package org.apache.maven.plugin.coreit;
   
   /*
    * 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.factory.ArtifactFactory;
  import org.apache.maven.artifact.metadata.ArtifactMetadataSource;
  import org.apache.maven.artifact.repository.ArtifactRepository;
  import org.apache.maven.artifact.resolver.ArtifactResolver;
  import org.apache.maven.model.Dependency;
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Properties;
  import java.util.Set;
  
  /**
   * Resolves user-specified artifacts transitively. As an additional exercise, the resolution happens in a forked thread
   * to test access to any shared session state.
   *
   * @author Benjamin Bentmann
   * @goal resolve-transitive
   */
  public class ResolveTransitiveMojo
      extends AbstractMojo
  {
  
      /**
       * The local repository.
       *
       * @parameter default-value="${localRepository}"
       * @readonly
       * @required
       */
      private ArtifactRepository localRepository;
  
      /**
       * The remote repositories of the current Maven project.
       *
       * @parameter default-value="${project.remoteArtifactRepositories}"
       * @readonly
       * @required
       */
      private List remoteRepositories;
  
      /**
       * The artifact resolver.
       *
       * @component
       */
      private ArtifactResolver resolver;
  
      /**
       * The artifact factory.
       *
       * @component
       */
      private ArtifactFactory factory;
  
      /**
       * The metadata source.
       *
       * @component
       */
      private ArtifactMetadataSource metadataSource;
  
      /**
       * The dependencies to resolve.
       *
       * @parameter
       */
      private Dependency[] dependencies;
  
      /**
       * The path to a properties file to store the resolved artifact paths in.
       *
       * @parameter
      */
     private File propertiesFile;
 
     /**
      * Runs this mojo.
      *
      * @throws MojoExecutionException If the artifacts couldn't be resolved.
      */
     public void execute()
         throws MojoExecutionException
     {
         getLog().info( "[MAVEN-CORE-IT-LOG] Resolving artifacts" );
 
         ResolverThread thread = new ResolverThread();
         thread.start();
         while ( thread.isAlive() )
         {
             try
             {
                 thread.join();
             }
             catch ( InterruptedException e )
             {
                 e.printStackTrace();
             }
         }
 
         if ( thread.error != null )
         {
             throw new MojoExecutionException( "Failed to resolve artifacts: " + thread.error.getMessage(),
                                               thread.error );
         }
 
         if ( propertiesFile != null )
         {
             getLog().info( "[MAVEN-CORE-IT-LOG] Creating properties file " + propertiesFile );
 
             try
             {
                 propertiesFile.getParentFile().mkdirs();
 
                 try ( FileOutputStream fos = new FileOutputStream( propertiesFile ) )
                 {
                     thread.props.store( fos, "MAVEN-CORE-IT" );
                 }
             }
             catch ( IOException e )
             {
                 throw new MojoExecutionException( "Failed to create properties file: " + e.getMessage(), e );
             }
         }
     }
 
     private String getId( Artifact artifact )
     {
         artifact.isSnapshot(); // decouple from MNG-2961
         return artifact.getId();
     }
 
     class ResolverThread
         extends Thread
     {
 
         Properties props = new Properties();
 
         Exception error;
 
         public void run()
         {
             if ( dependencies != null )
             {
                 try
                 {
                     Set artifacts = new LinkedHashSet();
 
                     for ( Dependency dependency : dependencies )
                     {
                         Artifact artifact =
                             factory.createArtifactWithClassifier( dependency.getGroupId(), dependency.getArtifactId(),
                                                                   dependency.getVersion(), dependency.getType(),
                                                                   dependency.getClassifier() );
 
                         getLog().info(
                             "[MAVEN-CORE-IT-LOG] Resolving " + ResolveTransitiveMojo.this.getId( artifact ) );
 
                         artifacts.add( artifact );
                     }
 
                     Artifact origin = factory.createArtifact( "it", "it", "0.1", null, "pom" );
 
                     artifacts = resolver.resolveTransitively( artifacts, origin, remoteRepositories, localRepository,
                                                               metadataSource ).getArtifacts();
 
                     for ( Object artifact1 : artifacts )
                     {
                         Artifact artifact = (Artifact) artifact1;
 
                         if ( artifact.getFile() != null )
                         {
                             props.setProperty( ResolveTransitiveMojo.this.getId( artifact ),
                                                artifact.getFile().getPath() );
                         }
 
                         getLog().info( "[MAVEN-CORE-IT-LOG]   " + artifact.getFile() );
                     }
                 }
                 catch ( Exception e )
                 {
                     error = e;
                 }
             }
         }
     }
 
 }