commons-lang-2.6.jar - Apache Commons Lang
commons-lang-2.6.jar is the JAR file for Apache Commons Lang 2.6, which
provides a host of helper utilities for the java.lang API.
JAR File Size and Download Location:
File name: commons-lang-2.6.jar File size: 284220 bytes Date modified: 01/13/2011 Download: Apache Commons Lang Website
✍: FYIcenter
⏎ org/apache/commons/lang/SystemUtils.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* 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.lang;
import java.io.File;
/**
* <p>
* Helpers for <code>java.lang.System</code>.
* </p>
*
* <p>
* If a system property cannot be read due to security restrictions,
* the corresponding field in this class will be set to <code>null</code>
* and a message will be written to <code>System.err</code>.
* </p>
*
* <p>
* #ThreadSafe#
* </p>
*
* @author Apache Software Foundation
* @author Based on code from Avalon Excalibur
* @author Based on code from Lucene
* @author <a href="mailto:sdowney@panix.com">Steve Downey</a>
* @author Gary Gregory
* @author Michael Becke
* @author Tetsuya Kaneuchi
* @author Rafal Krupinski
* @author Jason Gritman
* @since 1.0
* @version $Id: SystemUtils.java 1056988 2011-01-09 17:58:53Z niallp $
*/
public class SystemUtils {
private static final int JAVA_VERSION_TRIM_SIZE = 3;
/**
* The prefix String for all Windows OS.
*/
private static final String OS_NAME_WINDOWS_PREFIX = "Windows";
// System property constants
// -----------------------------------------------------------------------
// These MUST be declared first. Other constants depend on this.
/**
* The System property key for the user home directory.
*/
private static final String USER_HOME_KEY = "user.home";
/**
* The System property key for the user directory.
*/
private static final String USER_DIR_KEY = "user.dir";
/**
* The System property key for the Java IO temporary directory.
*/
private static final String JAVA_IO_TMPDIR_KEY = "java.io.tmpdir";
/**
* The System property key for the Java home directory.
*/
private static final String JAVA_HOME_KEY = "java.home";
/**
* <p>
* The <code>awt.toolkit</code> System Property.
* </p>
* <p>
* Holds a class name, on Windows XP this is <code>sun.awt.windows.WToolkit</code>.
* </p>
* <p>
* <b>On platforms without a GUI, this value is <code>null</code>.</b>
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will
* be out of sync with that System property.
* </p>
*
* @since 2.1
*/
public static final String AWT_TOOLKIT = getSystemProperty("awt.toolkit");
/**
* <p>
* The <code>file.encoding</code> System Property.
* </p>
* <p>
* File encoding, such as <code>Cp1252</code>.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since 2.0
* @since Java 1.2
*/
public static final String FILE_ENCODING = getSystemProperty("file.encoding");
/**
* <p>
* The <code>file.separator</code> System Property. File separator (<code>"/"</code> on UNIX).
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.1
*/
public static final String FILE_SEPARATOR = getSystemProperty("file.separator");
/**
* <p>
* The <code>java.awt.fonts</code> System Property.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since 2.1
*/
public static final String JAVA_AWT_FONTS = getSystemProperty("java.awt.fonts");
/**
* <p>
* The <code>java.awt.graphicsenv</code> System Property.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since 2.1
*/
public static final String JAVA_AWT_GRAPHICSENV = getSystemProperty("java.awt.graphicsenv");
/**
* <p>
* The <code>java.awt.headless</code> System Property.
* The value of this property is the String <code>"true"</code> or <code>"false"</code>.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @see #isJavaAwtHeadless()
* @since 2.1
* @since Java 1.4
*/
public static final String JAVA_AWT_HEADLESS = getSystemProperty("java.awt.headless");
/**
* <p>
* The <code>java.awt.printerjob</code> System Property.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since 2.1
*/
public static final String JAVA_AWT_PRINTERJOB = getSystemProperty("java.awt.printerjob");
/**
* <p>
* The <code>java.class.path</code> System Property. Java class path.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.1
*/
public static final String JAVA_CLASS_PATH = getSystemProperty("java.class.path");
/**
* <p>
* The <code>java.class.version</code> System Property. Java class format version number.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.1
*/
public static final String JAVA_CLASS_VERSION = getSystemProperty("java.class.version");
/**
* <p>
* The <code>java.compiler</code> System Property. Name of JIT compiler to use.
