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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 org.apache.maven.wagon.Wagon;
23  import org.codehaus.plexus.PlexusContainer;
24  import org.codehaus.plexus.component.annotations.Component;
25  import org.codehaus.plexus.component.annotations.Requirement;
26  import org.eclipse.aether.transport.wagon.WagonProvider;
27  
28  /**
29   * A wagon provider backed by a Plexus container and the wagons registered with this container.
30   */
31  @Component( role = WagonProvider.class, hint = "plexus" )
32  public class PlexusWagonProvider
33      implements WagonProvider
34  {
35  
36      @Requirement
37      private PlexusContainer container;
38  
39      /**
40       * Creates an uninitialized wagon provider.
41       * 
42       * @noreference This constructor only supports the Plexus IoC container and should not be called directly by
43       *              clients.
44       */
45      public PlexusWagonProvider()
46      {
47          // enables no-arg constructor
48      }
49  
50      /**
51       * Creates a wagon provider using the specified Plexus container.
52       * 
53       * @param container The Plexus container instance to use, must not be {@code null}.
54       */
55      public PlexusWagonProvider( PlexusContainer container )
56      {
57          if ( container == null )
58          {
59              throw new IllegalArgumentException( "plexus container has not been specified" );
60          }
61          this.container = container;
62      }
63  
64      public Wagon lookup( String roleHint )
65          throws Exception
66      {
67          return container.lookup( Wagon.class, roleHint );
68      }
69  
70      public void release( Wagon wagon )
71      {
72          try
73          {
74              if ( wagon != null )
75              {
76                  container.release( wagon );
77              }
78          }
79          catch ( Exception e )
80          {
81              // too bad
82          }
83      }
84  
85  }