View Javadoc
1   package org.eclipse.aether.internal.transport.wagon;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   * 
12   *  http://www.apache.org/licenses/LICENSE-2.0
13   * 
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  import static java.util.Objects.requireNonNull;
23  
24  import org.apache.maven.wagon.Wagon;
25  import org.codehaus.plexus.PlexusContainer;
26  import org.codehaus.plexus.component.annotations.Component;
27  import org.codehaus.plexus.component.annotations.Requirement;
28  import org.eclipse.aether.transport.wagon.WagonProvider;
29  
30  /**
31   * A wagon provider backed by a Plexus container and the wagons registered with this container.
32   */
33  @Component( role = WagonProvider.class, hint = "plexus" )
34  public class PlexusWagonProvider
35      implements WagonProvider
36  {
37  
38      @Requirement
39      private PlexusContainer container;
40  
41      /**
42       * Creates an uninitialized wagon provider.
43       * 
44       * @noreference This constructor only supports the Plexus IoC container and should not be called directly by
45       *              clients.
46       */
47      public PlexusWagonProvider()
48      {
49          // enables no-arg constructor
50      }
51  
52      /**
53       * Creates a wagon provider using the specified Plexus container.
54       *
55       * @param container The Plexus container instance to use, must not be {@code null}.
56       */
57      public PlexusWagonProvider( PlexusContainer container )
58      {
59          this.container = requireNonNull( container, "plexus container cannot be null" );
60      }
61  
62      public Wagon lookup( String roleHint )
63          throws Exception
64      {
65          return container.lookup( Wagon.class, roleHint );
66      }
67  
68      public void release( Wagon wagon )
69      {
70          try
71          {
72              if ( wagon != null )
73              {
74                  container.release( wagon );
75              }
76          }
77          catch ( Exception e )
78          {
79              // too bad
80          }
81      }
82  
83  }