/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.lang3;
import java.io.
File;
/**
* <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 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>"\n"</code> 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>
*
* @since Java 1.1
*/
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>":"</code> 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");
/**
* <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");
// 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 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 the Java home directory as a {@code File}.
* </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 System#getProperty(String)
* @since 2.1
*/
public static
File getJavaHome() {
return new
File(
System.
getProperty(
JAVA_HOME_KEY));
}
/**
* <p>
* Gets the Java IO temporary directory as a {@code File}.
* </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 System#getProperty(String)
* @since 2.1
*/
public static
File getJavaIoTmpDir() {
return new
File(
System.
getProperty(
JAVA_IO_TMPDIR_KEY));
}
/**
* <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 directory as a {@code File}.
* </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 System#getProperty(String)
* @since 2.1
*/
public static
File getUserDir() {
return new
File(
System.
getProperty(
USER_DIR_KEY));
}
/**
* <p>
* Gets the user home directory as a {@code File}.
* </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 System#getProperty(String)
* @since 2.1
*/
public static
File getUserHome() {
return new
File(
System.
getProperty(
USER_HOME_KEY));
}
/**
* Returns whether the {@link #JAVA_AWT_HEADLESS} value is {@code true}.
*
* @return {@code true} if {@code JAVA_AWT_HEADLESS} is {@code "true"}, {@code false} otherwise.
* @see #JAVA_AWT_HEADLESS
* @since 2.1
* @since Java 1.4
*/
public static boolean
isJavaAwtHeadless() {
return
Boolean.
TRUE.
toString().
equals(
JAVA_AWT_HEADLESS);
}
/**
* <p>
* Is the Java version at least the requested version.
* </p>
* <p>
* Example input:
* </p>
* <ul>
* <li>{@code 1.2f} to test for Java 1.2</li>
* <li>{@code 1.31f} to test for Java 1.3.1</li>
* </ul>
*
* @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>
* 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
String[]
versionPrefixParts =
osVersionPrefix.
split("\\.");
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() {
super();
}
}