CircularDependencyError


1   /*
2    * Copyright 2003-2004 The Apache Software Foundation
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.apache.commons.attributes;
17  
18  import java.util.Iterator  ;
19  import java.util.List  ;
20  
21  /**
22   * Thrown when an attribute repository class can't be
23   * loaded because it resulted in a circular dependency.
24   */
25  public class CircularDependencyError extends RepositoryError {
26     
27      /**
28       * Create a new CircularDependencyError.
29       *
30       * @param className the name of the class that started it all.
31       * @param dependencyList a list of the classes that the original
32       *                       class depended on, the classes they
33       *                       depended on, and so on. The list should
34       *                       show the chain of dependencies that resulted
35       *                       in the exception being thrown.
36       */
37      public CircularDependencyError (String   className, List   dependencyList) {
38          super (className + ":" + listDeps (dependencyList), null);
39      }
40      
41      /**
42       * Joins together the elements of a list with <code>-&gt;</code>
43       * delimiters. Used to show the sequence that resulted in the circular
44       * dependency.
45       */
46      private static String   listDeps (List   dependencyList) {
47          StringBuffer   sb = new StringBuffer   ();
48          Iterator   iter = dependencyList.iterator ();
49          while (iter.hasNext ()) {
50              sb.append (iter.next ());
51              if (iter.hasNext ()) {
52                  sb.append (" -> ");
53              }
54          }
55          
56          return sb.toString ();
57      }
58  }
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