1 /*
   2  * Copyright (c) 2008, 2014, 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 if (FontUtilities.isMacOSX) {
  57             DEFAULT_CLASS = "sun.font.CFontManager";
  58             } else {
  59             DEFAULT_CLASS = "sun.awt.X11FontManager";
  60             }
  61     }
  62 
  63     /**
  64      * Get a valid FontManager implementation for the current platform.
  65      *
  66      * @return a valid FontManager instance for the current platform
  67      */
  68     public static synchronized FontManager getInstance() {
  69 
  70         if (instance != null) {
  71             return instance;
  72         }
  73 
  74         AccessController.doPrivileged(new PrivilegedAction<Object>() {
  75 
  76             public Object run() {
  77                 try {
  78                     String fmClassName =
  79                             System.getProperty("sun.font.fontmanager",
  80                                                DEFAULT_CLASS);
  81                     ClassLoader cl = ClassLoader.getSystemClassLoader();
  82                     @SuppressWarnings("deprecation")
  83                     Object fmObject = Class.forName(fmClassName, true, cl).newInstance();
  84                     instance = (FontManager) fmObject;
  85                 } catch (ClassNotFoundException |
  86                          InstantiationException |
  87                          IllegalAccessException ex) {
  88                     throw new InternalError(ex);
  89 
  90                 }
  91                 return null;
  92             }
  93         });
  94 
  95         return instance;
  96     }
  97 }
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