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package org.apache.maven.graph;
/*
* 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 java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.maven.execution.ProjectDependencyGraph;
import org.apache.maven.project.DuplicateProjectException;
import org.apache.maven.project.MavenProject;
import org.apache.maven.project.ProjectSorter;
import org.codehaus.plexus.util.dag.CycleDetectedException;
/**
* Describes the inter-dependencies between projects in the reactor.
*
* @author Benjamin Bentmann
*/
public class DefaultProjectDependencyGraph
implements ProjectDependencyGraph
{
private ProjectSorter sorter;
/**
* Creates a new project dependency graph based on the specified projects.
*
* @param projects The projects to create the dependency graph with
* @throws DuplicateProjectException
* @throws CycleDetectedException
*/
public DefaultProjectDependencyGraph( Collection<MavenProject> projects )
throws CycleDetectedException, DuplicateProjectException
{
this.sorter = new ProjectSorter( projects );
}
public List<MavenProject> getSortedProjects()
{
return new ArrayList<MavenProject>( sorter.getSortedProjects() );
}
public List<MavenProject> getDownstreamProjects( MavenProject project, boolean transitive )
{
if ( project == null )
{
throw new IllegalArgumentException( "project missing" );
}
Set<String> projectIds = new HashSet<String>();
getDownstreamProjects( ProjectSorter.getId( project ), projectIds, transitive );
return getSortedProjects( projectIds );
}
private void getDownstreamProjects( String projectId, Set<String> projectIds, boolean transitive )
{
for ( String id : sorter.getDependents( projectId ) )
{
if ( projectIds.add( id ) && transitive )
{
getDownstreamProjects( id, projectIds, transitive );
}
}
}
public List<MavenProject> getUpstreamProjects( MavenProject project, boolean transitive )
{
if ( project == null )
{
throw new IllegalArgumentException( "project missing" );
}
Set<String> projectIds = new HashSet<String>();
getUpstreamProjects( ProjectSorter.getId( project ), projectIds, transitive );
return getSortedProjects( projectIds );
}
private void getUpstreamProjects( String projectId, Collection<String> projectIds, boolean transitive )
{
for ( String id : sorter.getDependencies( projectId ) )
{
if ( projectIds.add( id ) && transitive )
{
getUpstreamProjects( id, projectIds, transitive );
}
}
}
private List<MavenProject> getSortedProjects( Set<String> projectIds )
{
List<MavenProject> result = new ArrayList<MavenProject>( projectIds.size() );
for ( MavenProject mavenProject : sorter.getSortedProjects() )
{
if ( projectIds.contains( ProjectSorter.getId( mavenProject ) ) )
{
result.add( mavenProject );
}
}
return result;
}
@Override
public String toString()
{
return sorter.getSortedProjects().toString();
}
}
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