package org.eclipse.aether.internal.impl;
   
   /*
    * 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.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  import static java.util.Objects.requireNonNull;
  import java.util.Set;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.impl.RepositoryConnectorProvider;
  import org.eclipse.aether.repository.Authentication;
  import org.eclipse.aether.repository.Proxy;
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.spi.connector.RepositoryConnector;
  import org.eclipse.aether.spi.connector.RepositoryConnectorFactory;
  import org.eclipse.aether.spi.locator.Service;
  import org.eclipse.aether.spi.locator.ServiceLocator;
  import org.eclipse.aether.transfer.NoRepositoryConnectorException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   */
  @Named
  public class DefaultRepositoryConnectorProvider
      implements RepositoryConnectorProvider, Service
  {
  
      private static final Logger LOGGER = LoggerFactory.getLogger( DefaultRepositoryConnectorProvider.class );
  
      private Collection<RepositoryConnectorFactory> connectorFactories = new ArrayList<>();
  
      public DefaultRepositoryConnectorProvider()
      {
          // enables default constructor
      }
  
      @Inject
      DefaultRepositoryConnectorProvider( Set<RepositoryConnectorFactory> connectorFactories )
      {
          setRepositoryConnectorFactories( connectorFactories );
      }
  
      public void initService( ServiceLocator locator )
      {
          connectorFactories = locator.getServices( RepositoryConnectorFactory.class );
      }
  
      public DefaultRepositoryConnectorProvider addRepositoryConnectorFactory( RepositoryConnectorFactory factory )
      {
          connectorFactories.add( requireNonNull( factory, "repository connector factory cannot be null" ) );
          return this;
      }
  
      public DefaultRepositoryConnectorProvider setRepositoryConnectorFactories(
              Collection<RepositoryConnectorFactory> factories )
      {
          if ( factories == null )
          {
              this.connectorFactories = new ArrayList<>();
          }
          else
          {
              this.connectorFactories = factories;
          }
          return this;
      }
  
      public RepositoryConnector newRepositoryConnector( RepositorySystemSession session, RemoteRepository repository )
          throws NoRepositoryConnectorException
      {
          requireNonNull( repository, "remote repository cannot be null" );
  
          PrioritizedComponents<RepositoryConnectorFactory> factories = new PrioritizedComponents<>( session );
          for ( RepositoryConnectorFactory factory : this.connectorFactories )
          {
              factories.add( factory, factory.getPriority() );
         }
 
         List<NoRepositoryConnectorException> errors = new ArrayList<>();
         for ( PrioritizedComponent<RepositoryConnectorFactory> factory : factories.getEnabled() )
         {
             try
             {
                 RepositoryConnector connector = factory.getComponent().newInstance( session, repository );
 
                 if ( LOGGER.isDebugEnabled() )
                 {
                     StringBuilder buffer = new StringBuilder( 256 );
                     buffer.append( "Using connector " ).append( connector.getClass().getSimpleName() );
                     Utils.appendClassLoader( buffer, connector );
                     buffer.append( " with priority " ).append( factory.getPriority() );
                     buffer.append( " for " ).append( repository.getUrl() );
 
                     Authentication auth = repository.getAuthentication();
                     if ( auth != null )
                     {
                         buffer.append( " with " ).append( auth );
                     }
 
                     Proxy proxy = repository.getProxy();
                     if ( proxy != null )
                     {
                         buffer.append( " via " ).append( proxy.getHost() ).append( ':' ).append( proxy.getPort() );
 
                         auth = proxy.getAuthentication();
                         if ( auth != null )
                         {
                             buffer.append( " with " ).append( auth );
                         }
                     }
 
                     LOGGER.debug( buffer.toString() );
                 }
 
                 return connector;
             }
             catch ( NoRepositoryConnectorException e )
             {
                 // continue and try next factory
                 errors.add( e );
             }
         }
         if ( LOGGER.isDebugEnabled() && errors.size() > 1 )
         {
             for ( Exception e : errors )
             {
                 LOGGER.debug( "Could not obtain connector factory for {}", repository, e );
             }
         }
 
         StringBuilder buffer = new StringBuilder( 256 );
         if ( factories.isEmpty() )
         {
             buffer.append( "No connector factories available" );
         }
         else
         {
             buffer.append( "Cannot access " ).append( repository.getUrl() );
             buffer.append( " with type " ).append( repository.getContentType() );
             buffer.append( " using the available connector factories: " );
             factories.list( buffer );
         }
 
         throw new NoRepositoryConnectorException( repository, buffer.toString(), errors.size() == 1 ? errors.get( 0 )
                         : null );
     }
 
 }