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;
023
024/**
025 * Determines which version of an artifact to use when there are conflicting declarations.
026 *
027 * @author <a href="mailto:jason@maven.org">Jason van Zyl</a>
028 * @author <a href="mailto:markhobson@gmail.com">Mark Hobson</a>
029 */
030public interface ConflictResolver
031{
032    String ROLE = ConflictResolver.class.getName();
033
034    /**
035     * Determines which of the specified versions of an artifact to use when there are conflicting declarations.
036     *
037     * @param node1 the first artifact declaration
038     * @param node2 the second artifact declaration
039     * @return the artifact declaration to use: <code>node1</code>; <code>node2</code>; or <code>null</code>if
040     *         this conflict cannot be resolved
041     * @since 3.0
042     */
043    ResolutionNode resolveConflict( ResolutionNode node1, ResolutionNode node2 );
044}