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eaglercraft-1.8/sources/main/java/org/apache/commons/lang3/SystemUtils.java

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Update #0 - First Release
2022-12-25 01:12:28 -08:00
/*
* 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;
/**
* <p>
* Helpers for {@code java.lang.System}.
* </p>
* <p>
* If a system property cannot be read due to security restrictions, the
* corresponding field in this class will be set to {@code null} and a message
* will be written to {@code System.err}.
* </p>
* <p>
* #ThreadSafe#
* </p>
*
* @since 1.0
*/
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 name.
*/
private static final String USER_NAME_KEY = "user.name";
/**
* The System property key for the user directory.
*/
private static final String USER_DIR_KEY = "user.dir";
/**
* The System property key for the Java IO temporary directory.
*/
private static final String JAVA_IO_TMPDIR_KEY = "java.io.tmpdir";
/**
* The System property key for the Java home directory.
*/
private static final String JAVA_HOME_KEY = "java.home";
/**
* <p>
* The {@code awt.toolkit} System Property.
* </p>
* <p>
* Holds a class name, on Windows XP this is {@code sun.awt.windows.WToolkit}.
* </p>
* <p>
* <b>On platforms without a GUI, this value is {@code null}.</b>
* </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
*/
public static final String AWT_TOOLKIT = getSystemProperty("awt.toolkit");
/**
* <p>
* The {@code file.encoding} System Property.
* </p>
* <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>
*
* @since 2.0
* @since Java 1.2
*/
public static final String FILE_ENCODING = getSystemProperty("file.encoding");
/**
* <p>
* The {@code file.separator} System Property. 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>
*
* @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 = getSystemProperty("file.separator");
/**
* <p>
* The {@code java.awt.fonts} System Property.
* </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
*/
public static final String JAVA_AWT_FONTS = getSystemProperty("java.awt.fonts");
/**
* <p>
* The {@code java.awt.graphicsenv} System Property.
* </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
*/
public static final String JAVA_AWT_GRAPHICSENV = getSystemProperty("java.awt.graphicsenv");
/**
* <p>
* The {@code java.awt.headless} System Property. The value of this property is
* the String {@code "true"} or {@code "false"}.
* </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 #isJavaAwtHeadless()
* @since 2.1
* @since Java 1.4
*/
public static final String JAVA_AWT_HEADLESS = getSystemProperty("java.awt.headless");
/**
* <p>
* The {@code java.awt.printerjob} System Property.
* </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
*/
public static final String JAVA_AWT_PRINTERJOB = getSystemProperty("java.awt.printerjob");
/**
* <p>
* The {@code java.class.path} System Property. Java class path.
* </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 Java 1.1
*/
public static final String JAVA_CLASS_PATH = getSystemProperty("java.class.path");
/**
* <p>
* The {@code java.class.version} System Property. Java class format version
* number.
* </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 Java 1.1
*/
public static final String JAVA_CLASS_VERSION = getSystemProperty("java.class.version");
/**
* <p>
* 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.
* </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 Java 1.2. Not used in Sun versions after 1.2.
*/
public static final String JAVA_COMPILER = getSystemProperty("java.compiler");
/**
* <p>
* The {@code java.endorsed.dirs} System Property. Path of endorsed directory or
* directories.
* </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 Java 1.4
*/
public static final String JAVA_ENDORSED_DIRS = getSystemProperty("java.endorsed.dirs");
/**
* <p>
* The {@code java.ext.dirs} System Property. Path of extension directory or
* directories.
* </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 Java 1.3
*/
public static final String JAVA_EXT_DIRS = getSystemProperty("java.ext.dirs");
/**
* <p>
* The {@code java.home} System Property. Java installation directory.
* </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 Java 1.1
*/
public static final String JAVA_HOME = getSystemProperty(JAVA_HOME_KEY);
/**
* <p>
* The {@code java.io.tmpdir} System Property. Default temp file path.
* </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 Java 1.2
*/
public static final String JAVA_IO_TMPDIR = getSystemProperty(JAVA_IO_TMPDIR_KEY);
/**
* <p>
* The {@code java.library.path} System Property. List of paths to search when
* loading libraries.
* </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 Java 1.2
*/
public static final String JAVA_LIBRARY_PATH = getSystemProperty("java.library.path");
/**
* <p>
* The {@code java.runtime.name} System Property. Java Runtime Environment name.
* </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 2.0
* @since Java 1.3
*/
public static final String JAVA_RUNTIME_NAME = getSystemProperty("java.runtime.name");
/**
* <p>
* The {@code java.runtime.version} System Property. Java Runtime Environment
* version.
