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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.plugin.MojoFailureException;
23  import org.apache.maven.usability.diagnostics.DiagnosisUtils;
24  import org.apache.maven.usability.diagnostics.ErrorDiagnoser;
25  
26  public class MojoFailureExceptionDiagnoser
27      implements ErrorDiagnoser
28  {
29  
30      public boolean canDiagnose( Throwable error )
31      {
32          return DiagnosisUtils.containsInCausality( error, MojoFailureException.class );
33      }
34  
35      public String diagnose( Throwable error )
36      {
37          MojoFailureException mfe =
38              (MojoFailureException) DiagnosisUtils.getFromCausality( error, MojoFailureException.class );
39  
40          StringBuffer message = new StringBuffer();
41  
42          Object source = mfe.getSource();
43          if ( source != null )
44          {
45              message.append( ": " ).append( mfe.getSource() ).append( "\n" );
46          }
47  
48          String shortMessage = mfe.getMessage();
49          if ( shortMessage != null )
50          {
51              message.append( shortMessage );
52          }
53  
54          String longMessage = mfe.getLongMessage();
55          
56          // the indexOf bit is very strange, but the compiler output for 1.5 source compiled using JDK 1.4 presents this case!
57          if ( longMessage != null && !longMessage.equals( shortMessage ) && shortMessage.indexOf( longMessage ) < 0 )
58          {
59              message.append( "\n\n" ).append( longMessage );
60          }
61  
62          return message.toString();
63      }
64  
65  }