/* * Copyright (c) 2000, 2005, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package java.util.prefs;import java.util.*; /** * A factory object that generates Preferences objects.  Providers of * new {@link Preferences} implementations should provide corresponding * <tt>PreferencesFactory</tt> implementations so that the new * <tt>Preferences</tt> implementation can be installed in place of the * platform-specific default implementation. * * <p><strong>This class is for <tt>Preferences</tt> implementers only. * Normal users of the <tt>Preferences</tt> facility should have no need to * consult this documentation.</strong> * * @author  Josh Bloch * @see     Preferences * @since   1.4 */public interface PreferencesFactory {    /**     * Returns the system root preference node.  (Multiple calls on this     * method will return the same object reference.)     */    Preferences systemRoot();     /**     * Returns the user root preference node corresponding to the calling     * user.  In a server, the returned value will typically depend on     * some implicit client-context.     */    Preferences userRoot();}