* </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 2.0
* @since Java 1.3
*/
public static final String JAVA_RUNTIME_VERSION = getSystemProperty("java.runtime.version");
/**
* <p>
* The {@code java.specification.name} System Property. Java Runtime Environment
* specification name.
* </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 Java 1.2
*/
public static final String JAVA_SPECIFICATION_NAME = getSystemProperty("java.specification.name");
/**
* <p>
* The {@code java.specification.vendor} System Property. Java Runtime
* Environment specification vendor.
* </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 Java 1.2
*/
public static final String JAVA_SPECIFICATION_VENDOR = getSystemProperty("java.specification.vendor");
/**
* <p>
* The {@code java.specification.version} System Property. Java Runtime
* Environment specification version.
* </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 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);
/**
* <p>
* The {@code java.util.prefs.PreferencesFactory} System Property. A class name.
* </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
* @since Java 1.4
*/
public static final String JAVA_UTIL_PREFS_PREFERENCES_FACTORY = getSystemProperty(
"java.util.prefs.PreferencesFactory");
/**
* <p>
* The {@code java.vendor} System Property. Java vendor-specific string.
* </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 Java 1.1
*/
public static final String JAVA_VENDOR = getSystemProperty("java.vendor");
/**
* <p>
* The {@code java.vendor.url} System Property. Java vendor URL.
* </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 Java 1.1
*/
public static final String JAVA_VENDOR_URL = getSystemProperty("java.vendor.url");
/**
* <p>
* The {@code java.version} System Property. Java version number.
* </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 Java 1.1
*/
public static final String JAVA_VERSION = getSystemProperty("java.version");
/**
* <p>
* The {@code java.vm.info} System Property. Java Virtual Machine implementation
* info.
* </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 2.0
* @since Java 1.2
*/
public static final String JAVA_VM_INFO = getSystemProperty("java.vm.info");
/**
* <p>
* The {@code java.vm.name} System Property. Java Virtual Machine implementation
* name.
* </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 Java 1.2
*/
public static final String JAVA_VM_NAME = getSystemProperty("java.vm.name");
/**
* <p>
* The {@code java.vm.specification.name} System Property. Java Virtual Machine
* specification name.
* </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 Java 1.2
*/
public static final String JAVA_VM_SPECIFICATION_NAME = getSystemProperty("java.vm.specification.name");
/**
* <p>
* The {@code java.vm.specification.vendor} System Property. Java Virtual
* Machine specification vendor.
* </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 Java 1.2
*/
public static final String JAVA_VM_SPECIFICATION_VENDOR = getSystemProperty("java.vm.specification.vendor");
/**
* <p>
* The {@code java.vm.specification.version} System Property. Java Virtual
* Machine specification version.
* </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 Java 1.2
*/
public static final String JAVA_VM_SPECIFICATION_VERSION = getSystemProperty("java.vm.specification.version");
/**
* <p>
* The {@code java.vm.vendor} System Property. Java Virtual Machine
* implementation vendor.
* </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 Java 1.2
*/
public static final String JAVA_VM_VENDOR = getSystemProperty("java.vm.vendor");
/**
* <p>
* The {@code java.vm.version} System Property. Java Virtual Machine
* implementation version.
* </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 Java 1.2
*/
public static final String JAVA_VM_VERSION = getSystemProperty("java.vm.version");
/**
* <p>
* The {@code line.separator} System Property. Line separator
* ({@code &quot;\n&quot;} on UNIX).
* </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>
*
* @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 = getSystemProperty("line.separator");
/**
* <p>
* The {@code os.arch} System Property. Operating system architecture.
* </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 Java 1.1
*/
public static final String OS_ARCH = getSystemProperty("os.arch");
/**
* <p>
* The {@code os.name} System Property. Operating system name.
* </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 Java 1.1
*/
public static final String OS_NAME = getSystemProperty("os.name");
/**
* <p>
* The {@code os.version} System Property. Operating system version.
* </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 Java 1.1
*/
public static final String OS_VERSION = getSystemProperty("os.version");
/**
* <p>
* The {@code path.separator} System Property. Path separator
* ({@code &quot;:&quot;} on UNIX).
* </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>
*
* @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 = getSystemProperty("path.separator");
/**
* <p>
* 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
* </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 2.0
* @since Java 1.2
*/
public static final String USER_COUNTRY = getSystemProperty("user.country") == null
? getSystemProperty("user.region")
: getSystemProperty("user.country");
/**
* <p>
* The {@code user.dir} System Property. User's current working directory.
* </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 Java 1.1
*/
public static final String USER_DIR = getSystemProperty(USER_DIR_KEY);
/**
* <p>
* The {@code user.home} System Property. User's home directory.
