001    package org.apache.archiva.metadata.repository.storage.maven2;
002    /*
003     * Licensed to the Apache Software Foundation (ASF) under one
004     * or more contributor license agreements.  See the NOTICE file
005     * distributed with this work for additional information
006     * regarding copyright ownership.  The ASF licenses this file
007     * to you under the Apache License, Version 2.0 (the
008     * "License"); you may not use this file except in compliance
009     * with the License.  You may obtain a copy of the License at
010     *
011     *   http://www.apache.org/licenses/LICENSE-2.0
012     *
013     * Unless required by applicable law or agreed to in writing,
014     * software distributed under the License is distributed on an
015     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
016     * KIND, either express or implied.  See the License for the
017     * specific language governing permissions and limitations
018     * under the License.
019     */
020    
021    import org.apache.archiva.metadata.model.ArtifactMetadata;
022    import org.apache.maven.artifact.versioning.DefaultArtifactVersion;
023    
024    import java.util.Comparator;
025    
026    /**
027     * @author Olivier Lamy
028     * @since 1.4-M3
029     */
030    public class ArtifactMetadataVersionComparator
031        implements Comparator<ArtifactMetadata>
032    {
033        public static ArtifactMetadataVersionComparator INSTANCE = new ArtifactMetadataVersionComparator();
034    
035        public int compare( ArtifactMetadata o1, ArtifactMetadata o2 )
036        {
037            // sort by version (reverse), then ID
038            int result =
039                new DefaultArtifactVersion( o2.getVersion() ).compareTo( new DefaultArtifactVersion( o1.getVersion() ) );
040            return result != 0 ? result : o1.getId().compareTo( o2.getId() );
041        }
042    }