package org.apache.maven.scm.provider.git.jgit.command.tag;
   
   /*
    * 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.scm.ScmException;
  import org.apache.maven.scm.ScmFile;
  import org.apache.maven.scm.ScmFileSet;
  import org.apache.maven.scm.ScmFileStatus;
  import org.apache.maven.scm.ScmResult;
  import org.apache.maven.scm.ScmTagParameters;
  import org.apache.maven.scm.command.tag.AbstractTagCommand;
  import org.apache.maven.scm.command.tag.TagScmResult;
  import org.apache.maven.scm.provider.ScmProviderRepository;
  import org.apache.maven.scm.provider.git.command.GitCommand;
  import org.apache.maven.scm.provider.git.jgit.command.JGitUtils;
  import org.apache.maven.scm.provider.git.repository.GitScmProviderRepository;
  import org.codehaus.plexus.util.StringUtils;
  import org.eclipse.jgit.api.Git;
  import org.eclipse.jgit.lib.Constants;
  import org.eclipse.jgit.lib.Ref;
  import org.eclipse.jgit.revwalk.RevCommit;
  import org.eclipse.jgit.revwalk.RevWalk;
  import org.eclipse.jgit.transport.RefSpec;
  import org.eclipse.jgit.treewalk.TreeWalk;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * @author <a href="mailto:struberg@yahoo.de">Mark Struberg</a>
   * @author Dominik Bartholdi (imod)
   * @since 1.9
   */
  public class JGitTagCommand
      extends AbstractTagCommand
      implements GitCommand
  {
  
      public ScmResult executeTagCommand( ScmProviderRepository repo, ScmFileSet fileSet, String tag, String message )
          throws ScmException
      {
          return executeTagCommand( repo, fileSet, tag, new ScmTagParameters( message ) );
      }
  
      /**
       * {@inheritDoc}
       */
      public ScmResult executeTagCommand( ScmProviderRepository repo, ScmFileSet fileSet, String tag,
                                          ScmTagParameters scmTagParameters )
          throws ScmException
      {
          if ( tag == null || StringUtils.isEmpty( tag.trim() ) )
          {
              throw new ScmException( "tag name must be specified" );
          }
  
          if ( !fileSet.getFileList().isEmpty() )
          {
              throw new ScmException( "This provider doesn't support tagging subsets of a directory" );
          }
  
          String escapedTagName = tag.trim().replace( ' ', '_' );
  
          Git git = null;
          try
          {
              git = Git.open( fileSet.getBasedir() );
  
              // tag the revision
              String tagMessage = scmTagParameters.getMessage();
              Ref tagRef = git.tag().setName( escapedTagName ).setMessage( tagMessage ).setForceUpdate( false ).call();
  
              if ( repo.isPushChanges() )
              {
                  getLogger().info( "push tag [" + escapedTagName + "] to remote..." );
                  JGitUtils.push( getLogger(), git, (GitScmProviderRepository) repo, new RefSpec( Constants.R_TAGS
                      + escapedTagName ) );
              }
  
              // search for the tagged files
              RevWalk revWalk = new RevWalk( git.getRepository() );
              RevCommit commit = revWalk.parseCommit( tagRef.getObjectId() );
             revWalk.release();
 
             final TreeWalk walk = new TreeWalk( git.getRepository() );
             walk.reset(); // drop the first empty tree, which we do not need here
             walk.setRecursive( true );
             walk.addTree( commit.getTree() );
 
             List<ScmFile> taggedFiles = new ArrayList<ScmFile>();
             while ( walk.next() )
             {
                 taggedFiles.add( new ScmFile( walk.getPathString(), ScmFileStatus.CHECKED_OUT ) );
             }
             walk.release();
 
             return new TagScmResult( "JGit tag", taggedFiles );
         }
         catch ( Exception e )
         {
             throw new ScmException( "JGit tag failure!", e );
         }
         finally
         {
             JGitUtils.closeRepo( git );
         }
     }
 
 }