* </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 Java 1.1
*/
public static final String USER_HOME = getSystemProperty(USER_HOME_KEY);
/**
* <p>
* The {@code user.language} System Property. User's language code, such as
* {@code "en"}.
* </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 2.0
* @since Java 1.2
*/
public static final String USER_LANGUAGE = getSystemProperty("user.language");
/**
* <p>
* The {@code user.name} System Property. User's account name.
* </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 Java 1.1
*/
public static final String USER_NAME = getSystemProperty(USER_NAME_KEY);
/**
* <p>
* The {@code user.timezone} System Property. For example:
* {@code "America/Los_Angeles"}.
* </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
*/
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
/**
* <p>
* Is {@code true} if this is Java version 1.1 (also 1.1.x versions).
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}.
* </p>
*/
public static final boolean IS_JAVA_1_1 = getJavaVersionMatches("1.1");
/**
* <p>
* Is {@code true} if this is Java version 1.2 (also 1.2.x versions).
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}.
* </p>
*/
public static final boolean IS_JAVA_1_2 = getJavaVersionMatches("1.2");
/**
* <p>
* Is {@code true} if this is Java version 1.3 (also 1.3.x versions).
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}.
* </p>
*/
public static final boolean IS_JAVA_1_3 = getJavaVersionMatches("1.3");
/**
* <p>
* Is {@code true} if this is Java version 1.4 (also 1.4.x versions).
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}.
* </p>
*/
public static final boolean IS_JAVA_1_4 = getJavaVersionMatches("1.4");
/**
* <p>
* Is {@code true} if this is Java version 1.5 (also 1.5.x versions).
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}.
* </p>
*/
public static final boolean IS_JAVA_1_5 = getJavaVersionMatches("1.5");
/**
* <p>
* Is {@code true} if this is Java version 1.6 (also 1.6.x versions).
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}.
* </p>
*/
public static final boolean IS_JAVA_1_6 = getJavaVersionMatches("1.6");
/**
* <p>
* Is {@code true} if this is Java version 1.7 (also 1.7.x versions).
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}.
* </p>
*
* @since 3.0
*/
public static final boolean IS_JAVA_1_7 = getJavaVersionMatches("1.7");
/**
* <p>
* Is {@code true} if this is Java version 1.8 (also 1.8.x versions).
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}.
* </p>
*
* @since 3.3.2
*/
public static final boolean IS_JAVA_1_8 = getJavaVersionMatches("1.8");
/**
* <p>
* Is {@code true} if this is Java version 1.9 (also 1.9.x versions).
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}.
* </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");
/**
* <p>
* Is {@code true} if this is Java version 9 (also 9.x versions).
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}.
* </p>
*
* @since 3.5
*/
public static final boolean IS_JAVA_9 = getJavaVersionMatches("9");
/**
* <p>
* Is {@code true} if this is Java version 10 (also 10.x versions).
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}.
* </p>
*
* @since 3.7
*/
public static final boolean IS_JAVA_10 = getJavaVersionMatches("10");
/**
* <p>
* Is {@code true} if this is Java version 11 (also 11.x versions).
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}.
* </p>
*
* @since 3.8
*/
public static final boolean IS_JAVA_11 = getJavaVersionMatches("11");
/**
* <p>
* Is {@code true} if this is Java version 12 (also 12.x versions).
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}.
* </p>
*
* @since 3.9
*/
public static final boolean IS_JAVA_12 = getJavaVersionMatches("12");
/**
* <p>
* Is {@code true} if this is Java version 13 (also 13.x versions).
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}.
* </p>
*
* @since 3.9
*/
public static final boolean IS_JAVA_13 = getJavaVersionMatches("13");
/**
* <p>
* Is {@code true} if this is Java version 14 (also 14.x versions).
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}.
* </p>
*
* @since 3.10
*/
public static final boolean IS_JAVA_14 = getJavaVersionMatches("14");
/**
* <p>
* Is {@code true} if this is Java version 15 (also 15.x versions).
* </p>
* <p>
* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}.
