001    package org.apache.archiva.rest.services.utils;
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    
022    import org.apache.archiva.rest.api.model.AdminRepositoryConsumer;
023    
024    import java.util.Comparator;
025    
026    /**
027     * AdminRepositoryConsumerComparator 
028     *
029     *
030     */
031    public class AdminRepositoryConsumerComparator
032        implements Comparator<AdminRepositoryConsumer>
033    {
034        private static AdminRepositoryConsumerComparator INSTANCE = new AdminRepositoryConsumerComparator();
035    
036        public static AdminRepositoryConsumerComparator getInstance()
037        {
038            return INSTANCE;
039        }
040    
041        public int compare( AdminRepositoryConsumer o1, AdminRepositoryConsumer o2 )
042        {
043            if ( o1 == null && o2 == null )
044            {
045                return 0;
046            }
047    
048            if ( o1 == null && o2 != null )
049            {
050                return 1;
051            }
052    
053            if ( o1 != null && o2 == null )
054            {
055                return -1;
056            }
057    
058            String id1 = o1.getId();
059            String id2 = o2.getId();
060            return id1.compareToIgnoreCase( id2 );
061        }
062    }