package org.apache.maven.scm.manager;
   
   /*
    * 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.Date;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  import org.apache.maven.scm.ScmBranch;
  import org.apache.maven.scm.ScmBranchParameters;
  import org.apache.maven.scm.ScmException;
  import org.apache.maven.scm.ScmFileSet;
  import org.apache.maven.scm.ScmTagParameters;
  import org.apache.maven.scm.ScmVersion;
  import org.apache.maven.scm.command.add.AddScmResult;
  import org.apache.maven.scm.command.blame.BlameScmRequest;
  import org.apache.maven.scm.command.blame.BlameScmResult;
  import org.apache.maven.scm.command.branch.BranchScmResult;
  import org.apache.maven.scm.command.changelog.ChangeLogScmRequest;
  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.edit.EditScmResult;
  import org.apache.maven.scm.command.export.ExportScmResult;
  import org.apache.maven.scm.command.list.ListScmResult;
  import org.apache.maven.scm.command.mkdir.MkdirScmResult;
  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.unedit.UnEditScmResult;
  import org.apache.maven.scm.command.update.UpdateScmResult;
  import org.apache.maven.scm.provider.ScmProvider;
  import org.apache.maven.scm.provider.ScmProviderRepository;
  import org.apache.maven.scm.provider.ScmUrlUtils;
  import org.apache.maven.scm.repository.ScmRepository;
  import org.apache.maven.scm.repository.ScmRepositoryException;
  import org.apache.maven.scm.repository.UnknownRepositoryStructure;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * @author <a href="mailto:trygvis@inamo.no">Trygve Laugst&oslash;l</a>
   * @author <a href="mailto:brett@apache.org">Brett Porter</a>
   * @author <a href="mailto:evenisse@apache.org">Emmanuel Venisse</a>
   */
  public abstract class AbstractScmManager
          implements ScmManager
  {
      protected final Logger logger = LoggerFactory.getLogger( getClass() );
  
      private final Map<String, ScmProvider> scmProviders = new ConcurrentHashMap<>();
  
      private final Map<String, String> userProviderTypes = new ConcurrentHashMap<>();
  
      protected void setScmProviders( Map<String, ScmProvider> providers )
      {
          requireNonNull( providers );
          this.scmProviders.clear();
          // first provider must not be overwritten by subsequent ones if they are registered for the same key
          providers.forEach( this.scmProviders::putIfAbsent );
      }
  
      /**
       * @param providerType the type of SCM, eg. <code>svn</code>, <code>git</code>
       * @param provider     the provider that will be used for that SCM type
       * @deprecated use {@link #setScmProvider(String, ScmProvider)} instead
       */
      @Deprecated
      protected void addScmProvider( String providerType, ScmProvider provider )
      {
          setScmProvider( providerType, provider );
      }
  
      /**
       * Set a provider to be used for a type of SCM.
       * If there was already a designed provider for that type it will be replaced.
      *
      * @param providerType the type of SCM, eg. <code>svn</code>, <code>git</code>
      * @param provider     the provider that will be used for that SCM type
      */
     @Override
     public void setScmProvider( String providerType, ScmProvider provider )
     {
         requireNonNull( providerType );
         requireNonNull( provider );
         scmProviders.put( providerType, provider );
     }
 
     // ----------------------------------------------------------------------
     // ScmManager Implementation
     // ----------------------------------------------------------------------
 
     /**
      * {@inheritDoc}
      */
     @Override
     public ScmProvider getProviderByUrl( String scmUrl )
             throws ScmRepositoryException, NoSuchScmProviderException
     {
         requireNonNull( scmUrl, "The scm url cannot be null." );
 
         String providerType = ScmUrlUtils.getProvider( scmUrl );
 
         return getProviderByType( providerType );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void setScmProviderImplementation( String providerType, String providerImplementation )
     {
         requireNonNull( providerType );
         requireNonNull( providerImplementation );
         userProviderTypes.put( providerType, providerImplementation );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public ScmProvider getProviderByType( String providerType )
             throws NoSuchScmProviderException
     {
         String usedProviderType = System.getProperty( "maven.scm.provider." + providerType + ".implementation" );
 
         if ( usedProviderType == null )
         {
             usedProviderType = userProviderTypes.getOrDefault( providerType, providerType );
         }
 
