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    1   /*
    2    * Copyright (c) 2008, 2010, 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.font;
   27   
   28   import java.awt.AWTError;
   29   import java.awt.Font;
   30   import java.awt.GraphicsEnvironment;
   31   import java.awt.Toolkit;
   32   import java.security.AccessController;
   33   import java.security.PrivilegedAction;
   34   
   35   import sun.security.action.GetPropertyAction;
   36   
   37   
   38   /**
   39    * Factory class used to retrieve a valid FontManager instance for the current
   40    * platform.
   41    *
   42    * A default implementation is given for Linux, Solaris and Windows.
   43    * You can alter the behaviour of the {@link #getInstance()} method by setting
   44    * the {@code sun.font.fontmanager} property. For example:
   45    * {@code sun.font.fontmanager=sun.awt.X11FontManager}
   46    */
   47   public final class FontManagerFactory {
   48   
   49       /** Our singleton instance. */
   50       private static FontManager instance = null;
   51   
   52       private static final String DEFAULT_CLASS;
   53       static {
   54           if (FontUtilities.isWindows)
   55               DEFAULT_CLASS = "sun.awt.Win32FontManager";
   56           else
   57               DEFAULT_CLASS = "sun.awt.X11FontManager";
   58       }
   59   
   60       /**
   61        * Get a valid FontManager implementation for the current platform.
   62        *
   63        * @return a valid FontManager instance for the current platform
   64        */
   65       public static synchronized FontManager getInstance() {
   66   
   67           if (instance != null) {
   68               return instance;
   69           }
   70   
   71           AccessController.doPrivileged(new PrivilegedAction() {
   72   
   73               public Object run() {
   74                   try {
   75                       String fmClassName =
   76                               System.getProperty("sun.font.fontmanager",
   77                                                  DEFAULT_CLASS);
   78                       ClassLoader cl = ClassLoader.getSystemClassLoader();
   79                       Class fmClass = Class.forName(fmClassName, true, cl);
   80                       instance = (FontManager) fmClass.newInstance();
   81                   } catch (ClassNotFoundException ex) {
   82                       InternalError err = new InternalError();
   83                       err.initCause(ex);
   84                       throw err;
   85   
   86                   } catch (InstantiationException ex) {
   87                       InternalError err = new InternalError();
   88                       err.initCause(ex);
   89                       throw err;
   90   
   91                   } catch (IllegalAccessException ex) {
   92                       InternalError err = new InternalError();
   93                       err.initCause(ex);
   94                       throw err;
   95                   }
   96                   return null;
   97               }
   98           });
   99   
  100           return instance;
  101       }
  102   }

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