001/*
002 * (C) Copyright 2006-2007 Nuxeo SAS (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     Nuxeo - initial API and implementation
016 *
017 * $Id$
018 */
019
020package org.nuxeo.theme.properties;
021
022import java.util.ArrayList;
023import java.util.Collections;
024import java.util.Enumeration;
025import java.util.List;
026import java.util.Properties;
027
028public class OrderedProperties extends Properties {
029
030    private static final long serialVersionUID = 1L;
031
032    private final List<Object> order;
033
034    public OrderedProperties() {
035        order = new ArrayList<Object>();
036    }
037
038    @Override
039    public Enumeration<Object> propertyNames() {
040        return Collections.enumeration(order);
041    }
042
043    @Override
044    public Object put(Object key, Object value) {
045        if (order.contains(key)) {
046            order.remove(key);
047        }
048        order.add(key);
049        return super.put(key, value);
050    }
051
052    @Override
053    public Object remove(Object key) {
054        order.remove(key);
055        return super.remove(key);
056    }
057
058}