         ScmProvider scmProvider = scmProviders.get( usedProviderType );
 
         if ( scmProvider == null )
         {
             throw new NoSuchScmProviderException( usedProviderType );
         }
 
         return scmProvider;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public ScmProvider getProviderByRepository( ScmRepository repository )
             throws NoSuchScmProviderException
     {
         return getProviderByType( repository.getProvider() );
     }
 
     // ----------------------------------------------------------------------
     // Repository
     // ----------------------------------------------------------------------
 
     /**
      * {@inheritDoc}
      */
     @Override
     public ScmRepository makeScmRepository( String scmUrl )
             throws ScmRepositoryException, NoSuchScmProviderException
     {
         requireNonNull( scmUrl, "The scm url cannot be null." );
 
         char delimiter = ScmUrlUtils.getDelimiter( scmUrl ).charAt( 0 );
 
         String providerType = ScmUrlUtils.getProvider( scmUrl );
 
         ScmProvider provider = getProviderByType( providerType );
 
         String scmSpecificUrl = cleanScmUrl( scmUrl.substring( providerType.length() + 5 ) );
 
         ScmProviderRepository providerRepository = provider.makeProviderScmRepository( scmSpecificUrl, delimiter );
 
         return new ScmRepository( providerType, providerRepository );
     }
 
     /**
      * Clean the SCM url by removing all ../ in path
      *
      * @param scmUrl the SCM url
      * @return the cleaned SCM url
      */
     protected String cleanScmUrl( String scmUrl )
     {
         requireNonNull( scmUrl, "The scm url cannot be null." );
 
         String pathSeparator = "";
 
         int indexOfDoubleDot = -1;
 
         // Clean Unix path
         if ( scmUrl.indexOf( "../" ) > 1 )
         {
             pathSeparator = "/";
 
             indexOfDoubleDot = scmUrl.indexOf( "../" );
         }
 
         // Clean windows path
         if ( scmUrl.indexOf( "..\\" ) > 1 )
         {
             pathSeparator = "\\";
 
             indexOfDoubleDot = scmUrl.indexOf( "..\\" );
         }
 
         if ( indexOfDoubleDot > 1 )
         {
             int startOfTextToRemove = scmUrl.substring( 0, indexOfDoubleDot - 1 ).lastIndexOf( pathSeparator );
 
             String beginUrl = "";
             if ( startOfTextToRemove >= 0 )
             {
                 beginUrl = scmUrl.substring( 0, startOfTextToRemove );
             }
 
             String endUrl = scmUrl.substring( indexOfDoubleDot + 3 );
 
             scmUrl = beginUrl + pathSeparator + endUrl;
 
             // Check if we have other double dot
             if ( scmUrl.indexOf( "../" ) > 1 || scmUrl.indexOf( "..\\" ) > 1 )
             {
                 scmUrl = cleanScmUrl( scmUrl );
             }
         }
 
         return scmUrl;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public ScmRepository makeProviderScmRepository( String providerType, File path )
             throws ScmRepositoryException, UnknownRepositoryStructure, NoSuchScmProviderException
     {
         requireNonNull( providerType, "The provider type cannot be null." );
 
         ScmProvider provider = getProviderByType( providerType );
 
         ScmProviderRepository providerRepository = provider.makeProviderScmRepository( path );
 
         return new ScmRepository( providerType, providerRepository );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public List<String> validateScmRepository( String scmUrl )
     {
         List<String> messages = new ArrayList<>( ScmUrlUtils.validate( scmUrl ) );
 
         String providerType = ScmUrlUtils.getProvider( scmUrl );
 
