001package org.apache.maven.repository.legacy.resolver.conflict;
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.maven.artifact.resolver.ResolutionNode;
023import org.codehaus.plexus.component.annotations.Component;
024
025/**
026 * Resolves conflicting artifacts by always selecting the <em>nearest</em> declaration. Nearest is defined as the
027 * declaration that has the least transitive steps away from the project being built.
028 *
029 * @author <a href="mailto:jason@maven.org">Jason van Zyl</a>
030 * @author <a href="mailto:markhobson@gmail.com">Mark Hobson</a>
031 * @since 3.0
032 */
033@Component( role = ConflictResolver.class, hint = "nearest" )
034public class NearestConflictResolver
035    implements ConflictResolver
036{
037    // ConflictResolver methods -----------------------------------------------
038
039    /*
040    * @see org.apache.maven.artifact.resolver.conflict.ConflictResolver#resolveConflict(org.apache.maven.artifact.resolver.ResolutionNode,
041    *      org.apache.maven.artifact.resolver.ResolutionNode)
042    */
043
044    public ResolutionNode resolveConflict( ResolutionNode node1, ResolutionNode node2 )
045    {
046        return node1.getDepth() <= node2.getDepth() ? node1 : node2;
047    }
048}