package org.apache.maven.plugins.dependency.resolvers;
   
   /* 
    * 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.Artifact;
  import org.apache.maven.artifact.repository.ArtifactRepository;
  import org.apache.maven.model.Dependency;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugins.dependency.utils.DependencyUtil;
  import org.apache.maven.plugins.annotations.Mojo;
  import org.apache.maven.project.ProjectBuildingRequest;
  import org.apache.maven.shared.artifact.filter.collection.ArtifactsFilter;
  import org.apache.maven.shared.artifact.filter.resolve.TransformableFilter;
  import org.apache.maven.shared.transfer.artifact.resolve.ArtifactResult;
  import org.apache.maven.shared.transfer.dependencies.DefaultDependableCoordinate;
  import org.apache.maven.shared.transfer.dependencies.DependableCoordinate;
  import org.apache.maven.shared.transfer.dependencies.resolve.DependencyResolverException;
  
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.LinkedHashSet;
  import java.util.Set;
  import java.util.stream.Collectors;
  
  /**
   * Goal that resolves all project dependencies, including plugins and reports and their dependencies.
   *
   * <a href="mailto:brianf@apache.org">Brian Fox</a>
   * @author Maarten Mulders
   * @since 2.0
   */
  @Mojo( name = "go-offline", threadSafe = true )
  public class GoOfflineMojo
      extends AbstractResolveMojo
  {
      /**
       * Main entry into mojo. Gets the list of dependencies, resolves all that are not in the Reactor, and iterates
       * through displaying the resolved versions.
       *
       * @throws MojoExecutionException with a message if an error occurs.
       */
      @Override
      protected void doExecute()
          throws MojoExecutionException
      {
  
          try
          {
              final Set<Artifact> plugins = resolvePluginArtifacts();
  
              final Set<Artifact> dependencies = resolveDependencyArtifacts();
  
              if ( !isSilent() )
              {
                  for ( Artifact artifact : plugins )
                  {
                      this.getLog().info( "Resolved plugin: "
                              + DependencyUtil.getFormattedFileName( artifact, false ) );
                  }
  
                  for ( Artifact artifact : dependencies )
                  {
                      this.getLog().info( "Resolved dependency: "
                              + DependencyUtil.getFormattedFileName( artifact, false ) );
                  }
              }
  
          }
          catch ( DependencyResolverException e )
          {
              throw new MojoExecutionException( e.getMessage(), e );
          }
  
      }
  
      /**
       * This method resolves the dependency artifacts from the project.
       *
       * @return set of resolved dependency artifacts.
       * @throws DependencyResolverException in case of an error while resolving the artifacts.
       */
      protected Set<Artifact> resolveDependencyArtifacts()
             throws DependencyResolverException
     {
         Collection<Dependency> dependencies = getProject().getDependencies();
 
         Set<DependableCoordinate> dependableCoordinates = dependencies.stream()
                 .map( this::createDependendableCoordinateFromDependency )
                 .collect( Collectors.toSet() );
 
         ProjectBuildingRequest buildingRequest = newResolveArtifactProjectBuildingRequest();
 
         return resolveDependableCoordinate( buildingRequest, dependableCoordinates, "dependencies" );
     }
 
     private Set<Artifact> resolveDependableCoordinate( final ProjectBuildingRequest buildingRequest,
                                                         final Collection<DependableCoordinate> dependableCoordinates,
                                                        final String type )
             throws DependencyResolverException
     {
         final TransformableFilter filter = getTransformableFilter();
 
         this.getLog().debug( "Resolving '" + type + "' with following repositories:" );
         for ( ArtifactRepository repo : buildingRequest.getRemoteRepositories() )
         {
             getLog().debug( repo.getId() + " (" + repo.getUrl() + ")" );
         }
 
         final Set<Artifact> results = new HashSet<>();
 
         for ( DependableCoordinate dependableCoordinate : dependableCoordinates )
         {
             final Iterable<ArtifactResult> artifactResults = getDependencyResolver().resolveDependencies(
                     buildingRequest, dependableCoordinate, filter );
 
             for ( final ArtifactResult artifactResult : artifactResults )
             {
                 results.add( artifactResult.getArtifact() );
             }
         }
 
         return results;
     }
 
     private TransformableFilter getTransformableFilter()
     {
         if ( this.excludeReactor )
         {
             return new ExcludeReactorProjectsDependencyFilter( this.reactorProjects, getLog() );
         }
         else
         {
             return null;
         }
     }
 
     /**
      * This method resolves the plugin artifacts from the project.
      *
      * @return set of resolved plugin artifacts.
      * @throws DependencyResolverException in case of an error while resolving the artifacts.
      */
     protected Set<Artifact> resolvePluginArtifacts()
             throws DependencyResolverException
     {
 
         Set<Artifact> plugins = getProject().getPluginArtifacts();
         Set<Artifact> reports = getProject().getReportArtifacts();
 
         Set<Artifact> artifacts = new LinkedHashSet<>();
         artifacts.addAll( reports );
         artifacts.addAll( plugins );
 
         Set<DependableCoordinate> dependableCoordinates = artifacts.stream()
                 .map( this::createDependendableCoordinateFromArtifact )
                 .collect( Collectors.toSet() );
 
 
         ProjectBuildingRequest buildingRequest = newResolvePluginProjectBuildingRequest();
 
         return resolveDependableCoordinate( buildingRequest, dependableCoordinates, "plugins" );
     }
 
     private DependableCoordinate createDependendableCoordinateFromArtifact( final Artifact artifact )
     {
         final DefaultDependableCoordinate result = new DefaultDependableCoordinate();
         result.setGroupId( artifact.getGroupId() );
         result.setArtifactId( artifact.getArtifactId() );
         result.setVersion( artifact.getVersion() );
         result.setType( artifact.getType() );
         result.setClassifier( artifact.getClassifier() );
 
         return result;
     }
 
     private DependableCoordinate createDependendableCoordinateFromDependency( final Dependency dependency )
     {
         final DefaultDependableCoordinate result = new DefaultDependableCoordinate();
         result.setGroupId( dependency.getGroupId() );
         result.setArtifactId( dependency.getArtifactId() );
         result.setVersion( dependency.getVersion() );
         result.setType( dependency.getType() );
         result.setClassifier( dependency.getClassifier() );
 
         return result;
     }
 
     @Override
     protected ArtifactsFilter getMarkedArtifactFilter()
     {
         return null;
     }
 }