package org.apache.maven.plugin.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.resolver.ArtifactResolutionException;
  import org.apache.maven.artifact.resolver.ArtifactResolutionResult;
  import org.apache.maven.artifact.resolver.ResolutionNode;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.dependency.AbstractDependencyMojo;
  import org.apache.maven.plugins.annotations.Mojo;
  import org.apache.maven.plugins.annotations.ResolutionScope;
  import org.apache.maven.shared.artifact.filter.ScopeArtifactFilter;
  
  import java.util.ArrayList;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.Set;
  
  /**
   * 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>
   * @version $Id: GoOfflineMojo.java 728546 2008-12-21 22:56:51Z bentmann $
   * @since 2.2
   */
  @Mojo( name = "list-repositories", requiresDependencyResolution = ResolutionScope.TEST )
  public class ListRepositoriesMojo
      extends AbstractDependencyMojo
  {
      /**
       * Displays a list of the repositories used by this build.
       *
       * @throws MojoExecutionException with a message if an error occurs.
       */
      public void execute()
          throws MojoExecutionException
      {
          try
          {
              ArtifactResolutionResult result =
                  this.artifactCollector.collect( project.getArtifacts(), project.getArtifact(), this.getLocal(),
                                                  this.remoteRepos, this.artifactMetadataSource,
                                                  new ScopeArtifactFilter( Artifact.SCOPE_TEST ), new ArrayList() );
              Set repos = new HashSet();
              Set<ResolutionNode> nodes = result.getArtifactResolutionNodes();
              for ( ResolutionNode node : nodes )
              {
                  repos.addAll( node.getRemoteRepositories() );
              }
  
              this.getLog().info( "Repositories Used by this build:" );
              for ( Iterator i = repos.iterator(); i.hasNext(); )
              {
                  this.getLog().info( i.next().toString() );
              }
          }
          catch ( ArtifactResolutionException e )
          {
              throw new MojoExecutionException( "Unable to resolve artifacts", e );
          }
      }
  }