package org.apache.maven.plugins.dependency;
   
   /*
    * 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.List;
  import java.util.Map;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import org.apache.maven.artifact.handler.ArtifactHandler;
  import org.apache.maven.artifact.handler.manager.ArtifactHandlerManager;
  import org.apache.maven.artifact.repository.ArtifactRepository;
  import org.apache.maven.artifact.repository.ArtifactRepositoryPolicy;
  import org.apache.maven.artifact.repository.MavenArtifactRepository;
  import org.apache.maven.artifact.repository.layout.ArtifactRepositoryLayout;
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.MojoFailureException;
  import org.apache.maven.plugins.annotations.Component;
  import org.apache.maven.plugins.annotations.Mojo;
  import org.apache.maven.plugins.annotations.Parameter;
  import org.apache.maven.project.DefaultProjectBuildingRequest;
  import org.apache.maven.project.ProjectBuildingRequest;
  import org.apache.maven.repository.RepositorySystem;
  import org.apache.maven.settings.Settings;
  import org.apache.maven.shared.transfer.artifact.ArtifactCoordinate;
  import org.apache.maven.shared.transfer.artifact.DefaultArtifactCoordinate;
  import org.apache.maven.shared.transfer.artifact.resolve.ArtifactResolver;
  import org.apache.maven.shared.transfer.artifact.resolve.ArtifactResolverException;
  import org.apache.maven.shared.transfer.dependencies.DefaultDependableCoordinate;
  import org.apache.maven.shared.transfer.dependencies.DependableCoordinate;
  import org.apache.maven.shared.transfer.dependencies.resolve.DependencyResolver;
  import org.apache.maven.shared.transfer.dependencies.resolve.DependencyResolverException;
  import org.codehaus.plexus.util.StringUtils;
  
  /**
   * Resolves a single artifact, eventually transitively, from the specified remote repositories. Caveat: will always
   * check the central repository defined in the super pom. You could use a mirror entry in your <code>settings.xml</code>
   */
  @Mojo( name = "get", requiresProject = false, threadSafe = true )
  public class GetMojo
      extends AbstractMojo
  {
      private static final Pattern ALT_REPO_SYNTAX_PATTERN = Pattern.compile( "(.+)::(.*)::(.+)" );
  
      @Parameter( defaultValue = "${session}", required = true, readonly = true )
      private MavenSession session;
  
      @Component
      private ArtifactResolver artifactResolver;
  
      @Component
      private DependencyResolver dependencyResolver;
  
      @Component
      private ArtifactHandlerManager artifactHandlerManager;
  
      /**
       * Map that contains the layouts.
       */
      @Component( role = ArtifactRepositoryLayout.class )
      private Map<String, ArtifactRepositoryLayout> repositoryLayouts;
  
      /**
       * The repository system.
       */
      @Component
      private RepositorySystem repositorySystem;
  
      private DefaultDependableCoordinate coordinate = new DefaultDependableCoordinate();
  
      /**
       * The groupId of the artifact to download. Ignored if {@link #artifact} is used.
       */
      @Parameter( property = "groupId" )
      private String groupId;
  
      /**
       * The artifactId of the artifact to download. Ignored if {@link #artifact} is used.
       */
     @Parameter( property = "artifactId" )
     private String artifactId;
 
     /**
      * The version of the artifact to download. Ignored if {@link #artifact} is used.
      */
     @Parameter( property = "version" )
     private String version;
 
     /**
      * The classifier of the artifact to download. Ignored if {@link #artifact} is used.
      *
      * @since 2.3
      */
     @Parameter( property = "classifier" )
     private String classifier;
 
     /**
      * The packaging of the artifact to download. Ignored if {@link #artifact} is used.
      */
     @Parameter( property = "packaging", defaultValue = "jar" )
     private String packaging = "jar";
 
     /**
      * Repositories in the format id::[layout]::url or just url, separated by comma. ie.
      * central::default::https://repo.maven.apache.org/maven2,myrepo::::https://repo.acme.com,https://repo.acme2.com
      */
     @Parameter( property = "remoteRepositories" )
     private String remoteRepositories;
 
     /**
      * A string of the form groupId:artifactId:version[:packaging[:classifier]].
      */
     @Parameter( property = "artifact" )
     private String artifact;
 
     /**
      *
      */
     @Parameter( defaultValue = "${project.remoteArtifactRepositories}", readonly = true, required = true )
     private List<ArtifactRepository> pomRemoteRepositories;
 
     /**
      * Download transitively, retrieving the specified artifact and all of its dependencies.
      */
     @Parameter( property = "transitive", defaultValue = "true" )
     private boolean transitive = true;
 
     /**
      * Skip plugin execution completely.
      *
      * @since 2.7
      */
     @Parameter( property = "mdep.skip", defaultValue = "false" )
     private boolean skip;
 
     @Override
     public void execute()
         throws MojoExecutionException, MojoFailureException
     {
         if ( isSkip() )
         {
             getLog().info( "Skipping plugin execution" );
             return;
         }
 
         if ( coordinate.getArtifactId() == null && artifact == null )
         {
             throw new MojoFailureException( "You must specify an artifact, "
                 + "e.g. -Dartifact=org.apache.maven.plugins:maven-downloader-plugin:1.0" );
         }
         if ( artifact != null )
         {
             String[] tokens = StringUtils.split( artifact, ":" );
             if ( tokens.length < 3 || tokens.length > 5 )
             {
                 throw new MojoFailureException( "Invalid artifact, you must specify "
                     + "groupId:artifactId:version[:packaging[:classifier]] " + artifact );
             }
             coordinate.setGroupId( tokens[0] );
             coordinate.setArtifactId( tokens[1] );
             coordinate.setVersion( tokens[2] );
             if ( tokens.length >= 4 )
             {
                 coordinate.setType( tokens[3] );
             }
             if ( tokens.length == 5 )
             {
                 coordinate.setClassifier( tokens[4] );
             }
         }
 
