001    package 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    
022    import 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     */
030    public 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    }