package org.eclipse.aether.internal.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 static java.util.Objects.requireNonNull;
  
  import org.apache.maven.wagon.Wagon;
  import org.codehaus.plexus.PlexusContainer;
  import org.eclipse.aether.transport.wagon.WagonProvider;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  /**
   * A wagon provider backed by a Plexus container and the wagons registered with this container.
   */
  @Named( "plexus" )
  @Singleton
  public class PlexusWagonProvider
      implements WagonProvider
  {
      private final PlexusContainer container;
  
      /**
       * Creates a wagon provider using the specified Plexus container.
       *
       * @param container The Plexus container instance to use, must not be {@code null}.
       */
      @Inject
      public PlexusWagonProvider( final PlexusContainer container )
      {
          this.container = requireNonNull( container, "plexus container cannot be null" );
      }
  
      public Wagon lookup( String roleHint )
          throws Exception
      {
          return container.lookup( Wagon.class, roleHint );
      }
  
      public void release( Wagon wagon )
      {
          try
          {
              if ( wagon != null )
              {
                  container.release( wagon );
              }
          }
          catch ( Exception e )
          {
              // too bad
          }
      }
  
  }