/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: Pref.java
*
* Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
*
* Electric(tm) is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Electric(tm) 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with Electric(tm); see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, Mass 02111-1307, USA.
*/
package com.sun.electric.database.text;
import java.util.prefs.AbstractPreferences;
import java.util.prefs.BackingStoreException;
import java.util.prefs.Preferences;
import java.util.prefs.PreferencesFactory;
/**
* Empty Preferences to ensure that Electric server doesn't touch real Preferences.
*/
public class EmptyPreferencesFactory implements PreferencesFactory {
/**
* Returns the system root preference node. (Multiple calls on this
* method will return the same object reference.)
*/
public Preferences systemRoot() {
throw new UnsupportedOperationException();
}
/**
* 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.
*/
public Preferences userRoot() {
return factoryPrefRoot;
}
static final Preferences factoryPrefRoot = new AbstractPreferences(null, "") {
@Override
protected String getSpi(String key) {
return null;
}
@Override
protected AbstractPreferences childSpi(String name) {
return this;
}
@Override
protected void putSpi(String key, String value) {
throw new UnsupportedOperationException();
}
@Override
protected void removeSpi(String key) {
throw new UnsupportedOperationException();
}
@Override
protected void removeNodeSpi() {
throw new UnsupportedOperationException();
}
@Override
protected String[] keysSpi() {
throw new UnsupportedOperationException();
}
@Override
protected String[] childrenNamesSpi() throws BackingStoreException {
return new String[0];
}
@Override
protected void syncSpi() throws BackingStoreException {
throw new UnsupportedOperationException();
}
@Override
protected void flushSpi() throws BackingStoreException {
// throw new UnsupportedOperationException();
}
};
}