src/share/classes/java/util/prefs/PreferencesFactory.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * accompanied this code).
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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();
}