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1   package org.codehaus.plexus.util.dag;
2   
3   /*
4    * Copyright The Codehaus Foundation.
5    *
6    * Licensed under the Apache License, Version 2.0 (the "License");
7    * you may not use this file except in compliance with the License.
8    * 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, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  import java.util.Iterator;
20  import java.util.List;
21  
22  public class CycleDetectedException
23      extends Exception
24  {
25      private List<String> cycle;
26  
27      public CycleDetectedException( final String message, final List<String> cycle )
28      {
29          super( message );
30  
31          this.cycle = cycle;
32  
33      }
34  
35      public List<String> getCycle()
36      {
37          return cycle;
38      }
39  
40      /**
41       * @return
42       */
43      public String cycleToString()
44      {
45          final StringBuilder buffer = new StringBuilder();
46  
47          for ( Iterator<String> iterator = cycle.iterator(); iterator.hasNext(); )
48          {
49              buffer.append( iterator.next() );
50  
51              if ( iterator.hasNext() )
52              {
53                  buffer.append( " --> " );
54              }
55          }
56          return buffer.toString();
57      }
58  
59      public String getMessage()
60      {
61          return super.getMessage() + " " + cycleToString();
62      }
63  }