Java tutorial
/* * 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.vfs2.util; import java.util.ArrayList; import java.util.HashSet; import java.util.List; import java.util.Locale; import java.util.Set; /** * Class to help determining the OS. */ public final class Os { /** * All Windows based OSes. */ public static final OsFamily OS_FAMILY_WINDOWS = new OsFamily("windows"); /** * All DOS based OSes. */ public static final OsFamily OS_FAMILY_DOS = new OsFamily("dos"); /** * All Windows NT based OSes. */ public static final OsFamily OS_FAMILY_WINNT = new OsFamily("nt", new OsFamily[] { OS_FAMILY_WINDOWS }); /** * All Windows 9x based OSes. */ public static final OsFamily OS_FAMILY_WIN9X = new OsFamily("win9x", new OsFamily[] { OS_FAMILY_WINDOWS, OS_FAMILY_DOS }); /** * OS/2. */ public static final OsFamily OS_FAMILY_OS2 = new OsFamily("os/2", new OsFamily[] { OS_FAMILY_DOS }); /** * Netware. */ public static final OsFamily OS_FAMILY_NETWARE = new OsFamily("netware"); /** * All UNIX based OSes. */ public static final OsFamily OS_FAMILY_UNIX = new OsFamily("unix"); /** * All Mac based OSes. */ public static final OsFamily OS_FAMILY_MAC = new OsFamily("mac"); /** * OSX. */ public static final OsFamily OS_FAMILY_OSX = new OsFamily("osx", new OsFamily[] { OS_FAMILY_UNIX, OS_FAMILY_MAC }); private static final String OS_NAME = System.getProperty("os.name").toLowerCase(Locale.US); private static final String OS_ARCH = System.getProperty("os.arch").toLowerCase(Locale.US); private static final String OS_VERSION = System.getProperty("os.version").toLowerCase(Locale.US); private static final String PATH_SEP = System.getProperty("path.separator"); private static final OsFamily OS_FAMILY; private static final OsFamily[] OS_ALL_FAMILIES; private static final OsFamily[] ALL_FAMILIES = new OsFamily[] { OS_FAMILY_DOS, OS_FAMILY_MAC, OS_FAMILY_NETWARE, OS_FAMILY_OS2, OS_FAMILY_OSX, OS_FAMILY_UNIX, OS_FAMILY_WINDOWS, OS_FAMILY_WINNT, OS_FAMILY_WIN9X }; static { OS_FAMILY = determineOsFamily(); OS_ALL_FAMILIES = determineAllFamilies(); } /** * Private constructor to block instantiation. */ private Os() { } /** * Determines if the OS on which Ant is executing matches the given OS * version. * @param version The version to check. * @return true if the version matches. */ public static boolean isVersion(final String version) { return isOs((OsFamily) null, null, null, version); } /** * Determines if the OS on which Ant is executing matches the given OS * architecture. * @param arch The architecture to check. * @return true if the architecture mataches. */ public static boolean isArch(final String arch) { return isOs((OsFamily) null, null, arch, null); } /** * Determines if the OS on which Ant is executing matches the given OS * family. * @param family The family to check. * @return true if the family matches. */ public static boolean isFamily(final String family) { return isOs(family, null, null, null); } /** * Determines if the OS on which Ant is executing matches the given OS * family. * @param family The family to check. * @return true if the family matches. */ public static boolean isFamily(final OsFamily family) { return isOs(family, null, null, null); } /** * Determines if the OS on which Ant is executing matches the given OS name. * * @param name Description of Parameter * @return The Name value * @since 1.7 */ public static boolean isName(final String name) { return isOs((OsFamily) null, name, null, null); } /** * Determines if the OS on which Ant is executing matches the given OS * family, name, architecture and version. * * @param family The OS family * @param name The OS name * @param arch The OS architecture * @param version The OS version * @return The Os value */ public static boolean isOs(final String family, final String name, final String arch, final String version) { return isOs(getFamily(family), name, arch, version); } /** * Determines if the OS on which Ant is executing matches the given OS * family, name, architecture and version. * * @param family The OS family * @param name The OS name * @param arch The OS architecture * @param version The OS version * @return The Os value */ public static boolean isOs(final OsFamily family, final String name, final String arch, final String version) { if (family != null || name != null || arch != null || version != null) { final boolean isFamily = familyMatches(family); final boolean isName = nameMatches(name); final boolean isArch = archMatches(arch); final boolean isVersion = versionMatches(version); return isFamily && isName && isArch && isVersion; } else { return false; } } /** * Locates an OsFamily by name (case-insensitive). * * @param name The family name to lookup. * @return the OS family, or null if not found. */ public static OsFamily getFamily(final String name) { for (final OsFamily osFamily : ALL_FAMILIES) { if (osFamily.getName().equalsIgnoreCase(name)) { return osFamily; } } return null; } private static boolean versionMatches(final String version) { boolean isVersion = true; if (version != null) { isVersion = version.equalsIgnoreCase(OS_VERSION); } return isVersion; } private static boolean archMatches(final String arch) { boolean isArch = true; if (arch != null) { isArch = arch.equalsIgnoreCase(OS_ARCH); } return isArch; } private static boolean nameMatches(final String name) { boolean isName = true; if (name != null) { isName = name.equalsIgnoreCase(OS_NAME); } return isName; } private static boolean familyMatches(final OsFamily family) { if (family == null) { return false; } for (final OsFamily osFamily : OS_ALL_FAMILIES) { if (family == osFamily) { return true; } } return false; } private static OsFamily[] determineAllFamilies() { // Determine all families the current OS belongs to final Set<OsFamily> allFamilies = new HashSet<OsFamily>(); if (OS_FAMILY != null) { final List<OsFamily> queue = new ArrayList<OsFamily>(); queue.add(OS_FAMILY); while (queue.size() > 0) { final OsFamily family = queue.remove(0); allFamilies.add(family); final OsFamily[] families = family.getFamilies(); for (final OsFamily parent : families) { queue.add(parent); } } } return allFamilies.toArray(new OsFamily[allFamilies.size()]); } private static OsFamily determineOsFamily() { // Determine the most specific OS family if (OS_NAME.indexOf("windows") > -1) { if (OS_NAME.indexOf("xp") > -1 || OS_NAME.indexOf("2000") > -1 || OS_NAME.indexOf("nt") > -1) { return OS_FAMILY_WINNT; } else { return OS_FAMILY_WIN9X; } } else if (OS_NAME.indexOf("os/2") > -1) { return OS_FAMILY_OS2; } else if (OS_NAME.indexOf("netware") > -1) { return OS_FAMILY_NETWARE; } else if (OS_NAME.indexOf("mac") > -1) { if (OS_NAME.endsWith("x")) { return OS_FAMILY_OSX; } else { return OS_FAMILY_MAC; } } else if (PATH_SEP.equals(":")) { return OS_FAMILY_UNIX; } else { return null; } } }