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
26package sun.font;
27
28import java.awt.AWTError;
29import java.awt.Font;
30import java.awt.GraphicsEnvironment;
31import java.awt.Toolkit;
32import java.security.AccessController;
33import java.security.PrivilegedAction;
34
35import 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 */
47public 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                    Class<?> fmClass = Class.forName(fmClassName, true, cl);
83                    instance =
84                       (FontManager) fmClass.getDeclaredConstructor().newInstance();
85                } catch (ReflectiveOperationException ex) {
86                    throw new InternalError(ex);
87
88                }
89                return null;
90            }
91        });
92
93        return instance;
94    }
95}
96