1 /*
   2  * Copyright 2008 Sun Microsystems, Inc.  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.  Sun designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  22  * CA 95054 USA or visit www.sun.com if you need additional information or
  23  * have any 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         String fmClassName = AccessController.doPrivileged(
  72                 new GetPropertyAction("sun.font.fontmanager",
  73                                       DEFAULT_CLASS));
  74         
  75         try {
  76             @SuppressWarnings("unchecked")
  77             ClassLoader cl = (ClassLoader)
  78                 AccessController.doPrivileged(new PrivilegedAction() {
  79                     public Object run() {
  80                         return ClassLoader.getSystemClassLoader();
  81                     }
  82                 });
  83             
  84             @SuppressWarnings("unchecked")
  85             Class fmClass = Class.forName(fmClassName, true, cl);
  86             instance = (FontManager) fmClass.newInstance();
  87               
  88         } catch (ClassNotFoundException ex) {
  89             InternalError err = new InternalError();
  90             err.initCause(ex);
  91             throw err;
  92               
  93         } catch (InstantiationException ex) {
  94             InternalError err = new InternalError();
  95             err.initCause(ex);
  96             throw err;
  97               
  98         } catch (IllegalAccessException ex) {
  99             InternalError err = new InternalError();
 100             err.initCause(ex);
 101             throw err;
 102         }
 103           
 104         return instance;
 105     }
 106 }