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    1   /*
    2    * Copyright (c) 1997, 2006, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   11    * This code is distributed in the hope that it will be useful, but WITHOUT
   12    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   13    * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   14    * version 2 for more details (a copy is included in the LICENSE file that
   15    * accompanied this code).
   16    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   
   26   package sun.awt;
   27   
   28   import java.security.PrivilegedAction;
   29   import java.util.HashMap;
   30   import java.util.Map;
   31   
   32   import static sun.awt.OSInfo.OSType.*;
   33   
   34   /**
   35    * @author Pavel Porvatov
   36    */
   37   public class OSInfo {
   38       public static enum OSType {
   39           WINDOWS,
   40           LINUX,
   41           SOLARIS,
   42           UNKNOWN
   43       }
   44   
   45       /*
   46          The map windowsVersionMap must contain all windows version constants except WINDOWS_UNKNOWN,
   47          and so the method getWindowsVersion() will return the constant for known OS.
   48          It allows compare objects by "==" instead of "equals".
   49        */
   50       public static final WindowsVersion WINDOWS_UNKNOWN = new WindowsVersion(-1, -1);
   51       public static final WindowsVersion WINDOWS_95 = new WindowsVersion(4, 0);
   52       public static final WindowsVersion WINDOWS_98 = new WindowsVersion(4, 10);
   53       public static final WindowsVersion WINDOWS_ME = new WindowsVersion(4, 90);
   54       public static final WindowsVersion WINDOWS_2000 = new WindowsVersion(5, 0);
   55       public static final WindowsVersion WINDOWS_XP = new WindowsVersion(5, 1);
   56       public static final WindowsVersion WINDOWS_2003 = new WindowsVersion(5, 2);
   57       public static final WindowsVersion WINDOWS_VISTA = new WindowsVersion(6, 0);
   58   
   59       private static final String OS_NAME = "os.name";
   60       private static final String OS_VERSION = "os.version";
   61   
   62       private final static Map<String, WindowsVersion> windowsVersionMap = new HashMap<String, OSInfo.WindowsVersion>();
   63   
   64       static {
   65           windowsVersionMap.put(WINDOWS_95.toString(), WINDOWS_95);
   66           windowsVersionMap.put(WINDOWS_98.toString(), WINDOWS_98);
   67           windowsVersionMap.put(WINDOWS_ME.toString(), WINDOWS_ME);
   68           windowsVersionMap.put(WINDOWS_2000.toString(), WINDOWS_2000);
   69           windowsVersionMap.put(WINDOWS_XP.toString(), WINDOWS_XP);
   70           windowsVersionMap.put(WINDOWS_2003.toString(), WINDOWS_2003);
   71           windowsVersionMap.put(WINDOWS_VISTA.toString(), WINDOWS_VISTA);
   72       }
   73   
   74       private static final PrivilegedAction<OSType> osTypeAction = new PrivilegedAction<OSType>() {
   75           public OSType run() {
   76               return getOSType();
   77           }
   78       };
   79   
   80       private OSInfo() {
   81           // Don't allow to create instances
   82       }
   83   
   84       /**
   85        * Returns type of operating system.
   86        */
   87       public static OSType getOSType() throws SecurityException {
   88           String osName = System.getProperty(OS_NAME);
   89   
   90           if (osName != null) {
   91               if (osName.contains("Windows")) {
   92                   return WINDOWS;
   93               }
   94   
   95               if (osName.contains("Linux")) {
   96                   return LINUX;
   97               }
   98   
   99               if (osName.contains("Solaris") || osName.contains("SunOS")) {
  100                   return SOLARIS;
  101               }
  102   
  103               // determine another OS here
  104           }
  105   
  106           return UNKNOWN;
  107       }
  108   
  109       public static PrivilegedAction<OSType> getOSTypeAction() {
  110           return osTypeAction;
  111       }
  112   
  113       public static WindowsVersion getWindowsVersion() throws SecurityException {
  114           String osVersion = System.getProperty(OS_VERSION);
  115   
  116           if (osVersion == null) {
  117               return WINDOWS_UNKNOWN;
  118           }
  119   
  120           synchronized (windowsVersionMap) {
  121               WindowsVersion result = windowsVersionMap.get(osVersion);
  122   
  123               if (result == null) {
  124                   // Try parse version and put object into windowsVersionMap
  125                   String[] arr = osVersion.split("\\.");
  126   
  127                   if (arr.length == 2) {
  128                       try {
  129                           result = new WindowsVersion(Integer.parseInt(arr[0]), Integer.parseInt(arr[1]));
  130                       } catch (NumberFormatException e) {
  131                           return WINDOWS_UNKNOWN;
  132                       }
  133                   } else {
  134                       return WINDOWS_UNKNOWN;
  135                   }
  136   
  137                   windowsVersionMap.put(osVersion, result);
  138               }
  139   
  140               return result;
  141           }
  142       }
  143   
  144       public static class WindowsVersion implements Comparable<WindowsVersion> {
  145           private final int major;
  146   
  147           private final int minor;
  148   
  149           private WindowsVersion(int major, int minor) {
  150               this.major = major;
  151               this.minor = minor;
  152           }
  153   
  154           public int getMajor() {
  155               return major;
  156           }
  157   
  158           public int getMinor() {
  159               return minor;
  160           }
  161   
  162           public int compareTo(WindowsVersion o) {
  163               int result = major - o.getMajor();
  164   
  165               if (result == 0) {
  166                   result = minor - o.getMinor();
  167               }
  168   
  169               return result;
  170           }
  171   
  172           public boolean equals(Object obj) {
  173               return obj instanceof WindowsVersion && compareTo((WindowsVersion) obj) == 0;
  174           }
  175   
  176           public int hashCode() {
  177               return 31 * major + minor;
  178           }
  179   
  180           public String toString() {
  181               return major + "." + minor;
  182           }
  183       }
  184   }

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