package org.apache.maven.scm.provider.git;
   
   /*
    * 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.List;
  
  import org.apache.maven.scm.CommandParameters;
  import org.apache.maven.scm.ScmException;
  import org.apache.maven.scm.ScmFileSet;
  import org.apache.maven.scm.ScmResult;
  import org.apache.maven.scm.command.add.AddScmResult;
  import org.apache.maven.scm.command.blame.BlameScmResult;
  import org.apache.maven.scm.command.branch.BranchScmResult;
  import org.apache.maven.scm.command.changelog.ChangeLogScmResult;
  import org.apache.maven.scm.command.checkin.CheckInScmResult;
  import org.apache.maven.scm.command.checkout.CheckOutScmResult;
  import org.apache.maven.scm.command.diff.DiffScmResult;
  import org.apache.maven.scm.command.export.ExportScmResult;
  import org.apache.maven.scm.command.info.InfoScmResult;
  import org.apache.maven.scm.command.remoteinfo.RemoteInfoScmResult;
  import org.apache.maven.scm.command.remove.RemoveScmResult;
  import org.apache.maven.scm.command.status.StatusScmResult;
  import org.apache.maven.scm.command.tag.TagScmResult;
  import org.apache.maven.scm.command.update.UpdateScmResult;
  import org.apache.maven.scm.provider.AbstractScmProvider;
  import org.apache.maven.scm.provider.ScmProviderRepository;
  import org.apache.maven.scm.provider.git.command.GitCommand;
  import org.apache.maven.scm.provider.git.repository.GitScmProviderRepository;
  import org.apache.maven.scm.repository.ScmRepositoryException;
  import org.apache.maven.scm.repository.UnknownRepositoryStructure;
  
  /**
   * SCM Provider for git
   *
   *
   * @author <a href="mailto:evenisse@apache.org">Emmanuel Venisse</a>
   *
   */
  public abstract class AbstractGitScmProvider
      extends AbstractScmProvider
  {
  
      // ----------------------------------------------------------------------
      //
      // ----------------------------------------------------------------------
  
      /**
       * Internal class
       */
      private static class ScmUrlParserResult
      {
          private List<String> messages = new ArrayList<String>();
  
          private ScmProviderRepository repository;
      }
  
      // ----------------------------------------------------------------------
      // ScmProvider Implementation
      // ----------------------------------------------------------------------
  
      /** {@inheritDoc} */
      public String getScmSpecificFilename()
      {
          return ".git";
      }
  
      /** {@inheritDoc} */
      public ScmProviderRepository makeProviderScmRepository( String scmSpecificUrl, char delimiter )
          throws ScmRepositoryException
      {
          try
          {
              ScmUrlParserResult result = parseScmUrl( scmSpecificUrl, delimiter );
  
              if ( result.messages.size() > 0 )
              {
                  throw new ScmRepositoryException( "The scm url " + scmSpecificUrl + " is invalid.", result.messages );
              }
  
              return result.repository;
         }
         catch ( ScmException e )
         {
             // XXX We should allow throwing of SCMException.
             throw new ScmRepositoryException( "Error creating the scm repository", e );
         }
     }
 
     /** {@inheritDoc} */
     public ScmProviderRepository makeProviderScmRepository( File path )
         throws ScmRepositoryException, UnknownRepositoryStructure
     {
         if ( path == null )
         {
             throw new NullPointerException( "Path argument is null" );
         }
 
         if ( !path.isDirectory() )
         {
             throw new ScmRepositoryException( path.getAbsolutePath() + " isn't a valid directory." );
         }
 
         if ( !new File( path, ".git" ).exists() )
         {
             throw new ScmRepositoryException( path.getAbsolutePath() + " isn't a git checkout directory." );
         }
 
         try
         {
             return makeProviderScmRepository( getRepositoryURL( path ), ':' );
         }
         catch ( ScmException e )
         {
             // XXX We should allow throwing of SCMException.
             throw new ScmRepositoryException( "Error creating the scm repository", e );
         }
     }
 
     protected abstract String getRepositoryURL( File path )
         throws ScmException;
 
     /** {@inheritDoc} */
     public List<String> validateScmUrl( String scmSpecificUrl, char delimiter )
     {
         List<String> messages = new ArrayList<String>();
         try
         {
             makeProviderScmRepository( scmSpecificUrl, delimiter );
         }
         catch ( ScmRepositoryException e )
         {
             messages = e.getValidationMessages();
         }
         return messages;
     }
 
     /** {@inheritDoc} */
     public String getScmType()
     {
         return "git";
     }
 
     // ----------------------------------------------------------------------
     //
     // ----------------------------------------------------------------------
 
     /**
      * The git-submodule(1) command is available since Git 1.5.3, so modules will
      * be activated in a later stage
      */
     private ScmUrlParserResult parseScmUrl( String scmSpecificUrl, char delimiter )
         throws ScmException
     {
         ScmUrlParserResult result = new ScmUrlParserResult();
 
         result.repository = new GitScmProviderRepository( scmSpecificUrl );
 
         return result;
     }
 
     protected abstract GitCommand getAddCommand();
 
