osVersionPrefix) {
return isOsMatch(OS_NAME, OS_VERSION, osNamePrefix, osVersionPrefix);
}
/**
* Tests if the operating system matches the given string with a case-insensitive comparison.
* <p>
* The result depends on the value of the {@link #OS_NAME} constant.
* </p>
* <p>
* The method returns {@code false} if {@link #OS_NAME} is {@code null}.
* </p>
*
* @param osNamePrefix the prefix for the OS name.
* @return true if matches, or false if not or can't determine.
*/
private static boolean getOsNameMatches(final String osNamePrefix) {
return isOsNameMatch(OS_NAME, osNamePrefix);
}
/**
* Gets the current user directory as a {@link File}.
* <p>
* The result is based on the system property {@value SystemProperties#USER_DIR}.
* </p>
*
* @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 SystemProperties#getUserDir()
* @since 2.1
*/
public static File getUserDir() {
return new File(SystemProperties.getUserDir());
}
/**
* Gets the current user directory as a {@link Path}.
* <p>
* The result is based on the system property {@value SystemProperties#USER_DIR}.
* </p>
*
* @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 SystemProperties#getUserDir()
* @since 3.18.0
*/
public static Path getUserDirPath() {
return Paths.get(SystemProperties.getUserDir());
}
/**
* Gets the current user home directory as a {@link File}.
* <p>
* The result is based on the system property {@value SystemProperties#USER_HOME}.
* </p>
*
* @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 SystemProperties#getUserHome()
* @since 2.1
*/
public static File getUserHome() {
return new File(SystemProperties.getUserHome());
}
/**
* Gets the current user home directory as a {@link Path}.
* <p>
* The result is based on the system property {@value SystemProperties#USER_HOME}.
* </p>
*
* @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 SystemProperties#getUserHome()
* @since 3.18.0
*/
public static Path getUserHomePath() {
return Paths.get(SystemProperties.getUserHome());
}
/**
* Gets the current user name.
* <p>
* The result is based on the system property {@value SystemProperties#USER_NAME}.
* </p>
*
* @return a name.
* @throws SecurityException if a security manager exists and its {@code checkPropertyAccess} method doesn't allow access to the specified system property.
* @see SystemProperties#getUserName()
* @since 3.10
* @deprecated Use {@link SystemProperties#getUserName()}.
*/
@Deprecated
public static String getUserName() {
return SystemProperties.getUserName();
}
/**
* Gets the user name.
* <p>
* The result is based on the system property {@value SystemProperties#USER_NAME}.
* </p>
*
* @param defaultValue A default value.
* @return a name.
* @throws SecurityException if a security manager exists and its {@code checkPropertyAccess} method doesn't allow access to the specified system property.
* @see SystemProperties#getUserName()
* @since 3.10
* @deprecated Use {@link SystemProperties#getUserName(String)}.
*/
@Deprecated
public static String getUserName(final String defaultValue) {
return SystemProperties.getUserName(defaultValue);
}
/**
* Tests whether the {@link #JAVA_AWT_HEADLESS} value is {@code true}.
* <p>
* The result is based on the system property {@value SystemProperties#JAVA_AWT_HEADLESS}.
* </p>
*
* @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 Boolean.TRUE.toString().equals(JAVA_AWT_HEADLESS);
}
/**
* Tests whether the Java version at least the requested version.
* <p>
* The result is based on the system property saved in {@link #JAVA_SPECIFICATION_VERSION}.
* </p>
*
* @param requiredVersion the required version, for example 1.31f.
* @return {@code true} if the actual version is equal or greater than the required version.
*/
public static boolean isJavaVersionAtLeast(final JavaVersion requiredVersion) {
return JAVA_SPECIFICATION_VERSION_AS_ENUM != null && JAVA_SPECIFICATION_VERSION_AS_ENUM.atLeast(requiredVersion);
}
/**
* Tests whether the Java version at most the requested version.
* <p>
* The result is based on the system property saved in {@link #JAVA_SPECIFICATION_VERSION}.
* </p>
*
* @param requiredVersion the required version, for example 1.31f.
* @return {@code true} if the actual version is equal or less than the required version.
* @since 3.9
*/
public static boolean isJavaVersionAtMost(final JavaVersion requiredVersion) {
return JAVA_SPECIFICATION_VERSION_AS_ENUM != null && JAVA_SPECIFICATION_VERSION_AS_ENUM.atMost(requiredVersion);
}
/**
* Tests whether the Java version matches.
*
* <p>
* This method is package private instead of private to support unit test invocation.
* </p>
*
* @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);
}
/**
* Tests whether the operating system matches.
* <p>
* This method is package private instead of private to support unit test invocation.
* </p>
*
* @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 isOsNameMatch(osName, osNamePrefix) && isOsVersionMatch(osVersion, osVersionPrefix);
}
/**
* Tests whether the operating system matches with a case-insensitive comparison.
* <p>
* This method is package private instead of private to support unit test invocation.
* </p>
*
* @param osName the actual OS name.
* @param osNamePrefix the prefix for the expected OS name.
* @return true for a case-insensitive match, or false if not.
*/
static boolean isOsNameMatch(final String osName, final String osNamePrefix) {
if (osName == null) {
return false;
}
return Strings.CI.startsWith(osName, osNamePrefix);
}
/**
* Tests whether the operating system version matches.
* <p>
* This method is package private instead of private to support unit test invocation.
* </p>
*
* @param osVersion the actual OS version.
* @param osVersionPrefix the prefix for the expected OS version.
* @return true if matches, or false if not or can't determine.
*/
static boolean isOsVersionMatch(final String osVersion, final String osVersionPrefix) {
if (StringUtils.isEmpty(osVersion)) {
return false;
}
// Compare parts of the version string instead of using String.startsWith(String) because otherwise
// osVersionPrefix 10.1 would also match osVersion 10.10
final String[] versionPrefixParts = JavaVersion.split(osVersionPrefix);
final String[] versionParts = JavaVersion.split(osVersion);
for (int i = 0; i < Math.min(versionPrefixParts.length, versionParts.length); i++) {
if (!versionPrefixParts[i].equals(versionParts[i])) {
return false;
}
}
return true;
}
/**
* SystemUtils instances shouldn't be constructed in standard programming. Instead, elements should be accessed directly, for example
* {@code SystemUtils.FILE_SEPARATOR}.
*
* <p>
* This constructor is public to permit tools that require a JavaBean instance to operate.
* </p>
*/
public SystemUtils() {
}
}