package org.eclipse.aether.transport.wagon;
   
   /*
    * 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.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.File;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.net.URI;
  import java.nio.charset.StandardCharsets;
  import java.util.Map;
  import java.util.Properties;
  
  import org.apache.maven.wagon.AbstractWagon;
  import org.apache.maven.wagon.ConnectionException;
  import org.apache.maven.wagon.InputData;
  import org.apache.maven.wagon.OutputData;
  import org.apache.maven.wagon.ResourceDoesNotExistException;
  import org.apache.maven.wagon.TransferFailedException;
  import org.apache.maven.wagon.authentication.AuthenticationException;
  import org.apache.maven.wagon.authorization.AuthorizationException;
  import org.apache.maven.wagon.events.TransferEvent;
  import org.apache.maven.wagon.resource.Resource;
  
  /**
   */
  public class MemWagon
      extends AbstractWagon
      implements Configurable
  {
  
      private Map<String, String> fs;
  
      private Properties headers;
  
      private Object config;
  
      public void setConfiguration( Object config )
      {
          this.config = config;
      }
  
      public Object getConfiguration()
      {
          return config;
      }
  
      public void setHttpHeaders( Properties httpHeaders )
      {
          headers = httpHeaders;
      }
  
      @Override
      protected void openConnectionInternal()
          throws ConnectionException, AuthenticationException
      {
          fs =
              MemWagonUtils.openConnection( this, getAuthenticationInfo(),
                                            getProxyInfo( "mem", getRepository().getHost() ), headers );
      }
  
      @Override
      protected void closeConnection()
          throws ConnectionException
      {
          fs = null;
      }
  
      private String getData( String resource )
      {
          return fs.get( URI.create( resource ).getSchemeSpecificPart() );
      }
  
      @Override
      public boolean resourceExists( String resourceName )
          throws TransferFailedException, AuthorizationException
      {
          String data = getData( resourceName );
          return data != null;
      }
  
     public void get( String resourceName, File destination )
         throws TransferFailedException, ResourceDoesNotExistException, AuthorizationException
     {
         getIfNewer( resourceName, destination, 0 );
     }
 
     public boolean getIfNewer( String resourceName, File destination, long timestamp )
         throws TransferFailedException, ResourceDoesNotExistException, AuthorizationException
     {
         Resource resource = new Resource( resourceName );
         fireGetInitiated( resource, destination );
         resource.setLastModified( timestamp );
         getTransfer( resource, destination, getInputStream( resource ) );
         return true;
     }
 
     protected InputStream getInputStream( Resource resource )
         throws TransferFailedException, ResourceDoesNotExistException, AuthorizationException
     {
         InputData inputData = new InputData();
         inputData.setResource( resource );
         try
         {
             fillInputData( inputData );
         }
         catch ( TransferFailedException | AuthorizationException | ResourceDoesNotExistException e )
         {
             fireTransferError( resource, e, TransferEvent.REQUEST_GET );
             cleanupGetTransfer( resource );
             throw e;
         }
         finally
         {
             if ( inputData.getInputStream() == null )
             {
                 cleanupGetTransfer( resource );
             }
         }
         return inputData.getInputStream();
     }
 
     protected void fillInputData( InputData inputData )
         throws TransferFailedException, ResourceDoesNotExistException, AuthorizationException
     {
         String data = getData( inputData.getResource().getName() );
         if ( data == null )
         {
             throw new ResourceDoesNotExistException( "Missing resource: " + inputData.getResource().getName() );
         }
         byte[] bytes = data.getBytes( StandardCharsets.UTF_8 );
         inputData.getResource().setContentLength( bytes.length );
         inputData.setInputStream( new ByteArrayInputStream( bytes ) );
     }
 
     public void put( File source, String resourceName )
         throws TransferFailedException, ResourceDoesNotExistException, AuthorizationException
     {
         Resource resource = new Resource( resourceName );
         firePutInitiated( resource, source );
         resource.setContentLength( source.length() );
         resource.setLastModified( source.lastModified() );
         OutputStream os = getOutputStream( resource );
         putTransfer( resource, source, os, true );
     }
 
     protected OutputStream getOutputStream( Resource resource )
         throws TransferFailedException
     {
         OutputData outputData = new OutputData();
         outputData.setResource( resource );
         try
         {
             fillOutputData( outputData );
         }
         catch ( TransferFailedException e )
         {
             fireTransferError( resource, e, TransferEvent.REQUEST_PUT );
             throw e;
         }
         finally
         {
             if ( outputData.getOutputStream() == null )
             {
                 cleanupPutTransfer( resource );
             }
         }
 
         return outputData.getOutputStream();
     }
 
     protected void fillOutputData( OutputData outputData )
         throws TransferFailedException
     {
         outputData.setOutputStream( new ByteArrayOutputStream() );
     }
 
     @Override
     protected void finishPutTransfer( Resource resource, InputStream input, OutputStream output )
         throws TransferFailedException, AuthorizationException, ResourceDoesNotExistException
     {
         String data = new String( ( (ByteArrayOutputStream) output ).toByteArray(), StandardCharsets.UTF_8 );
         fs.put( URI.create( resource.getName() ).getSchemeSpecificPart(), data );
     }
 
 }