001/*
002 * (C) Copyright 2006-2007 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Nuxeo - initial API and implementation
018 *
019 * $Id$
020 */
021
022package org.nuxeo.theme.properties;
023
024import java.util.ArrayList;
025import java.util.Collections;
026import java.util.Enumeration;
027import java.util.List;
028import java.util.Properties;
029
030public class OrderedProperties extends Properties {
031
032    private static final long serialVersionUID = 1L;
033
034    private final List<Object> order;
035
036    public OrderedProperties() {
037        order = new ArrayList<Object>();
038    }
039
040    @Override
041    public Enumeration<Object> propertyNames() {
042        return Collections.enumeration(order);
043    }
044
045    @Override
046    public Object put(Object key, Object value) {
047        if (order.contains(key)) {
048            order.remove(key);
049        }
050        order.add(key);
051        return super.put(key, value);
052    }
053
054    @Override
055    public Object remove(Object key) {
056        order.remove(key);
057        return super.remove(key);
058    }
059
060}