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1   package org.apache.maven.usability;
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.artifact.manager.WagonManager;
23  import org.apache.maven.artifact.resolver.ArtifactResolutionException;
24  import org.apache.maven.usability.diagnostics.DiagnosisUtils;
25  import org.apache.maven.usability.diagnostics.ErrorDiagnoser;
26  
27  import java.io.IOException;
28  
29  public class ArtifactResolverDiagnoser
30      implements ErrorDiagnoser
31  {
32  
33      private WagonManager wagonManager;
34  
35      public boolean canDiagnose( Throwable error )
36      {
37          return DiagnosisUtils.containsInCausality( error, ArtifactResolutionException.class );
38      }
39  
40      public String diagnose( Throwable error )
41      {
42          ArtifactResolutionException exception =
43              (ArtifactResolutionException) DiagnosisUtils.getFromCausality( error, ArtifactResolutionException.class );
44  
45          StringBuffer message = new StringBuffer();
46  
47          message.append( "Failed to resolve artifact." );
48          message.append( "\n\n" );
49          message.append( exception.getMessage() );
50  
51          IOException ioe = (IOException) DiagnosisUtils.getFromCausality( exception, IOException.class );
52  
53          if ( ioe != null && ioe.getMessage() != null && exception.getMessage().indexOf( ioe.getMessage() ) < 0 )
54          {
55              message.append( "\n\nCaused by I/O exception: " ).append( ioe.getMessage() );
56          }
57  
58          if ( !wagonManager.isOnline() )
59          {
60              message.append( "\n" ).append( SystemWarnings.getOfflineWarning() );
61          }
62  
63          message.append( "\n" );
64  
65          return message.toString();
66      }
67  
68  }