         ScmProvider provider;
 
         try
         {
             provider = getProviderByType( providerType );
         }
         catch ( NoSuchScmProviderException e )
         {
             messages.add( "No such provider installed '" + providerType + "'." );
 
             return messages;
         }
 
         String scmSpecificUrl = cleanScmUrl( scmUrl.substring( providerType.length() + 5 ) );
 
         List<String> providerMessages =
                 provider.validateScmUrl( scmSpecificUrl, ScmUrlUtils.getDelimiter( scmUrl ).charAt( 0 ) );
 
         requireNonNull( providerMessages, "The SCM provider cannot return null from validateScmUrl()." );
 
         messages.addAll( providerMessages );
 
         return messages;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public AddScmResult add( ScmRepository repository, ScmFileSet fileSet )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).add( repository, fileSet );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public AddScmResult add( ScmRepository repository, ScmFileSet fileSet, String message )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).add( repository, fileSet, message );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public BranchScmResult branch( ScmRepository repository, ScmFileSet fileSet, String branchName )
             throws ScmException
     {
         ScmBranchParameters scmBranchParameters = new ScmBranchParameters( "" );
         return this.getProviderByRepository( repository ).branch( repository, fileSet, branchName,
                 scmBranchParameters );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public BranchScmResult branch( ScmRepository repository, ScmFileSet fileSet, String branchName, String message )
             throws ScmException
     {
         ScmBranchParameters scmBranchParameters = new ScmBranchParameters( message );
         return this.getProviderByRepository( repository ).branch( repository, fileSet, branchName,
                 scmBranchParameters );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public ChangeLogScmResult changeLog( ScmRepository repository, ScmFileSet fileSet, Date startDate, Date endDate,
                                          int numDays, ScmBranch branch )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).changeLog( repository, fileSet, startDate, endDate, numDays,
                 branch );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public ChangeLogScmResult changeLog( ScmRepository repository, ScmFileSet fileSet, Date startDate, Date endDate,
                                          int numDays, ScmBranch branch, String datePattern )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).changeLog( repository, fileSet, startDate, endDate, numDays,
                 branch, datePattern );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public ChangeLogScmResult changeLog( ChangeLogScmRequest scmRequest )
             throws ScmException
     {
         return this.getProviderByRepository( scmRequest.getScmRepository() ).changeLog( scmRequest );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public ChangeLogScmResult changeLog( ScmRepository repository, ScmFileSet fileSet, ScmVersion startVersion,
                                          ScmVersion endVersion )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).changeLog( repository, fileSet, startVersion, endVersion );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public ChangeLogScmResult changeLog( ScmRepository repository, ScmFileSet fileSet, ScmVersion startRevision,
                                          ScmVersion endRevision, String datePattern )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).changeLog( repository, fileSet, startRevision, endRevision,
                 datePattern );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public CheckInScmResult checkIn( ScmRepository repository, ScmFileSet fileSet, String message )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).checkIn( repository, fileSet, message );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public CheckInScmResult checkIn( ScmRepository repository, ScmFileSet fileSet, ScmVersion revision, String message )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).checkIn( repository, fileSet, revision, message );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public CheckOutScmResult checkOut( ScmRepository repository, ScmFileSet fileSet )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).checkOut( repository, fileSet );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public CheckOutScmResult checkOut( ScmRepository repository, ScmFileSet fileSet, ScmVersion version )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).checkOut( repository, fileSet, version );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public CheckOutScmResult checkOut( ScmRepository repository, ScmFileSet fileSet, boolean recursive )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).checkOut( repository, fileSet, recursive );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public CheckOutScmResult checkOut( ScmRepository repository, ScmFileSet fileSet, ScmVersion version,
                                        boolean recursive )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).checkOut( repository, fileSet, version, recursive );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public DiffScmResult diff( ScmRepository repository, ScmFileSet fileSet, ScmVersion startVersion,
                                ScmVersion endVersion )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).diff( repository, fileSet, startVersion, endVersion );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public EditScmResult edit( ScmRepository repository, ScmFileSet fileSet )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).edit( repository, fileSet );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public ExportScmResult export( ScmRepository repository, ScmFileSet fileSet )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).export( repository, fileSet );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public ExportScmResult export( ScmRepository repository, ScmFileSet fileSet, ScmVersion version )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).export( repository, fileSet, version );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public ExportScmResult export( ScmRepository repository, ScmFileSet fileSet, String outputDirectory )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).export( repository, fileSet, (ScmVersion) null,