* First in JDK version 1.2. Not used in Sun JDKs after 1.2.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.2. Not used in Sun versions after 1.2.
*/
public static final String JAVA_COMPILER = getSystemProperty("java.compiler");
/**
* <p>
* The <code>java.endorsed.dirs</code> System Property. Path of endorsed directory or directories.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.4
*/
public static final String JAVA_ENDORSED_DIRS = getSystemProperty("java.endorsed.dirs");
/**
* <p>
* The <code>java.ext.dirs</code> System Property. Path of extension directory or directories.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.3
*/
public static final String JAVA_EXT_DIRS = getSystemProperty("java.ext.dirs");
/**
* <p>
* The <code>java.home</code> System Property. Java installation directory.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.1
*/
public static final String JAVA_HOME = getSystemProperty(JAVA_HOME_KEY);
/**
* <p>
* The <code>java.io.tmpdir</code> System Property. Default temp file path.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.2
*/
public static final String JAVA_IO_TMPDIR = getSystemProperty(JAVA_IO_TMPDIR_KEY);
/**
* <p>
* The <code>java.library.path</code> System Property. List of paths to search when loading libraries.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.2
*/
public static final String JAVA_LIBRARY_PATH = getSystemProperty("java.library.path");
/**
* <p>
* The <code>java.runtime.name</code> System Property. Java Runtime Environment name.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since 2.0
* @since Java 1.3
*/
public static final String JAVA_RUNTIME_NAME = getSystemProperty("java.runtime.name");
/**
* <p>
* The <code>java.runtime.version</code> System Property. Java Runtime Environment version.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since 2.0
* @since Java 1.3
*/
public static final String JAVA_RUNTIME_VERSION = getSystemProperty("java.runtime.version");
/**
* <p>
* The <code>java.specification.name</code> System Property. Java Runtime Environment specification name.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.2
*/
public static final String JAVA_SPECIFICATION_NAME = getSystemProperty("java.specification.name");
/**
* <p>
* The <code>java.specification.vendor</code> System Property. Java Runtime Environment specification vendor.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.2
*/
public static final String JAVA_SPECIFICATION_VENDOR = getSystemProperty("java.specification.vendor");
/**
* <p>
* The <code>java.specification.version</code> System Property. Java Runtime Environment specification version.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.3
*/
public static final String JAVA_SPECIFICATION_VERSION = getSystemProperty("java.specification.version");
/**
* <p>
* The <code>java.util.prefs.PreferencesFactory</code> System Property. A class name.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since 2.1
* @since Java 1.4
*/
public static final String JAVA_UTIL_PREFS_PREFERENCES_FACTORY =
getSystemProperty("java.util.prefs.PreferencesFactory");
/**
* <p>
* The <code>java.vendor</code> System Property. Java vendor-specific string.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.1
*/
public static final String JAVA_VENDOR = getSystemProperty("java.vendor");
/**
* <p>
* The <code>java.vendor.url</code> System Property. Java vendor URL.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.1
*/
public static final String JAVA_VENDOR_URL = getSystemProperty("java.vendor.url");
/**
* <p>
* The <code>java.version</code> System Property. Java version number.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.1
*/
public static final String JAVA_VERSION = getSystemProperty("java.version");
/**
* <p>
* The <code>java.vm.info</code> System Property. Java Virtual Machine implementation info.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since 2.0
* @since Java 1.2
*/
public static final String JAVA_VM_INFO = getSystemProperty("java.vm.info");
/**
* <p>
* The <code>java.vm.name</code> System Property. Java Virtual Machine implementation name.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.2
*/
public static final String JAVA_VM_NAME = getSystemProperty("java.vm.name");
/**
* <p>
* The <code>java.vm.specification.name</code> System Property. Java Virtual Machine specification name.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.2
*/
public static final String JAVA_VM_SPECIFICATION_NAME = getSystemProperty("java.vm.specification.name");
/**
* <p>
* The <code>java.vm.specification.vendor</code> System Property. Java Virtual Machine specification vendor.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.2
*/
public static final String JAVA_VM_SPECIFICATION_VENDOR = getSystemProperty("java.vm.specification.vendor");
/**
* <p>
* The <code>java.vm.specification.version</code> System Property. Java Virtual Machine specification version.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.2
*/
public static final String JAVA_VM_SPECIFICATION_VERSION = getSystemProperty("java.vm.specification.version");
/**
* <p>
* The <code>java.vm.vendor</code> System Property. Java Virtual Machine implementation vendor.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.2
*/
public static final String JAVA_VM_VENDOR = getSystemProperty("java.vm.vendor");
/**
* <p>
* The <code>java.vm.version</code> System Property. Java Virtual Machine implementation version.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.2
*/
public static final String JAVA_VM_VERSION = getSystemProperty("java.vm.version");
/**
* <p>
* The <code>line.separator</code> System Property. Line separator (<code>"\n"</code> on UNIX).
