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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.IdentityHashMap;
import java.util.List;
import java.util.Map;
import org.apache.maven.execution.ProjectDependencyGraph;
import org.apache.maven.project.MavenProject;
/**
* Provides a sub view of another dependency graph.
*
* @author Benjamin Bentmann
*/
class FilteredProjectDependencyGraph
implements ProjectDependencyGraph
{
private ProjectDependencyGraph projectDependencyGraph;
private Map<MavenProject, ?> whiteList;
private List<MavenProject> sortedProjects;
/**
* Creates a new project dependency graph from the specified graph.
*
* @param projectDependencyGraph The project dependency graph to create a sub view from, must not be {@code null}.
* @param whiteList The projects on which the dependency view should focus, must not be {@code null}.
*/
public FilteredProjectDependencyGraph( ProjectDependencyGraph projectDependencyGraph,
Collection<? extends MavenProject> whiteList )
{
if ( projectDependencyGraph == null )
{
throw new IllegalArgumentException( "project dependency graph missing" );
}
this.projectDependencyGraph = projectDependencyGraph;
this.whiteList = new IdentityHashMap<MavenProject, Object>();
for ( MavenProject project : whiteList )
{
this.whiteList.put( project, null );
}
}
public List<MavenProject> getSortedProjects()
{
if ( sortedProjects == null )
{
sortedProjects = applyFilter( projectDependencyGraph.getSortedProjects() );
}
return new ArrayList<MavenProject>( sortedProjects );
}
public List<MavenProject> getDownstreamProjects( MavenProject project, boolean transitive )
{
return applyFilter( projectDependencyGraph.getDownstreamProjects( project, transitive ) );
}
public List<MavenProject> getUpstreamProjects( MavenProject project, boolean transitive )
{
return applyFilter( projectDependencyGraph.getUpstreamProjects( project, transitive ) );
}
private List<MavenProject> applyFilter( Collection<? extends MavenProject> projects )
{
List<MavenProject> filtered = new ArrayList<MavenProject>( projects.size() );
for ( MavenProject project : projects )
{
if ( whiteList.containsKey( project ) )
{
filtered.add( project );
}
}
return filtered;
}
@Override
public String toString()
{
return getSortedProjects().toString();
}
}
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