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1   package org.apache.maven.artifact.resolver;
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 java.util.ArrayList;
23  import java.util.Collection;
24  import java.util.List;
25  
26  import org.codehaus.plexus.component.annotations.Component;
27  
28  /**
29   * @author Benjamin Bentmann
30   */
31  @Component( role = ResolutionErrorHandler.class )
32  public class DefaultResolutionErrorHandler
33      implements ResolutionErrorHandler
34  {
35  
36      public void throwErrors( ArtifactResolutionRequest request, ArtifactResolutionResult result )
37          throws ArtifactResolutionException
38      {
39          // Metadata cannot be found
40  
41          if ( result.hasMetadataResolutionExceptions() )
42          {
43              throw result.getMetadataResolutionException( 0 );
44          }
45  
46          // Metadata cannot be retrieved
47  
48          // Cyclic Dependency Error
49  
50          if ( result.hasCircularDependencyExceptions() )
51          {
52              throw result.getCircularDependencyException( 0 );
53          }
54  
55          // Version Range Violation
56  
57          if ( result.hasVersionRangeViolations() )
58          {
59              throw result.getVersionRangeViolation( 0 );
60          }
61  
62          // Transfer Error
63  
64          if ( result.hasErrorArtifactExceptions() )
65          {
66              throw result.getErrorArtifactExceptions().get( 0 );
67          }
68  
69          if ( result.hasMissingArtifacts() )
70          {
71              throw new MultipleArtifactsNotFoundException( request.getArtifact(), toList( result.getArtifacts() ),
72                                                            result.getMissingArtifacts(),
73                                                            request.getRemoteRepositories() );
74          }
75  
76          // this should never happen since we checked all possible error sources before but better be sure
77          if ( result.hasExceptions() )
78          {
79              throw new ArtifactResolutionException( "Unknown error during artifact resolution, " + request + ", "
80                  + result.getExceptions(), request.getArtifact(), request.getRemoteRepositories() );
81          }
82      }
83  
84      private static <T> List<T> toList( Collection<T> items )
85      {
86          return ( items != null ) ? new ArrayList<>( items ) : null;
87      }
88  
89  }