     /** {@inheritDoc} */
     public AddScmResult add( ScmProviderRepository repository, ScmFileSet fileSet, CommandParameters parameters )
         throws ScmException
     {
         return (AddScmResult) executeCommand( getAddCommand(), repository, fileSet, parameters );
     }
 
     protected abstract GitCommand getBranchCommand();
 
     /** {@inheritDoc} */
     protected BranchScmResult branch( ScmProviderRepository repository, ScmFileSet fileSet,
                                       CommandParameters parameters )
         throws ScmException
     {
         return (BranchScmResult) executeCommand( getBranchCommand(), repository, fileSet, parameters );
     }
 
     protected abstract GitCommand getChangeLogCommand();
 
     /** {@inheritDoc} */
     public ChangeLogScmResult changelog( ScmProviderRepository repository, ScmFileSet fileSet,
                                          CommandParameters parameters )
         throws ScmException
     {
         return (ChangeLogScmResult) executeCommand( getChangeLogCommand(), repository, fileSet, parameters );
     }
 
     protected abstract GitCommand getCheckInCommand();
 
     /** {@inheritDoc} */
     public CheckInScmResult checkin( ScmProviderRepository repository, ScmFileSet fileSet,
                                      CommandParameters parameters )
         throws ScmException
     {
         return (CheckInScmResult) executeCommand( getCheckInCommand(), repository, fileSet, parameters );
     }
 
     protected abstract GitCommand getCheckOutCommand();
 
     /** {@inheritDoc} */
     public CheckOutScmResult checkout( ScmProviderRepository repository, ScmFileSet fileSet,
                                        CommandParameters parameters )
         throws ScmException
     {
         return (CheckOutScmResult) executeCommand( getCheckOutCommand(), repository, fileSet, parameters );
     }
 
     protected abstract GitCommand getDiffCommand();
 
     /** {@inheritDoc} */
     public DiffScmResult diff( ScmProviderRepository repository, ScmFileSet fileSet, CommandParameters parameters )
         throws ScmException
     {
         return (DiffScmResult) executeCommand( getDiffCommand(), repository, fileSet, parameters );
     }
 
     protected abstract GitCommand getExportCommand();
 
     /** {@inheritDoc} */
     protected ExportScmResult export( ScmProviderRepository repository, ScmFileSet fileSet,
                                       CommandParameters parameters )
         throws ScmException
     {
         return (ExportScmResult) executeCommand( getExportCommand(), repository, fileSet, parameters );
     }
 
     protected abstract GitCommand getRemoveCommand();
 
     /** {@inheritDoc} */
     public RemoveScmResult remove( ScmProviderRepository repository, ScmFileSet fileSet, CommandParameters parameters )
         throws ScmException
     {
         return (RemoveScmResult) executeCommand( getRemoveCommand(), repository, fileSet, parameters );
     }
 
     protected abstract GitCommand getStatusCommand();
 
     /** {@inheritDoc} */
     public StatusScmResult status( ScmProviderRepository repository, ScmFileSet fileSet, CommandParameters parameters )
         throws ScmException
     {
         return (StatusScmResult) executeCommand( getStatusCommand(), repository, fileSet, parameters );
     }
 
     protected abstract GitCommand getTagCommand();
 
     /** {@inheritDoc} */
     public TagScmResult tag( ScmProviderRepository repository, ScmFileSet fileSet, CommandParameters parameters )
         throws ScmException
     {
         return (TagScmResult) executeCommand( getTagCommand(), repository, fileSet, parameters );
     }
 
     protected abstract GitCommand getUpdateCommand();
 
     /** {@inheritDoc} */
     public UpdateScmResult update( ScmProviderRepository repository, ScmFileSet fileSet, CommandParameters parameters )
         throws ScmException
     {
         return (UpdateScmResult) executeCommand( getUpdateCommand(), repository, fileSet, parameters );
     }
 
     protected ScmResult executeCommand( GitCommand command, ScmProviderRepository repository, ScmFileSet fileSet,
                                         CommandParameters parameters )
         throws ScmException
     {
         command.setLogger( getLogger() );
 
         return command.execute( repository, fileSet, parameters );
     }
 
     protected abstract GitCommand getInfoCommand();
 
     public InfoScmResult info( ScmProviderRepository repository, ScmFileSet fileSet, CommandParameters parameters )
         throws ScmException
     {
         GitCommand cmd = getInfoCommand();
 
         return (InfoScmResult) executeCommand( cmd, repository, fileSet, parameters );
     }
 
     /** {@inheritDoc} */
     protected BlameScmResult blame( ScmProviderRepository repository, ScmFileSet fileSet, CommandParameters parameters )
         throws ScmException
     {
         GitCommand cmd = getBlameCommand();
 
         return (BlameScmResult) executeCommand( cmd, repository, fileSet, parameters );
     }
 
     protected abstract GitCommand getBlameCommand();
 
     /** {@inheritDoc} */
     public RemoteInfoScmResult remoteInfo( ScmProviderRepository repository, ScmFileSet fileSet,
                                            CommandParameters parameters )
         throws ScmException
     {
         GitCommand cmd = getRemoteInfoCommand();
 
         return (RemoteInfoScmResult) executeCommand( cmd, repository, fileSet, parameters );
     }
 
     protected abstract GitCommand getRemoteInfoCommand();
 
 }