Source code

001package org.apache.archiva.configuration.functors;
002
003/*
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements.  See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership.  The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License.  You may obtain a copy of the License at
011 *
012 *  http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing,
015 * software distributed under the License is distributed on an
016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017 * KIND, either express or implied.  See the License for the
018 * specific language governing permissions and limitations
019 * under the License.
020 */
021
022import org.apache.archiva.configuration.ProxyConnectorConfiguration;
023
024import java.util.Comparator;
025
026/**
027 *
028 * Was marked as deprecated before, but is still used.
029 *
030 */
031public class ProxyConnectorConfigurationOrderComparator
032    implements Comparator<ProxyConnectorConfiguration>
033{
034    private static ProxyConnectorConfigurationOrderComparator INSTANCE =
035        new ProxyConnectorConfigurationOrderComparator();
036
037    @Override
038    public int compare( ProxyConnectorConfiguration o1, ProxyConnectorConfiguration o2 )
039    {
040        if ( o1 == null && o2 == null )
041        {
042            return 0;
043        }
044
045        // Ensure null goes to end of list.
046        if ( o1 == null && o2 != null )
047        {
048            return 1;
049        }
050
051        if ( o1 != null && o2 == null )
052        {
053            return -1;
054        }
055
056        // Ensure 0 (unordered) goes to end of list.
057        if ( o1.getOrder() == 0 && o2.getOrder() != 0 )
058        {
059            return 1;
060        }
061
062        if ( o1.getOrder() != 0 && o2.getOrder() == 0 )
063        {
064            return -1;
065        }
066
067        return o1.getOrder() - o2.getOrder();
068    }
069
070    public static ProxyConnectorConfigurationOrderComparator getInstance()
071    {
072        return INSTANCE;
073    }
074}