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 java.io.IOException;
  import java.util.LinkedHashSet;
  import java.util.Objects;
  import java.util.Set;
  
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugins.annotations.LifecyclePhase;
  import org.apache.maven.plugins.annotations.Mojo;
  import org.apache.maven.plugins.annotations.Parameter;
  import org.apache.maven.plugins.dependency.utils.DependencyUtil;
  import org.apache.maven.project.ProjectBuildingRequest;
  import org.apache.maven.shared.artifact.filter.collection.ArtifactFilterException;
  import org.apache.maven.shared.artifact.filter.collection.ArtifactsFilter;
  import org.apache.maven.shared.artifact.filter.collection.FilterArtifacts;
  import org.apache.maven.shared.transfer.artifact.resolve.ArtifactResolverException;
  import org.apache.maven.shared.transfer.dependencies.DefaultDependableCoordinate;
  import org.apache.maven.shared.transfer.dependencies.resolve.DependencyResolverException;
  
  /**
   * Goal that resolves all project plugins and reports and their dependencies.
   *
   * @author <a href="mailto:brianf@apache.org">Brian Fox</a>
   * @since 2.0
   */
  @Mojo( name = "resolve-plugins", defaultPhase = LifecyclePhase.GENERATE_SOURCES, threadSafe = true )
  public class ResolvePluginsMojo
      extends AbstractResolveMojo
  {
  
      @Parameter( property = "outputEncoding", defaultValue = "${project.reporting.outputEncoding}" )
      private String outputEncoding;
  
      /**
       * Main entry into mojo. Gets the list of dependencies and iterates through displaying the resolved version.
       *
       * @throws MojoExecutionException with a message if an error occurs.
       */
      @Override
      protected void doExecute()
          throws MojoExecutionException
      {
          try
          {
              // ideally this should either be DependencyCoordinates or DependencyNode
              final Set<Artifact> plugins = resolvePluginArtifacts();
  
              StringBuilder sb = new StringBuilder();
              sb.append( System.lineSeparator() );
              sb.append( "The following plugins have been resolved:" );
              sb.append( System.lineSeparator() );
              if ( plugins == null || plugins.isEmpty() )
              {
                  sb.append( "   none" );
                  sb.append( System.lineSeparator() );
              }
              else
              {
                  for ( Artifact plugin : plugins )
                  {
                      String artifactFilename = null;
                      if ( outputAbsoluteArtifactFilename )
                      {
                          try
                          {
                              // we want to print the absolute file name here
                              artifactFilename = plugin.getFile().getAbsoluteFile().getPath();
                          }
                          catch ( NullPointerException e )
                          {
                              // ignore the null pointer, we'll output a null string
                              artifactFilename = null;
                          }
                      }
  
                      String id = plugin.toString();
                      sb.append( "   " )
                              .append( id )
                             .append( outputAbsoluteArtifactFilename ? ":" + artifactFilename : "" )
                             .append( System.lineSeparator() );
 
                     if ( !excludeTransitive )
                     {
                         DefaultDependableCoordinate pluginCoordinate = new DefaultDependableCoordinate();
                         pluginCoordinate.setGroupId( plugin.getGroupId() );
                         pluginCoordinate.setArtifactId( plugin.getArtifactId() );
                         pluginCoordinate.setVersion( plugin.getVersion() );
 
                         for ( final Artifact artifact : resolveArtifactDependencies( pluginCoordinate ) )
                         {
                             artifactFilename = null;
                             if ( outputAbsoluteArtifactFilename )
                             {
                                 try
                                 {
                                     // we want to print the absolute file name here
                                     artifactFilename = artifact.getFile().getAbsoluteFile().getPath();
                                 }
                                 catch ( NullPointerException e )
                                 {
                                     // ignore the null pointer, we'll output a null string
                                     artifactFilename = null;
                                 }
                             }
 
                             id = artifact.toString();
                             sb.append( "      " )
                                     .append( id )
                                     .append( outputAbsoluteArtifactFilename ? ":" + artifactFilename : "" )
                                     .append( System.lineSeparator() );
                         }
                     }
                 }
                 sb.append( System.lineSeparator() );
 
                 String output = sb.toString();
                 if ( outputFile == null )
                 {
                     DependencyUtil.log( output, getLog() );
                 }
                 else
                 {
                     String encoding = Objects.toString( outputEncoding, "UTF-8" );
                     DependencyUtil.write( output, outputFile, appendOutput, encoding );
                 }
             }
         }
         catch ( IOException | ArtifactFilterException | ArtifactResolverException | DependencyResolverException e )
         {
             throw new MojoExecutionException( e.getMessage(), e );
         }
     }
 
     /**
      * This method resolves the plugin artifacts from the project.
      *
      * @return set of resolved plugin artifacts
      * @throws ArtifactFilterException in case of an error
      * @throws ArtifactResolverException in case of an error
      */
     protected Set<Artifact> resolvePluginArtifacts()
         throws ArtifactFilterException, ArtifactResolverException
     {
         final Set<Artifact> plugins = getProject().getPluginArtifacts();
         final Set<Artifact> reports = getProject().getReportArtifacts();
 
         Set<Artifact> artifacts = new LinkedHashSet<>();
         artifacts.addAll( reports );
         artifacts.addAll( plugins );
 
         final FilterArtifacts filter = getArtifactsFilter();
         artifacts = filter.filter( artifacts );
 
         Set<Artifact> resolvedArtifacts = new LinkedHashSet<>( artifacts.size() );
         // final ArtifactFilter filter = getPluginFilter();
         for ( final Artifact artifact : new LinkedHashSet<>( artifacts ) )
         {
             // if ( !filter.include( artifact ) )
             // {
             // final String logStr =
             // String.format( " Plugin SKIPPED: %s", DependencyUtil.getFormattedFileName( artifact, false ) );
             //
             // if ( !silent )
             // {
             // this.getLog().info( logStr );
             // }
             //
             // artifacts.remove( artifact );
             // continue;
             // }
 
             ProjectBuildingRequest buildingRequest = newResolvePluginProjectBuildingRequest();
 
             // resolve the new artifact
             resolvedArtifacts.add( getArtifactResolver().resolveArtifact( buildingRequest, artifact ).getArtifact() );
         }
         return artifacts;
     }
 
     @Override
     protected ArtifactsFilter getMarkedArtifactFilter()
     {
         return null;
     }
 }