001    package org.apache.maven.repository.metadata;
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.ArtifactScopeEnum;
023    
024    /**
025     * Resolves conflicts in the supplied dependency graph.
026     * Different implementations will implement different conflict resolution policies.
027     *
028     * @author <a href="mailto:oleg@codehaus.org">Oleg Gusakov</a>
029     */
030    public interface GraphConflictResolver
031    {
032        String ROLE = GraphConflictResolver.class.getName();
033    
034        /**
035         * Cleanses the supplied graph by leaving only one directed versioned edge\
036         * between any two nodes, if multiple exists. Uses scope relationships, defined
037         * in <code>ArtifactScopeEnum</code>
038         *
039         * @param graph the "dirty" graph to be simplified via conflict resolution
040         * @param scope scope for which the graph should be resolved
041         *
042         * @return resulting "clean" graph for the specified scope
043         *
044         * @since 3.0
045         */
046        MetadataGraph resolveConflicts( MetadataGraph graph, ArtifactScopeEnum scope )
047            throws GraphConflictResolutionException;
048    }