* </p>
*
* @since 3.10
*/
public static final boolean IS_JAVA_15 = getJavaVersionMatches("15");
// Operating system checks
// -----------------------------------------------------------------------
// These MUST be declared after those above as they depend on the
// values being set up
// OS names from http://www.vamphq.com/os.html
// Selected ones included - please advise dev@commons.apache.org
// if you want another added or a mistake corrected
/**
* <p>
* Is {@code true} if this is AIX.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_AIX = getOsMatchesName("AIX");
/**
* <p>
* Is {@code true} if this is HP-UX.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_HP_UX = getOsMatchesName("HP-UX");
/**
* <p>
* Is {@code true} if this is IBM OS/400.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.3
*/
public static final boolean IS_OS_400 = getOsMatchesName("OS/400");
/**
* <p>
* Is {@code true} if this is Irix.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_IRIX = getOsMatchesName("Irix");
/**
* <p>
* Is {@code true} if this is Linux.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_LINUX = getOsMatchesName("Linux") || getOsMatchesName("LINUX");
/**
* <p>
* Is {@code true} if this is Mac.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_MAC = getOsMatchesName("Mac");
/**
* <p>
* Is {@code true} if this is Mac.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_MAC_OSX = getOsMatchesName("Mac OS X");
/**
* <p>
* Is {@code true} if this is Mac OS X Cheetah.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_CHEETAH = getOsMatches("Mac OS X", "10.0");
/**
* <p>
* Is {@code true} if this is Mac OS X Puma.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_PUMA = getOsMatches("Mac OS X", "10.1");
/**
* <p>
* Is {@code true} if this is Mac OS X Jaguar.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_JAGUAR = getOsMatches("Mac OS X", "10.2");
/**
* <p>
* Is {@code true} if this is Mac OS X Panther.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_PANTHER = getOsMatches("Mac OS X", "10.3");
/**
* <p>
* Is {@code true} if this is Mac OS X Tiger.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_TIGER = getOsMatches("Mac OS X", "10.4");
/**
* <p>
* Is {@code true} if this is Mac OS X Leopard.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_LEOPARD = getOsMatches("Mac OS X", "10.5");
/**
* <p>
* Is {@code true} if this is Mac OS X Snow Leopard.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_SNOW_LEOPARD = getOsMatches("Mac OS X", "10.6");
/**
* <p>
* Is {@code true} if this is Mac OS X Lion.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_LION = getOsMatches("Mac OS X", "10.7");
/**
* <p>
* Is {@code true} if this is Mac OS X Mountain Lion.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_MOUNTAIN_LION = getOsMatches("Mac OS X", "10.8");
/**
* <p>
* Is {@code true} if this is Mac OS X Mavericks.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_MAVERICKS = getOsMatches("Mac OS X", "10.9");
/**
* <p>
* Is {@code true} if this is Mac OS X Yosemite.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_MAC_OSX_YOSEMITE = getOsMatches("Mac OS X", "10.10");
/**
* <p>
* Is {@code true} if this is Mac OS X El Capitan.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.5
*/
public static final boolean IS_OS_MAC_OSX_EL_CAPITAN = getOsMatches("Mac OS X", "10.11");
/**
* <p>
* Is {@code true} if this is Mac OS X Sierra.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.12.0
*/
public static final boolean IS_OS_MAC_OSX_SIERRA = getOsMatches("Mac OS X", "10.12");
/**
* <p>
* Is {@code true} if this is Mac OS X High Sierra.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.12.0
*/
public static final boolean IS_OS_MAC_OSX_HIGH_SIERRA = getOsMatches("Mac OS X", "10.13");
/**
* <p>
* Is {@code true} if this is Mac OS X Mojave.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.12.0
*/
public static final boolean IS_OS_MAC_OSX_MOJAVE = getOsMatches("Mac OS X", "10.14");
/**
* <p>
* Is {@code true} if this is Mac OS X Catalina.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.12.0
*/
public static final boolean IS_OS_MAC_OSX_CATALINA = getOsMatches("Mac OS X", "10.15");
/**
* <p>
* Is {@code true} if this is Mac OS X Big Sur.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.12.0
*/
public static final boolean IS_OS_MAC_OSX_BIG_SUR = getOsMatches("Mac OS X", "10.16");
/**
* <p>
* Is {@code true} if this is FreeBSD.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.1
*/
public static final boolean IS_OS_FREE_BSD = getOsMatchesName("FreeBSD");
/**
* <p>
* Is {@code true} if this is OpenBSD.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.1
*/
public static final boolean IS_OS_OPEN_BSD = getOsMatchesName("OpenBSD");
/**
* <p>
* Is {@code true} if this is NetBSD.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.1
*/
public static final boolean IS_OS_NET_BSD = getOsMatchesName("NetBSD");
/**
* <p>
* Is {@code true} if this is OS/2.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_OS2 = getOsMatchesName("OS/2");
/**
* <p>
* Is {@code true} if this is Solaris.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_SOLARIS = getOsMatchesName("Solaris");
/**
* <p>
* Is {@code true} if this is SunOS.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_SUN_OS = getOsMatchesName("SunOS");
/**
* <p>
* Is {@code true} if this is a UNIX like system, as in any of AIX, HP-UX, Irix,
* Linux, MacOSX, Solaris or SUN OS.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </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;
/**
* <p>
* Is {@code true} if this is Windows.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS = getOsMatchesName(OS_NAME_WINDOWS_PREFIX);
/**
* <p>