         ArtifactRepositoryPolicy always =
             new ArtifactRepositoryPolicy( true, ArtifactRepositoryPolicy.UPDATE_POLICY_ALWAYS,
                                           ArtifactRepositoryPolicy.CHECKSUM_POLICY_WARN );
 
         List<ArtifactRepository> repoList = new ArrayList<>();
 
         if ( pomRemoteRepositories != null )
         {
             repoList.addAll( pomRemoteRepositories );
         }
 
         if ( remoteRepositories != null )
         {
             // Use the same format as in the deploy plugin id::layout::url
             String[] repos = StringUtils.split( remoteRepositories, "," );
             for ( String repo : repos )
             {
                 repoList.add( parseRepository( repo, always ) );
             }
         }
 
         try
         {
             ProjectBuildingRequest buildingRequest =
                 new DefaultProjectBuildingRequest( session.getProjectBuildingRequest() );
 
             Settings settings = session.getSettings();
             repositorySystem.injectMirror( repoList, settings.getMirrors() );
             repositorySystem.injectProxy( repoList, settings.getProxies() );
             repositorySystem.injectAuthentication( repoList, settings.getServers() );
 
             buildingRequest.setRemoteRepositories( repoList );
 
             if ( transitive )
             {
                 getLog().info( "Resolving " + coordinate + " with transitive dependencies" );
                 dependencyResolver.resolveDependencies( buildingRequest, coordinate, null );
             }
             else
             {
                 getLog().info( "Resolving " + coordinate );
                 artifactResolver.resolveArtifact( buildingRequest, toArtifactCoordinate( coordinate ) );
             }
         }
         catch ( ArtifactResolverException | DependencyResolverException e )
         {
             throw new MojoExecutionException( "Couldn't download artifact: " + e.getMessage(), e );
         }
     }
 
     private ArtifactCoordinate toArtifactCoordinate( DependableCoordinate dependableCoordinate )
     {
         ArtifactHandler artifactHandler = artifactHandlerManager.getArtifactHandler( dependableCoordinate.getType() );
         DefaultArtifactCoordinate artifactCoordinate = new DefaultArtifactCoordinate();
         artifactCoordinate.setGroupId( dependableCoordinate.getGroupId() );
         artifactCoordinate.setArtifactId( dependableCoordinate.getArtifactId() );
         artifactCoordinate.setVersion( dependableCoordinate.getVersion() );
         artifactCoordinate.setClassifier( dependableCoordinate.getClassifier() );
         artifactCoordinate.setExtension( artifactHandler.getExtension() );
         return artifactCoordinate;
     }
 
     ArtifactRepository parseRepository( String repo, ArtifactRepositoryPolicy policy )
         throws MojoFailureException
     {
         // if it's a simple url
         String id = "temp";
         ArtifactRepositoryLayout layout = getLayout( "default" );
         String url = repo;
 
         // if it's an extended repo URL of the form id::layout::url
         if ( repo.contains( "::" ) )
         {
             Matcher matcher = ALT_REPO_SYNTAX_PATTERN.matcher( repo );
             if ( !matcher.matches() )
             {
                 throw new MojoFailureException( repo, "Invalid syntax for repository: " + repo,
                                                 "Invalid syntax for repository. Use \"id::layout::url\" or \"URL\"." );
             }
 
             id = matcher.group( 1 ).trim();
             if ( !StringUtils.isEmpty( matcher.group( 2 ) ) )
             {
                 layout = getLayout( matcher.group( 2 ).trim() );
             }
             url = matcher.group( 3 ).trim();
         }
         return new MavenArtifactRepository( id, url, layout, policy, policy );
     }
 
     private ArtifactRepositoryLayout getLayout( String id )
         throws MojoFailureException
     {
         ArtifactRepositoryLayout layout = repositoryLayouts.get( id );
 
         if ( layout == null )
         {
             throw new MojoFailureException( id, "Invalid repository layout", "Invalid repository layout: " + id );
         }
 
         return layout;
     }
 
     /**
      * @return {@link #skip}
      */
     protected boolean isSkip()
     {
         return skip;
     }
 
     /**
      * @param groupId The groupId.
      */
     public void setGroupId( String groupId )
     {
         this.coordinate.setGroupId( groupId );
     }
 
     /**
      * @param artifactId The artifactId.
      */
     public void setArtifactId( String artifactId )
     {
         this.coordinate.setArtifactId( artifactId );
     }
 
     /**
      * @param version The version.
      */
     public void setVersion( String version )
     {
         this.coordinate.setVersion( version );
     }
 
     /**
      * @param classifier The classifier to be used.
      */
     public void setClassifier( String classifier )
     {
         this.coordinate.setClassifier( classifier );
     }
 
     /**
      * @param type packaging.
      */
     public void setPackaging( String type )
     {
         this.coordinate.setType( type );
     }
 
 }