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package org.apache.maven.repository.legacy.resolver.conflict;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import org.apache.maven.artifact.resolver.ResolutionNode;
import org.apache.maven.artifact.versioning.ArtifactVersion;
import org.apache.maven.artifact.versioning.OverConstrainedVersionException;
import org.codehaus.plexus.component.annotations.Component;
/**
* Resolves conflicting artifacts by always selecting the <em>oldest</em> declaration. Oldest is defined as the
* declaration whose version is less according to <code>ArtifactVersion.compareTo</code>.
*
* @author <a href="mailto:markhobson@gmail.com">Mark Hobson</a>
* @see ArtifactVersion#compareTo
* @since 3.0
*/
@Component( role = ConflictResolver.class, hint = "oldest" )
public class OldestConflictResolver
implements ConflictResolver
{
// ConflictResolver methods -----------------------------------------------
/*
* @see org.apache.maven.artifact.resolver.conflict.ConflictResolver#resolveConflict(org.apache.maven.artifact.resolver.ResolutionNode,
* org.apache.maven.artifact.resolver.ResolutionNode)
*/
public ResolutionNode resolveConflict( ResolutionNode node1, ResolutionNode node2 )
{
try
{
ArtifactVersion version1 = node1.getArtifact().getSelectedVersion();
ArtifactVersion version2 = node2.getArtifact().getSelectedVersion();
return version1.compareTo( version2 ) <= 0 ? node1 : node2;
}
catch ( OverConstrainedVersionException exception )
{
// TODO: log message or throw exception?
return null;
}
}
}
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