* Is {@code true} if this is Windows 2000.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_2000 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " 2000");
/**
* <p>
* Is {@code true} if this is Windows 2003.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.1
*/
public static final boolean IS_OS_WINDOWS_2003 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " 2003");
/**
* <p>
* Is {@code true} if this is Windows Server 2008.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.1
*/
public static final boolean IS_OS_WINDOWS_2008 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " Server 2008");
/**
* <p>
* Is {@code true} if this is Windows Server 2012.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.4
*/
public static final boolean IS_OS_WINDOWS_2012 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " Server 2012");
/**
* <p>
* Is {@code true} if this is Windows 95.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_95 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " 95");
/**
* <p>
* Is {@code true} if this is Windows 98.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_98 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " 98");
/**
* <p>
* Is {@code true} if this is Windows ME.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_ME = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " Me");
/**
* <p>
* Is {@code true} if this is Windows NT.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_NT = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " NT");
/**
* <p>
* Is {@code true} if this is Windows XP.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_XP = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " XP");
// -----------------------------------------------------------------------
/**
* <p>
* Is {@code true} if this is Windows Vista.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 2.4
*/
public static final boolean IS_OS_WINDOWS_VISTA = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " Vista");
/**
* <p>
* Is {@code true} if this is Windows 7.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.0
*/
public static final boolean IS_OS_WINDOWS_7 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " 7");
/**
* <p>
* Is {@code true} if this is Windows 8.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.2
*/
public static final boolean IS_OS_WINDOWS_8 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " 8");
/**
* <p>
* Is {@code true} if this is Windows 10.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </p>
*
* @since 3.5
*/
public static final boolean IS_OS_WINDOWS_10 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " 10");
/**
* <p>
* Is {@code true} if this is z/OS.
* </p>
* <p>
* The field will return {@code false} if {@code OS_NAME} is {@code null}.
* </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 = getOsMatchesName("z/OS");
/**
* <p>
* Gets an environment variable, defaulting to {@code defaultValue} if the
* variable cannot be read.
* </p>
* <p>
* If a {@code 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 (COMPUTERNAME on Windows,
* 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");
}
/**
* <p>
* Decides if the Java version matches.
* </p>
*
* @param versionPrefix the prefix for the java version
* @return true if matches, or false if not or can't determine
*/
private static boolean getJavaVersionMatches(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);
}
// -----------------------------------------------------------------------
/**
* <p>
* Gets a System property, defaulting to {@code null} if the property cannot be
* read.
* </p>
* <p>
* If a {@code SecurityException} is caught, the return value is {@code null}
* and a message is written to {@code System.err}.
* </p>
*
* @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;
}
}
/**
* <p>
* Gets the 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 System#getProperty(String)
* @since 3.10
*/
public static String getUserName() {
return System.getProperty(USER_NAME_KEY);
}
/**
* <p>
* Gets the 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 System#getProperty(String)
* @since 3.10
*/
public static String getUserName(final String defaultValue) {
return System.getProperty(USER_NAME_KEY, defaultValue);
}
/**
* 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 Boolean.TRUE.toString().equals(JAVA_AWT_HEADLESS);
}
/**
* <p>
* Is the Java version at least the requested version.
* </p>
* <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.atLeast(requiredVersion);
}
/**
* <p>
* Is the Java version at most the requested version.
* </p>
* <p>
* Example input:
* </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.atMost(requiredVersion);
}
/**
* <p>
* Decides if the Java version matches.
* </p>
* <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);
}
/**
* Decides if 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);
}
/**
* Decides if 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 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);
}
/**
* Decides if 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 = osVersionPrefix.split("\\.");
final String[] versionParts = osVersion.split("\\.");
for (int i = 0; i < Math.min(versionPrefixParts.length, versionParts.length); i++) {
if (!versionPrefixParts[i].equals(versionParts[i])) {
return false;
}
}
return true;
}
// -----------------------------------------------------------------------
/**
* <p>
* SystemUtils instances should NOT be constructed in standard programming.
* Instead, the class should be used as {@code SystemUtils.FILE_SEPARATOR}.
* </p>
* <p>
* This constructor is public to permit tools that require a JavaBean instance
* to operate.
* </p>
*/
public SystemUtils() {
}
}
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