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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.eclipse.aether.internal.transport.wagon;
20  
21  import javax.inject.Inject;
22  import javax.inject.Named;
23  import javax.inject.Singleton;
24  
25  import org.apache.maven.wagon.Wagon;
26  import org.codehaus.plexus.PlexusContainer;
27  import org.eclipse.aether.transport.wagon.WagonProvider;
28  
29  import static java.util.Objects.requireNonNull;
30  
31  /**
32   * A wagon provider backed by a Plexus container and the wagons registered with this container.
33   */
34  @Named("plexus")
35  @Singleton
36  public class PlexusWagonProvider implements WagonProvider {
37      private final PlexusContainer container;
38  
39      /**
40       * Creates a wagon provider using the specified Plexus container.
41       *
42       * @param container The Plexus container instance to use, must not be {@code null}.
43       */
44      @Inject
45      public PlexusWagonProvider(final PlexusContainer container) {
46          this.container = requireNonNull(container, "plexus container cannot be null");
47      }
48  
49      public Wagon lookup(String roleHint) throws Exception {
50          return container.lookup(Wagon.class, roleHint);
51      }
52  
53      public void release(Wagon wagon) {
54          try {
55              if (wagon != null) {
56                  container.release(wagon);
57              }
58          } catch (Exception e) {
59              // too bad
60          }
61      }
62  }