001package 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
022import 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 */
030public 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}