package org.apache.maven.plugin.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.io.File;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import org.apache.commons.io.FileUtils;
  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.repository.ArtifactRepositoryFactory;
  import org.apache.maven.artifact.repository.ArtifactRepositoryPolicy;
  import org.apache.maven.artifact.repository.layout.ArtifactRepositoryLayout;
  import org.apache.maven.artifact.resolver.AbstractArtifactResolutionException;
  import org.apache.maven.artifact.resolver.ArtifactResolver;
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.MojoFailureException;
  import org.codehaus.plexus.util.StringUtils;
  
  /**
   * Downloads a single artifact 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 settings.xml
   * 
   * @goal get
   * @requiresProject false
   */
  public class GetMojo
      extends AbstractMojo
  {
      private static final Pattern ALT_REPO_SYNTAX_PATTERN = Pattern.compile( "(.+)::(.*)::(.+)" );
  
      /**
       * @component
       * @readonly
       */
      private ArtifactFactory artifactFactory;
  
      /**
       * @component
       * @readonly
       */
      private ArtifactResolver artifactResolver;
  
      /**
       * @component
       * @readonly
       */
      private ArtifactRepositoryFactory artifactRepositoryFactory;
  
      /**
       * Map that contains the layouts.
       *
       * @component role="org.apache.maven.artifact.repository.layout.ArtifactRepositoryLayout"
       */
      private Map repositoryLayouts;
  
      /**
       * @component
       * @readonly
       */
      private ArtifactMetadataSource source;
  
      /**
       *
       * @parameter expression="${localRepository}"
       * @readonly
       */
      private ArtifactRepository localRepository;
  
      /**
       * The groupId of the artifact to download. Ignored if {@link #artifact} is used.
       * @parameter expression="${groupId}"
      */
     private String groupId;
 
     /**
      * The artifactId of the artifact to download. Ignored if {@link #artifact} is used.
      * @parameter expression="${artifactId}"
      */
     private String artifactId;
 
     /**
      * The version of the artifact to download. Ignored if {@link #artifact} is used.
      * @parameter expression="${version}"
      */
     private String version;
 
     /**
      * The classifier of the artifact to download. Ignored if {@link #artifact} is used.
      * @parameter expression="${classifier}"
      * @since 2.3
      */
     private String classifier;
 
     /**
      * The packaging of the artifact to download. Ignored if {@link #artifact} is used.
      * @parameter expression="${packaging}" default-value="jar"
      */
     private String packaging = "jar";
 
     /**
      * The id of the repository from which we'll download the artifact
      * @parameter expression="${repoId}" default-value="temp"
      * @deprecated Use remoteRepositories
      */
     private String repositoryId = "temp";
 
     /**
      * The url of the repository from which we'll download the artifact. DEPRECATED Use remoteRepositories
      * 
      * @deprecated Use remoteRepositories
      * @parameter expression="${repoUrl}"
      */
     private String repositoryUrl;
 
     /**
      * Repositories in the format id::[layout]::url or just url, separated by comma.
      * ie. central::default::http://repo1.maven.apache.org/maven2,myrepo::::http://repo.acme.com,http://repo.acme2.com
      * 
      * @parameter expression="${remoteRepositories}"
      */
     private String remoteRepositories;
 
     /**
      * A string of the form groupId:artifactId:version[:packaging][:classifier].
      * 
      * @parameter expression="${artifact}"
      */
     private String artifact;
 
     /**
      * The destination file to copy the artifact to, if other than the local repository
      * @parameter expression="${dest}"
      * @since 2.4
      */
     private String destination;
 
     /**
      *
      * @parameter expression="${project.remoteArtifactRepositories}"
      * @required
      * @readonly
      */
     private List pomRemoteRepositories;
 
