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.repository.ArtifactRepository;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugins.dependency.AbstractDependencyMojo;
  import org.apache.maven.plugins.annotations.Component;
  import org.apache.maven.plugins.annotations.Mojo;
  import org.apache.maven.plugins.annotations.ResolutionScope;
  import org.apache.maven.shared.dependencies.collect.CollectorResult;
  import org.apache.maven.shared.dependencies.collect.DependencyCollector;
  import org.apache.maven.shared.dependencies.collect.DependencyCollectorException;
  
  /**
   * Goal that resolves all project dependencies and then lists the repositories used by the build and by the transitive
   * dependencies
   *
   * @author <a href="mailto:brianf@apache.org">Brian Fox</a>
   * @since 2.2
   */
  @Mojo( name = "list-repositories", requiresDependencyResolution = ResolutionScope.TEST, threadSafe = true )
  public class ListRepositoriesMojo
      extends AbstractDependencyMojo
  {
      /**
       * Dependency collector, needed to resolve dependencies.
       */
      @Component( role = DependencyCollector.class )
      private DependencyCollector dependencyCollector;
  
      /**
       * Displays a list of the repositories used by this build.
       *
       * @throws MojoExecutionException with a message if an error occurs.
       */
      @Override
      protected void doExecute()
          throws MojoExecutionException
      {
          try
          {
              CollectorResult collectResult =
                  dependencyCollector.collectDependencies( session.getProjectBuildingRequest(), getProject().getModel() );
  
              this.getLog().info( "Repositories used by this build:" );
  
              for ( ArtifactRepository repo : collectResult.getRemoteRepositories() )
              {
                  this.getLog().info( repo.toString() );
              }
          }
          catch ( DependencyCollectorException e )
          {
              throw new MojoExecutionException( "Unable to resolve artifacts", e );
          }
      }
  
  }