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.1
*/
public static final String LINE_SEPARATOR = getSystemProperty("line.separator");
/**
* <p>
* The <code>os.arch</code> System Property. Operating system architecture.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.1
*/
public static final String OS_ARCH = getSystemProperty("os.arch");
/**
* <p>
* The <code>os.name</code> System Property. Operating system name.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.1
*/
public static final String OS_NAME = getSystemProperty("os.name");
/**
* <p>
* The <code>os.version</code> System Property. Operating system version.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.1
*/
public static final String OS_VERSION = getSystemProperty("os.version");
/**
* <p>
* The <code>path.separator</code> System Property. Path separator (<code>":"</code> on UNIX).
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.1
*/
public static final String PATH_SEPARATOR = getSystemProperty("path.separator");
/**
* <p>
* The <code>user.country</code> or <code>user.region</code> System Property.
* User's country code, such as <code>GB</code>. First in
* Java version 1.2 as <code>user.region</code>. Renamed to <code>user.country</code> in 1.4
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since 2.0
* @since Java 1.2
*/
public static final String USER_COUNTRY =
getSystemProperty("user.country") == null ?
getSystemProperty("user.region") : getSystemProperty("user.country");
/**
* <p>
* The <code>user.dir</code> System Property. User's current working directory.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.1
*/
public static final String USER_DIR = getSystemProperty(USER_DIR_KEY);
/**
* <p>
* The <code>user.home</code> System Property. User's home directory.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.1
*/
public static final String USER_HOME = getSystemProperty(USER_HOME_KEY);
/**
* <p>
* The <code>user.language</code> System Property. User's language code, such as <code>"en"</code>.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since 2.0
* @since Java 1.2
*/
public static final String USER_LANGUAGE = getSystemProperty("user.language");
/**
* <p>
* The <code>user.name</code> System Property. User's account name.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since Java 1.1
*/
public static final String USER_NAME = getSystemProperty("user.name");
/**
* <p>
* The <code>user.timezone</code> System Property. For example: <code>"America/Los_Angeles"</code>.
* </p>
*
* <p>
* Defaults to <code>null</code> if the runtime does not have
* security access to read this property or the property does not exist.
* </p>
*
* <p>
* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or
* {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
* will be out of sync with that System property.
* </p>
*
* @since 2.1
*/
public static final String USER_TIMEZONE = getSystemProperty("user.timezone");
// Java version
// -----------------------------------------------------------------------
// This MUST be declared after those above as it depends on the
// values being set up
/**
* <p>
* Gets the Java version as a <code>String</code> trimming leading letters.
* </p>
*
* <p>
* The field will return <code>null</code> if {@link #JAVA_VERSION} is <code>null</code>.
* </p>
*
* @since 2.1
*/
public static final String JAVA_VERSION_TRIMMED = getJavaVersionTrimmed();
// Java version values
// -----------------------------------------------------------------------
// These MUST be declared after the trim above as they depend on the
// value being set up
/**
* <p>
* Gets the Java version as a <code>float</code>.
