package org.apache.maven.scm.provider.bazaar.command.update;
   
   /*
    * 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.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.maven.scm.ChangeSet;
  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.ScmVersion;
  import org.apache.maven.scm.command.Command;
  import org.apache.maven.scm.command.changelog.ChangeLogCommand;
  import org.apache.maven.scm.command.update.AbstractUpdateCommand;
  import org.apache.maven.scm.command.update.UpdateScmResult;
  import org.apache.maven.scm.command.update.UpdateScmResultWithRevision;
  import org.apache.maven.scm.provider.ScmProviderRepository;
  import org.apache.maven.scm.provider.bazaar.BazaarUtils;
  import org.apache.maven.scm.provider.bazaar.command.BazaarConstants;
  import org.apache.maven.scm.provider.bazaar.command.BazaarConsumer;
  import org.apache.maven.scm.provider.bazaar.command.changelog.BazaarChangeLogCommand;
  import org.apache.maven.scm.provider.bazaar.command.diff.BazaarDiffConsumer;
  import org.codehaus.plexus.util.StringUtils;
  
  /**
   * @author <a href="mailto:torbjorn@smorgrav.org">Torbj�rn Eikli Sm�rgrav</a>
   *
   */
  public class BazaarUpdateCommand
      extends AbstractUpdateCommand
      implements Command
  {
  
      /** {@inheritDoc} */
      protected UpdateScmResult executeUpdateCommand( ScmProviderRepository repo, ScmFileSet fileSet, ScmVersion version )
          throws ScmException
      {
  
          if ( version != null && StringUtils.isNotEmpty( version.getName() ) )
          {
              throw new ScmException( "This provider can't handle tags." );
          }
  
          File workingDir = fileSet.getBasedir();
  
          // Update branch
          String[] updateCmd = new String[] { BazaarConstants.PULL_CMD };
          ScmResult updateResult = BazaarUtils.execute( new BazaarConsumer( getLogger() ), getLogger(), workingDir,
                                                        updateCmd );
  
          if ( !updateResult.isSuccess() )
          {
              return new UpdateScmResult( null, null, updateResult );
          }
  
          // Find changes from last revision
          int currentRevision = BazaarUtils.getCurrentRevisionNumber( getLogger(), workingDir );
          int previousRevision = currentRevision - 1;
          String[] diffCmd =
              new String[] { BazaarConstants.DIFF_CMD, BazaarConstants.REVISION_OPTION, "" + previousRevision };
          BazaarDiffConsumer diffConsumer = new BazaarDiffConsumer( getLogger(), workingDir );
          ScmResult diffResult = BazaarUtils.execute( diffConsumer, getLogger(), workingDir, diffCmd );
  
          // Now translate between diff and update file status
          List<ScmFile> updatedFiles = new ArrayList<ScmFile>();
          List<CharSequence> changes = new ArrayList<CharSequence>();
          List<ScmFile> diffFiles = diffConsumer.getChangedFiles();
          Map<String, CharSequence> diffChanges = diffConsumer.getDifferences();
          for ( Iterator<ScmFile> it = diffFiles.iterator(); it.hasNext(); )
          {
              ScmFile file = it.next();
              changes.add( diffChanges.get( file ) );
              if ( file.getStatus() == ScmFileStatus.MODIFIED )
              {
                  updatedFiles.add( new ScmFile( file.getPath(), ScmFileStatus.PATCHED ) );
              }
             else
             {
                 updatedFiles.add( file );
             }
         }
 
         return new UpdateScmResultWithRevision( updatedFiles, new ArrayList<ChangeSet>(0), String.valueOf( currentRevision ), diffResult );
     }
 
     /** {@inheritDoc} */
     protected ChangeLogCommand getChangeLogCommand()
     {
         BazaarChangeLogCommand command = new BazaarChangeLogCommand();
         command.setLogger( getLogger() );
         return command;
     }
 }