package org.eclipse.aether.transport.file;
   
   /*
    * 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.nio.file.Files;
  
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.spi.connector.transport.AbstractTransporter;
  import org.eclipse.aether.spi.connector.transport.GetTask;
  import org.eclipse.aether.spi.connector.transport.PeekTask;
  import org.eclipse.aether.spi.connector.transport.PutTask;
  import org.eclipse.aether.spi.connector.transport.TransportTask;
  import org.eclipse.aether.transfer.NoTransporterException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * A transporter using {@link java.io.File}.
   */
  final class FileTransporter
      extends AbstractTransporter
  {
  
      private static final Logger LOGGER = LoggerFactory.getLogger( FileTransporter.class );
  
      private final File basedir;
  
      FileTransporter( RemoteRepository repository )
          throws NoTransporterException
      {
          if ( !"file".equalsIgnoreCase( repository.getProtocol() ) )
          {
              throw new NoTransporterException( repository );
          }
          basedir = new File( PathUtils.basedir( repository.getUrl() ) ).getAbsoluteFile();
      }
  
      File getBasedir()
      {
          return basedir;
      }
  
      public int classify( Throwable error )
      {
          if ( error instanceof ResourceNotFoundException )
          {
              return ERROR_NOT_FOUND;
          }
          return ERROR_OTHER;
      }
  
      @Override
      protected void implPeek( PeekTask task )
          throws Exception
      {
          getFile( task, true );
      }
  
      @Override
      protected void implGet( GetTask task )
          throws Exception
      {
          File file = getFile( task, true );
          utilGet( task, Files.newInputStream( file.toPath() ), true, file.length(), false );
      }
  
      @Override
      protected void implPut( PutTask task )
          throws Exception
      {
          File file = getFile( task, false );
          file.getParentFile().mkdirs();
          try
          {
              utilPut( task, Files.newOutputStream( file.toPath() ), true );
          }
          catch ( Exception e )
          {
              if ( !file.delete() && file.exists() )
              {
                  LOGGER.debug( "Could not delete partial file {}", file );
             }
             throw e;
         }
     }
 
     private File getFile( TransportTask task, boolean required )
         throws Exception
     {
         String path = task.getLocation().getPath();
         if ( path.contains( "../" ) )
         {
             throw new IllegalArgumentException( "illegal resource path: " + path );
         }
         File file = new File( basedir, path );
         if ( required && !file.exists() )
         {
             throw new ResourceNotFoundException( "Could not locate " + file );
         }
         return file;
     }
 
     @Override
     protected void implClose()
     {
     }
 
 }