* </p>
*
* <p>
* Example return values:
* </p>
* <ul>
* <li><code>1.2f</code> for Java 1.2
* <li><code>1.31f</code> for Java 1.3.1
* </ul>
*
* <p>
* The field will return zero if {@link #JAVA_VERSION} is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final float JAVA_VERSION_FLOAT = getJavaVersionAsFloat();
/**
* <p>
* Gets the Java version as an <code>int</code>.
* </p>
*
* <p>
* Example return values:
* </p>
* <ul>
* <li><code>120</code> for Java 1.2
* <li><code>131</code> for Java 1.3.1
* </ul>
*
* <p>
* The field will return zero if {@link #JAVA_VERSION} is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final int JAVA_VERSION_INT = getJavaVersionAsInt();
// Java version checks
// -----------------------------------------------------------------------
// These MUST be declared after those above as they depend on the
// values being set up
/**
* <p>
* Is <code>true</code> if this is Java version 1.1 (also 1.1.x versions).
* </p>
*
* <p>
* The field will return <code>false</code> if {@link #JAVA_VERSION} is <code>null</code>.
* </p>
*/
public static final boolean IS_JAVA_1_1 = getJavaVersionMatches("1.1");
/**
* <p>
* Is <code>true</code> if this is Java version 1.2 (also 1.2.x versions).
* </p>
*
* <p>
* The field will return <code>false</code> if {@link #JAVA_VERSION} is <code>null</code>.
* </p>
*/
public static final boolean IS_JAVA_1_2 = getJavaVersionMatches("1.2");
/**
* <p>
* Is <code>true</code> if this is Java version 1.3 (also 1.3.x versions).
* </p>
*
* <p>
* The field will return <code>false</code> if {@link #JAVA_VERSION} is <code>null</code>.
* </p>
*/
public static final boolean IS_JAVA_1_3 = getJavaVersionMatches("1.3");
/**
* <p>
* Is <code>true</code> if this is Java version 1.4 (also 1.4.x versions).
* </p>
*
* <p>
* The field will return <code>false</code> if {@link #JAVA_VERSION} is <code>null</code>.
* </p>
*/
public static final boolean IS_JAVA_1_4 = getJavaVersionMatches("1.4");
/**
* <p>
* Is <code>true</code> if this is Java version 1.5 (also 1.5.x versions).
* </p>
*
* <p>
* The field will return <code>false</code> if {@link #JAVA_VERSION} is <code>null</code>.
* </p>
*/
public static final boolean IS_JAVA_1_5 = getJavaVersionMatches("1.5");
/**
* <p>
* Is <code>true</code> if this is Java version 1.6 (also 1.6.x versions).
* </p>
*
* <p>
* The field will return <code>false</code> if {@link #JAVA_VERSION} is <code>null</code>.
* </p>
*/
public static final boolean IS_JAVA_1_6 = getJavaVersionMatches("1.6");
/**
* <p>
* Is <code>true</code> if this is Java version 1.7 (also 1.7.x versions).
* </p>
*
* <p>
* The field will return <code>false</code> if {@link #JAVA_VERSION} is <code>null</code>.