                 outputDirectory );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public ExportScmResult export( ScmRepository repository, ScmFileSet fileSet, ScmVersion version,
                                    String outputDirectory )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).export( repository, fileSet, version, outputDirectory );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public ListScmResult list( ScmRepository repository, ScmFileSet fileSet, boolean recursive, ScmVersion version )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).list( repository, fileSet, recursive, version );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public MkdirScmResult mkdir( ScmRepository repository, ScmFileSet fileSet, String message, boolean createInLocal )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).mkdir( repository, fileSet, message, createInLocal );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public RemoveScmResult remove( ScmRepository repository, ScmFileSet fileSet, String message )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).remove( repository, fileSet, message );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public StatusScmResult status( ScmRepository repository, ScmFileSet fileSet )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).status( repository, fileSet );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public TagScmResult tag( ScmRepository repository, ScmFileSet fileSet, String tagName )
             throws ScmException
     {
         return this.tag( repository, fileSet, tagName, "" );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public TagScmResult tag( ScmRepository repository, ScmFileSet fileSet, String tagName, String message )
             throws ScmException
     {
         ScmTagParameters scmTagParameters = new ScmTagParameters( message );
         return this.getProviderByRepository( repository ).tag( repository, fileSet, tagName, scmTagParameters );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public UnEditScmResult unedit( ScmRepository repository, ScmFileSet fileSet )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).unedit( repository, fileSet );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public UpdateScmResult update( ScmRepository repository, ScmFileSet fileSet )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).update( repository, fileSet );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public UpdateScmResult update( ScmRepository repository, ScmFileSet fileSet, ScmVersion version )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).update( repository, fileSet, version );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public UpdateScmResult update( ScmRepository repository, ScmFileSet fileSet, boolean runChangelog )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).update( repository, fileSet, runChangelog );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public UpdateScmResult update( ScmRepository repository, ScmFileSet fileSet, ScmVersion version,
                                    boolean runChangelog )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).update( repository, fileSet, version, runChangelog );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public UpdateScmResult update( ScmRepository repository, ScmFileSet fileSet, String datePattern )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).update( repository, fileSet, (ScmVersion) null, datePattern );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public UpdateScmResult update( ScmRepository repository, ScmFileSet fileSet, ScmVersion version,
                                    String datePattern )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).update( repository, fileSet, version, datePattern );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public UpdateScmResult update( ScmRepository repository, ScmFileSet fileSet, Date lastUpdate )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).update( repository, fileSet, (ScmVersion) null, lastUpdate );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public UpdateScmResult update( ScmRepository repository, ScmFileSet fileSet, ScmVersion version, Date lastUpdate )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).update( repository, fileSet, version, lastUpdate );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public UpdateScmResult update( ScmRepository repository, ScmFileSet fileSet, Date lastUpdate, String datePattern )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).update( repository, fileSet, (ScmVersion) null, lastUpdate,
                 datePattern );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public UpdateScmResult update( ScmRepository repository, ScmFileSet fileSet, ScmVersion version, Date lastUpdate,
                                    String datePattern )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).update( repository, fileSet, version, lastUpdate,
                 datePattern );
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public BlameScmResult blame( ScmRepository repository, ScmFileSet fileSet, String filename )
             throws ScmException
     {
         return this.getProviderByRepository( repository ).blame( repository, fileSet, filename );
     }
 
     @Override
     public BlameScmResult blame( BlameScmRequest blameScmRequest )
             throws ScmException
     {
         return this.getProviderByRepository( blameScmRequest.getScmRepository() ).blame( blameScmRequest );
     }
 }