PreferencesFactory.java revision 49965c1dc9da104344f4893a05e45795a5740d20 
1/*
2 * Copyright (c) 2000, 2005, 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
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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 *
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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.
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24 */
25
26package java.util.prefs;
27import java.util.*;
28
29/**
30 * A factory object that generates Preferences objects.  Providers of
31 * new {@link Preferences} implementations should provide corresponding
32 * <tt>PreferencesFactory</tt> implementations so that the new
33 * <tt>Preferences</tt> implementation can be installed in place of the
34 * platform-specific default implementation.
35 *
36 * <p><strong>This class is for <tt>Preferences</tt> implementers only.
37 * Normal users of the <tt>Preferences</tt> facility should have no need to
38 * consult this documentation.</strong>
39 *
40 * @author  Josh Bloch
41 * @see     Preferences
42 * @since   1.4
43 */
44public interface PreferencesFactory {
45    /**
46     * Returns the system root preference node.  (Multiple calls on this
47     * method will return the same object reference.)
48     */
49    Preferences systemRoot();
50
51    /**
52     * Returns the user root preference node corresponding to the calling
53     * user.  In a server, the returned value will typically depend on
54     * some implicit client-context.
55     */
56    Preferences userRoot();
57}
58