* </p>
*
* @since 2.5
*/
public static final boolean IS_JAVA_1_7 = getJavaVersionMatches("1.7");
// Operating system checks
// -----------------------------------------------------------------------
// These MUST be declared after those above as they depend on the
// values being set up
// OS names from http://www.vamphq.com/os.html
// Selected ones included - please advise dev@commons.apache.org
// if you want another added or a mistake corrected
/**
* <p>
* Is <code>true</code> if this is AIX.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_AIX = getOSMatchesName("AIX");
/**
* <p>
* Is <code>true</code> if this is HP-UX.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_HP_UX = getOSMatchesName("HP-UX");
/**
* <p>
* Is <code>true</code> if this is Irix.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_IRIX = getOSMatchesName("Irix");
/**
* <p>
* Is <code>true</code> if this is Linux.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_LINUX = getOSMatchesName("Linux") || getOSMatchesName("LINUX");
/**
* <p>
* Is <code>true</code> if this is Mac.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_MAC = getOSMatchesName("Mac");
/**
* <p>
* Is <code>true</code> if this is Mac.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_MAC_OSX = getOSMatchesName("Mac OS X");
/**
* <p>
* Is <code>true</code> if this is OS/2.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_OS2 = getOSMatchesName("OS/2");
/**
* <p>
* Is <code>true</code> if this is Solaris.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_SOLARIS = getOSMatchesName("Solaris");
/**
* <p>
* Is <code>true</code> if this is SunOS.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_SUN_OS = getOSMatchesName("SunOS");
/**
* <p>
* Is <code>true</code> 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</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.1
*/
public static final boolean IS_OS_UNIX =
IS_OS_AIX || IS_OS_HP_UX || IS_OS_IRIX || IS_OS_LINUX ||
IS_OS_MAC_OSX || IS_OS_SOLARIS || IS_OS_SUN_OS;
/**
* <p>
* Is <code>true</code> if this is Windows.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS = getOSMatchesName(OS_NAME_WINDOWS_PREFIX);
/**
* <p>
* Is <code>true</code> if this is Windows 2000.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_2000 = getOSMatches(OS_NAME_WINDOWS_PREFIX, "5.0");
/**
* <p>
* Is <code>true</code> if this is Windows 95.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_95 = getOSMatches(OS_NAME_WINDOWS_PREFIX + " 9", "4.0");
// Java 1.2 running on Windows98 returns 'Windows 95', hence the above
/**
* <p>
* Is <code>true</code> if this is Windows 98.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_98 = getOSMatches(OS_NAME_WINDOWS_PREFIX + " 9", "4.1");
// Java 1.2 running on Windows98 returns 'Windows 95', hence the above
/**
* <p>
* Is <code>true</code> if this is Windows ME.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_ME = getOSMatches(OS_NAME_WINDOWS_PREFIX, "4.9");
// Java 1.2 running on WindowsME may return 'Windows 95', hence the above
/**
* <p>
* Is <code>true</code> if this is Windows NT.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_NT = getOSMatchesName(OS_NAME_WINDOWS_PREFIX + " NT");
// Windows 2000 returns 'Windows 2000' but may suffer from same Java1.2 problem
/**
* <p>
* Is <code>true</code> if this is Windows XP.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.0
*/
public static final boolean IS_OS_WINDOWS_XP = getOSMatches(OS_NAME_WINDOWS_PREFIX, "5.1");
// -----------------------------------------------------------------------
/**
* <p>
* Is <code>true</code> if this is Windows Vista.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.4
*/
public static final boolean IS_OS_WINDOWS_VISTA = getOSMatches(OS_NAME_WINDOWS_PREFIX, "6.0");
/**
* <p>
* Is <code>true</code> if this is Windows 7.
* </p>
*
* <p>
* The field will return <code>false</code> if <code>OS_NAME</code> is <code>null</code>.
* </p>
*
* @since 2.5
*/
public static final boolean IS_OS_WINDOWS_7 = getOSMatches(OS_NAME_WINDOWS_PREFIX, "6.1");
/**
* <p>
* Gets the Java home directory as a <code>File</code>.
* </p>
*
* @return a directory
* @throws SecurityException if a security manager exists and its
* <code>checkPropertyAccess</code> method doesn't allow access to the specified system property.
* @see System#getProperty(String)
* @since 2.1
*/
public static File getJavaHome() {
return new File(System.getProperty(JAVA_HOME_KEY));
}
/**
* <p>
* Gets the Java IO temporary directory as a <code>File</code>.
* </p>
*
* @return a directory
* @throws SecurityException if a security manager exists and its
* <code>checkPropertyAccess</code> method doesn't allow access to the specified system
* property.