     /**
      * Download transitively, retrieving the specified artifact and all of its dependencies.
      * @parameter expression="${transitive}" default-value=true
      */
     private boolean transitive = true;
 
     public void execute()
         throws MojoExecutionException, MojoFailureException
     {
 
         if ( artifactId == 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 );
             }
             groupId = tokens[0];
             artifactId = tokens[1];
             version = tokens[2];
             if ( tokens.length >= 4 )
             {
                 packaging = tokens[3];
             }
             if ( tokens.length == 5 )
             {
                 classifier = tokens[4];
             }
             else
             {
                 classifier = null;
             }
         }
 
         Artifact toDownload = classifier == null
             ? artifactFactory.createBuildArtifact( groupId, artifactId, version, packaging )
             : artifactFactory.createArtifactWithClassifier( groupId, artifactId, version, packaging, classifier );
         Artifact dummyOriginatingArtifact =
             artifactFactory.createBuildArtifact( "org.apache.maven.plugins", "maven-downloader-plugin", "1.0", "jar" );
 
         ArtifactRepositoryPolicy always =
             new ArtifactRepositoryPolicy( true, ArtifactRepositoryPolicy.UPDATE_POLICY_ALWAYS,
                                           ArtifactRepositoryPolicy.CHECKSUM_POLICY_WARN );
 
         List<ArtifactRepository> repoList = new ArrayList<ArtifactRepository>();
 
         if ( pomRemoteRepositories != null )
         {
             repoList.addAll( pomRemoteRepositories );
         }
 
         if ( remoteRepositories != null )
         {
             // Use the same format as in the deploy plugin id::layout::url
             List<String> repos = Arrays.asList( StringUtils.split( remoteRepositories, "," ) );
             for ( String repo : repos )
             {
                 repoList.add( parseRepository( repo, always ) );
             }
         }
 
         if ( repositoryUrl != null )
         {
             getLog().warn( "repositoryUrl parameter is deprecated. Use remoteRepositories instead" );
             ArtifactRepository remoteRepo =
                 artifactRepositoryFactory.createArtifactRepository( repositoryId, repositoryUrl,
                                                                     getLayout( "default" ), always, always );
             repoList.add( remoteRepo );
         }
 
         try
         {
             if ( transitive )
             {
                 artifactResolver.resolveTransitively( Collections.singleton( toDownload ), dummyOriginatingArtifact,
                                                       repoList, localRepository, source );
             }
             else
             {
                 artifactResolver.resolve( toDownload, repoList, localRepository );
             }
         }
         catch ( AbstractArtifactResolutionException e )
         {
             throw new MojoExecutionException( "Couldn't download artifact: " + e.getMessage(), e );
         }
 
         if ( destination != null )
         {
             File src = toDownload.getFile();
             File dest = new File( destination );
             if ( getLog().isInfoEnabled() )
             {
                 getLog().info( "Copying " + src.getAbsolutePath() + " to " + dest.getAbsolutePath() );
             }
             try
             {
                 FileUtils.copyFile( toDownload.getFile(), new File( destination ) );
             }
             catch ( IOException e )
             {
                 throw new MojoExecutionException( "Couldn't copy downloaded artifact from " + src.getAbsolutePath()
                     + " to " + dest.getAbsolutePath() + " : " + e.getMessage(), e );
             }
         }
     }
 
     ArtifactRepository parseRepository( String repo, ArtifactRepositoryPolicy policy )
         throws MojoFailureException
     {
         // if it's a simple url
         String id = repositoryId;
         ArtifactRepositoryLayout layout = getLayout( "default" );
         String url = repo;
 
         // if it's an extended repo URL of the form id::layout::url
         if ( repo.indexOf( "::" ) >= 0 )
         {
             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 artifactRepositoryFactory.createArtifactRepository( id, url, layout, policy, policy );
     }
 
     private ArtifactRepositoryLayout getLayout( String id )
         throws MojoFailureException
     {
         ArtifactRepositoryLayout layout = (ArtifactRepositoryLayout) repositoryLayouts.get( id );
 
         if ( layout == null )
         {
             throw new MojoFailureException( id, "Invalid repository layout", "Invalid repository layout: " + id );
         }
 
         return layout;
     }
 }