* @see System#getProperty(String)
* @since 2.1
*/
public static File getJavaIoTmpDir() {
return new File(System.getProperty(JAVA_IO_TMPDIR_KEY));
}
/**
* <p>Gets the Java version number as a <code>float</code>.</p>
*
* <p>Example return values:</p>
* <ul>
* <li><code>1.2f</code> for JDK 1.2
* <li><code>1.31f</code> for JDK 1.3.1
* </ul>
*
* @return the version, for example 1.31f for JDK 1.3.1
* @deprecated Use {@link #JAVA_VERSION_FLOAT} instead.
* Method will be removed in Commons Lang 3.0.
*/
public static float getJavaVersion() {
return JAVA_VERSION_FLOAT;
}
/**
* <p>
* Gets the Java version number as a <code>float</code>.
* </p>
*
* <p>
* Example return values:
* </p>
* <ul>
* <li><code>1.2f</code> for Java 1.2</li>
* <li><code>1.31f</code> for Java 1.3.1</li>
* <li><code>1.6f</code> for Java 1.6.0_20</li>
* </ul>
*
* <p>
* Patch releases are not reported.
* </p>
*
* @return the version, for example 1.31f for Java 1.3.1
*/
private static float getJavaVersionAsFloat() {
return toVersionFloat(toJavaVersionIntArray(SystemUtils.JAVA_VERSION, JAVA_VERSION_TRIM_SIZE));
}
/**
* <p>
* Gets the Java version number as an <code>int</code>.
* </p>
*
* <p>
* Example return values:
* </p>
* <ul>
* <li><code>120</code> for Java 1.2</li>
* <li><code>131</code> for Java 1.3.1</li>
* <li><code>160</code> for Java 1.6.0_20</li>
* </ul>
*
* <p>
* Patch releases are not reported.
* </p>
*
* @return the version, for example 131 for Java 1.3.1
*/
private static int getJavaVersionAsInt() {
return toVersionInt(toJavaVersionIntArray(SystemUtils.JAVA_VERSION, JAVA_VERSION_TRIM_SIZE));
}
/**
* <p>
* Decides if the Java version matches.
* </p>
*
* @param versionPrefix
* the prefix for the java version
* @return true if matches, or false if not or can't determine
*/
private static boolean getJavaVersionMatches(String versionPrefix) {
return isJavaVersionMatch(JAVA_VERSION_TRIMMED, versionPrefix);
}
/**
* Trims the text of the java version to start with numbers.
*
* @return the trimmed java version
*/
private static String getJavaVersionTrimmed() {
if (JAVA_VERSION != null) {
for (int i = 0; i < JAVA_VERSION.length(); i++) {
char ch = JAVA_VERSION.charAt(i);
if (ch >= '0' && ch <= '9') {
return JAVA_VERSION.substring(i);
}
}
}
return null;
}
/**
* 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(String osNamePrefix, 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(String osNamePrefix) {
return isOSNameMatch(OS_NAME, osNamePrefix);
}
// -----------------------------------------------------------------------
/**
* <p>
* Gets a System property, defaulting to <code>null</code> if the property cannot be read.
* </p>
*
* <p>
* If a <code>SecurityException</code> is caught, the return value is <code>null</code> and a message is written to
* <code>System.err</code>.
* </p>
*
* @param property
* the system property name
* @return the system property value or <code>null</code> if a security problem occurs
*/
private static String getSystemProperty(String property) {
try {
return System.getProperty(property);
} catch (SecurityException ex) {
// we are not allowed to look at this property
System.err.println("Caught a SecurityException reading the system property '" + property
+ "'; the SystemUtils property value will default to null.");
return null;
}
}
/**
* <p>
* Gets the user directory as a <code>File</code>.
* </p>
*
* @return a directory
* @throws SecurityException if a security manager exists and its
* <code>checkPropertyAccess</code> method doesn't allow access to the specified system property.
* @see System#getProperty(String)
* @since 2.1
*/
public static File getUserDir() {
return new File(System.getProperty(USER_DIR_KEY));
}
/**
* <p>
* Gets the user home directory as a <code>File</code>.
* </p>
*
* @return a directory
* @throws SecurityException if a security manager exists and its
* <code>checkPropertyAccess</code> method doesn't allow access to the specified system property.
* @see System#getProperty(String)
* @since 2.1
*/
public static File getUserHome() {
return new File(System.getProperty(USER_HOME_KEY));
}
/**
* Returns whether the {@link #JAVA_AWT_HEADLESS} value is <code>true</code>.
*
* @return <code>true</code> if <code>JAVA_AWT_HEADLESS</code> is <code>"true"</code>, <code>false</code> otherwise.
*
* @see #JAVA_AWT_HEADLESS
* @since 2.1
* @since Java 1.4
*/
public static boolean isJavaAwtHeadless() {
return JAVA_AWT_HEADLESS != null ? JAVA_AWT_HEADLESS.equals(Boolean.TRUE.toString()) : false;
}
/**
* <p>
* Is the Java version at least the requested version.
* </p>
*
* <p>
* Example input:
* </p>
* <ul>
* <li><code>1.2f</code> to test for Java 1.2</li>
* <li><code>1.31f</code> to test for Java 1.3.1</li>
* </ul>
*
* @param requiredVersion
* the required version, for example 1.31f
* @return <code>true</code> if the actual version is equal or greater than the required version
*/
public static boolean isJavaVersionAtLeast(float requiredVersion) {
return JAVA_VERSION_FLOAT >= requiredVersion;
}
/**
* <p>
* Is the Java version at least the requested version.
* </p>
*
* <p>
* Example input:
* </p>
* <ul>
* <li><code>120</code> to test for Java 1.2 or greater</li>
* <li><code>131</code> to test for Java 1.3.1 or greater</li>
* </ul>
*
* @param requiredVersion
* the required version, for example 131
* @return <code>true</code> if the actual version is equal or greater than the required version
* @since 2.0
*/
public static boolean isJavaVersionAtLeast(int requiredVersion) {
return JAVA_VERSION_INT >= requiredVersion;
}
/**
* <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(String version, 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(String osName, String osVersion, String osNamePrefix, String osVersionPrefix) {
if (osName == null || osVersion == null) {
return false;
}
return osName.startsWith(osNamePrefix) && osVersion.startsWith(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(String osName, String osNamePrefix) {
if (osName == null) {
return false;
}
return osName.startsWith(osNamePrefix);
}
/**
* <p>
* Converts the given Java version string to a <code>float</code>.
* </p>
*
* <p>
* Example return values:
* </p>
* <ul>
* <li><code>1.2f</code> for Java 1.2</li>
* <li><code>1.31f</code> for Java 1.3.1</li>
* <li><code>1.6f</code> for Java 1.6.0_20</li>
* </ul>
*
* <p>
* Patch releases are not reported.
* </p>
* <p>
* This method is package private instead of private to support unit test invocation.
* </p>
*
* @param version The string version
* @return the version, for example 1.31f for Java 1.3.1
*/
static float toJavaVersionFloat(String version) {
return toVersionFloat(toJavaVersionIntArray(version, JAVA_VERSION_TRIM_SIZE));
}
/**
* <p>
* Converts the given Java version string to an <code>int</code>.
* </p>
*
* <p>
* Example return values:
* </p>
* <ul>
* <li><code>120</code> for Java 1.2</li>
* <li><code>131</code> for Java 1.3.1</li>
* <li><code>160</code> for Java 1.6.0_20</li>
* </ul>
*
* <p>
* Patch releases are not reported.
* </p>
* <p>
* This method is package private instead of private to support unit test invocation.
* </p>
*
* @param version The string version
* @return the version, for example 131 for Java 1.3.1
*/
static int toJavaVersionInt(String version) {
return toVersionInt(toJavaVersionIntArray(version, JAVA_VERSION_TRIM_SIZE));
}
/**
* <p>
* Converts the given Java version string to an <code>int[]</code> of maximum size <code>3</code>.
* </p>
*
* <p>
* Example return values:
* </p>
* <ul>
* <li><code>[1, 2, 0]</code> for Java 1.2</li>
* <li><code>[1, 3, 1]</code> for Java 1.3.1</li>
* <li><code>[1, 5, 0]</code> for Java 1.5.0_21</li>
* </ul>
* <p>
* This method is package private instead of private to support unit test invocation.
* </p>
*
* @param version The string version
* @return the version, for example [1, 5, 0] for Java 1.5.0_21
*/
static int[] toJavaVersionIntArray(String version) {
return toJavaVersionIntArray(version, Integer.MAX_VALUE);
}
/**
* <p>
* Converts the given Java version string to an <code>int[]</code> of maximum size <code>limit</code>.
* </p>
*
* <p>
* Example return values:
* </p>
* <ul>
* <li><code>[1, 2, 0]</code> for Java 1.2</li>
* <li><code>[1, 3, 1]</code> for Java 1.3.1</li>
* <li><code>[1, 5, 0, 21]</code> for Java 1.5.0_21</li>
* </ul>
*
* @param version The string version
* @param limit version limit
* @return the version, for example [1, 5, 0, 21] for Java 1.5.0_21
*/
private static int[] toJavaVersionIntArray(String version, int limit) {
if (version == null) {
return ArrayUtils.EMPTY_INT_ARRAY;
}
String[] strings = StringUtils.split(version, "._- ");
int[] ints = new int[Math.min(limit, strings.length)];
int j = 0;
for (int i = 0; i < strings.length && j < limit; i++) {
String s = strings[i];
if (s.length() > 0) {
try {
ints[j] = Integer.parseInt(s);
j++;
} catch (Exception e) {
}
}
}
if (ints.length > j) {
int[] newInts = new int[j];
System.arraycopy(ints, 0, newInts, 0, j);
ints = newInts;
}
return ints;
}
/**
* <p>
* Converts given the Java version array to a <code>float</code>.
* </p>
*
* <p>
* Example return values:
* </p>
* <ul>
* <li><code>1.2f</code> for Java 1.2</li>
* <li><code>1.31f</code> for Java 1.3.1</li>
* <li><code>1.6f</code> for Java 1.6.0_20</li>
* </ul>
*
* <p>
* Patch releases are not reported.
* </p>
*
* @param javaVersions The version numbers
* @return the version, for example 1.31f for Java 1.3.1
*/
private static float toVersionFloat(int[] javaVersions) {
if (javaVersions == null || javaVersions.length == 0) {
return 0f;
}
if (javaVersions.length == 1) {
return javaVersions[0];
}
StringBuffer builder = new StringBuffer();
builder.append(javaVersions[0]);
builder.append('.');
for (int i = 1; i < javaVersions.length; i++) {
builder.append(javaVersions[i]);
}
try {
return Float.parseFloat(builder.toString());
} catch (Exception ex) {
return 0f;
}
}
/**
* <p>
* Converts given the Java version array to an <code>int</code>.
* </p>
*
* <p>
* Example return values:
* </p>
* <ul>
* <li><code>120</code> for Java 1.2</li>
* <li><code>131</code> for Java 1.3.1</li>
* <li><code>160</code> for Java 1.6.0_20</li>
* </ul>
*
* <p>
* Patch releases are not reported.
* </p>
*
* @param javaVersions The version numbers
* @return the version, for example 1.31f for Java 1.3.1
*/
private static int toVersionInt(int[] javaVersions) {
if (javaVersions == null) {
return 0;
}
int intVersion = 0;
int len = javaVersions.length;
if (len >= 1) {
intVersion = javaVersions[0] * 100;
}
if (len >= 2) {
intVersion += javaVersions[1] * 10;
}
if (len >= 3) {
intVersion += javaVersions[2];
}
return intVersion;
}
// -----------------------------------------------------------------------
/**
* <p>
* SystemUtils instances should NOT be constructed in standard programming. Instead, the class should be used as
* <code>SystemUtils.FILE_SEPARATOR</code>.
* </p>
*
* <p>
* This constructor is public to permit tools that require a JavaBean instance to operate.
* </p>
*/
public SystemUtils() {
super();
}
}
⏎ org/apache/commons/lang/SystemUtils.java
⇒ commons-lang-1.0.1.jar - Apache Commons Lang
⇐ What Is commons-lang3-3.1.jar
2009-12-24, 80003👍, 0💬
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